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[Bug]: Re-encoding doesn't appear to be working #3164

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opened 2026-04-25 00:14:01 +02:00 by adam · 5 comments
adam commented 2026-04-25 00:14:01 +02:00
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Originally created by @darkalchemy on GitHub (Dec 29, 2025).

What happened?

When I re-encode an m4b file to 64k from 128k, the metadata is updated, but the bitrate remains the same.

What did you expect to happen?

I would expect that the bitrate would be at 64k, not 128k as the original was.

Steps to reproduce the issue

  1. Select audiobook
  2. Click edit
  3. Goto Tools Tab
  4. Click Open Manager
  5. Select 64k
  6. Click Start M4B Encode
  7. Wait for encode to complete

Audiobookshelf version

v2.32.1

How are you running audiobookshelf?

Docker

What OS is your Audiobookshelf server hosted from?

Linux

If the issue is being seen in the UI, what browsers are you seeing the problem on?

Chrome

Logs

2025-12-29 10:06:50.816

INFO

[ToolsController] encodeM4b: Starting audiobook merge for "The Fellowship of the Ring" with options: {"codec":"copy","bitrate":"64k","channels":"2"}

2025-12-29 10:06:50.817

INFO

Start m4b encode for 8f191a01-d994-4b87-b2d4-e08a27faa8db - TaskId: b32c8a5d-cff8-4a9d-b0fa-edd09b59e8d8

2025-12-29 10:06:51.459

DEBUG

[ffmpegHelpers] Wrote /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/ffmetadata.txt

2025-12-29 10:06:51.462

DEBUG

[ffmpegHelpers] Merge Audio Files ffmpeg command: ffmpeg -f mp4 -i /Audiobooks/J. R. R. Tolkien/The Lord of the Rings/01. The Fellowship of the Ring {Andy Serkis}/01. The Fellowship of the Ring {Andy Serkis}.m4b -y -f mp4 -map 0:a -acodec copy -ac 2 -b:a 64k /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b

2025-12-29 10:07:10.325

DEBUG

[ffmpegHelpers] ffmpeg stdout:

2025-12-29 10:07:10.325

DEBUG

[ffmpegHelpers] ffmpeg stderr: title : Chapter 6: The Old Forest Chapter #0:11: start 23583.807000, end 25988.046000 Metadata: title : Chapter 7: In the House of Tom Bombadil Chapter #0:12: start 25988.046000, end 28921.678000 Metadata: title : Chapter 8: Fog on the Barrow-Downs Chapter #0:13: start 28921.678000, end 31266.522000 Metadata: title : Chapter 9: At the Sign of the Prancing Pony Chapter #0:14: start 31266.522000, end 33618.563000 Metadata: title : Chapter 10: Strider Chapter #0:15: start 33618.563000, end 37517.470000 Metadata: title : Chapter 11: A Knife in the Dark Chapter #0:16: start 37517.470000, end 41126.850000 Metadata: title : Chapter 12: Flight to the Ford Chapter #0:17: start 41126.850000, end 41129.803000 Metadata: title : Book Two Chapter #0:18: start 41129.803000, end 45179.219000 Metadata: title : Chapter 1: Many Meetings Chapter #0:19: start 45179.219000, end 52637.257000 Metadata: title : Chapter 2: The Council of Elrond Chapter #0:20: start 52637.257000, end 57257.864000 Metadata: title : Chapter 3: The Ring Goes South Chapter #0:21: start 57257.864000, end 62421.238000 Metadata: title : Chapter 4: A Journey in the Dark Chapter #0:22: start 62421.238000, end 64886.988000 Metadata: title : Chapter 5: The Bridge of Khazad-Dûm Chapter #0:23: start 64886.988000, end 69146.920000 Metadata: title : Chapter 6: Lothlórien Chapter #0:24: start 69146.920000, end 72434.633000 Metadata: title : Chapter 7: The Mirror of Galadriel Chapter #0:25: start 72434.633000, end 75558.994000 Metadata: title : Chapter 8: Farewell to Lórien Chapter #0:26: start 75558.994000, end 78679.732000 Metadata: title : Chapter 9: The Great River Chapter #0:27: start 78679.732000, end 81473.997000 Metadata: title : Chapter 10: The Breaking of the Fellowship Chapter #0:28: start 81473.997000, end 81500.694000 Metadata: title : End Credits Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 64 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] Press [q] to stop, [?] for help size= 35073KiB time=00:38:11.94 bitrate= 125.4kbits/s speed=4.58e+03x elapsed=0:00:00.50 size= 71937KiB time=01:18:23.57 bitrate= 125.3kbits/s speed=4.7e+03x elapsed=0:00:01.00 size= 110593KiB time=02:00:14.64 bitrate= 125.6kbits/s speed=4.81e+03x elapsed=0:00:01.50 size= 149249KiB time=02:42:28.38 bitrate= 125.4kbits/s speed=4.87e+03x elapsed=0:00:02.00 size= 184577KiB time=03:20:54.33 bitrate= 125.4kbits/s speed=4.82e+03x elapsed=0:00:02.50 size= 219137KiB time=03:58:22.86 bitrate= 125.5kbits/s speed=4.77e+03x elapsed=0:00:03.00 size= 255745KiB time=04:38:06.92 bitrate= 125.6kbits/s speed=4.77e+03x elapsed=0:00:03.50 size= 292865KiB time=05:18:39.61 bitrate= 125.5kbits/s speed=4.78e+03x elapsed=0:00:04.00 size= 330753KiB time=05:59:40.25 bitrate= 125.6kbits/s speed=4.79e+03x elapsed=0:00:04.50 size= 368129KiB time=06:40:20.92 bitrate= 125.5kbits/s speed=4.8e+03x elapsed=0:00:05.00 size= 403201KiB time=07:18:37.21 bitrate= 125.5kbits/s speed=4.78e+03x elapsed=0:00:05.50 size= 441089KiB time=07:59:32.28 bitrate= 125.6kbits/s speed=4.79e+03x elapsed=0:00:06.00 size= 480001KiB time=08:41:56.61 bitrate= 125.6kbits/s speed=4.82e+03x elapsed=0:00:06.50 size= 520961KiB time=09:26:38.35 bitrate= 125.5kbits/s speed=4.86e+03x elapsed=0:00:07.00 size= 557313KiB time=10:06:03.40 bitrate= 125.6kbits/s speed=4.85e+03x elapsed=0:00:07.50 size= 595713KiB time=10:47:52.59 bitrate= 125.5kbits/s speed=4.86e+03x elapsed=0:00:08.00 size= 633345KiB time=11:28:40.72 bitrate= 125.6kbits/s speed=4.86e+03x elapsed=0:00:08.50 size= 668929KiB time=12:07:30.17 bitrate= 125.5kbits/s speed=4.85e+03x elapsed=0:00:09.00 size= 700929KiB time=12:42:17.41 bitrate= 125.5kbits/s speed=4.81e+03x elapsed=0:00:09.50 size= 721153KiB time=13:04:05.50 bitrate= 125.6kbits/s speed=4.7e+03x elapsed=0:00:10.00 size= 753153KiB time=13:38:53.77 bitrate= 125.6kbits/s speed=4.68e+03x elapsed=0:00:10.50 size= 781057KiB time=14:09:21.87 bitrate= 125.6kbits/s speed=4.63e+03x elapsed=0:00:11.00 size= 816641KiB time=14:48:00.99 bitrate= 125.6kbits/s speed=4.63e+03x elapsed=0:00:11.50 size= 854017KiB time=15:28:32.84 bitrate= 125.6kbits/s speed=4.64e+03x elapsed=0:00:12.00 size= 892417KiB time=16:10:13.19 bitrate= 125.6kbits/s speed=4.66e+03x elapsed=0:00:12.50 size= 927745KiB time=16:48:51.98 bitrate= 125.6kbits/s speed=4.65e+03x elapsed=0:00:13.00 size= 964865KiB time=17:29:01.88 bitrate= 125.6kbits/s speed=4.66e+03x elapsed=0:00:13.50 size= 1001729KiB time=18:09:11.05 bitrate= 125.6kbits/s speed=4.67e+03x elapsed=0:00:14.00 size= 1034241KiB time=18:44:39.11 bitrate= 125.6kbits/s speed=4.65e+03x elapsed=0:00:14.50 size= 1064705KiB time=19:17:33.50 bitrate= 125.6kbits/s speed=4.63e+03x elapsed=0:00:15.00 size= 1094401KiB time=19:49:48.42 bitrate= 125.6kbits/s speed=4.6e+03x elapsed=0:00:15.50 size= 1124097KiB time=20:22:08.45 bitrate= 125.6kbits/s speed=4.58e+03x elapsed=0:00:16.00 size= 1149185KiB time=20:49:20.30 bitrate= 125.6kbits/s speed=4.54e+03x elapsed=0:00:16.50 size= 1178881KiB time=21:21:43.25 bitrate= 125.6kbits/s speed=4.52e+03x elapsed=0:00:17.00 size= 1207809KiB time=21:53:12.43 bitrate= 125.6kbits/s speed=4.5e+03x elapsed=0:00:17.50 size= 1237505KiB time=22:25:23.89 bitrate= 125.6kbits/s speed=4.48e+03x elapsed=0:00:18.00 [out#0/mp4 @ 0x7fceeaaf7640] video:0KiB audio:1249455KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 1.098383% size= 1263179KiB time=22:38:20.69 bitrate= 127.0kbits/s speed=4.43e+03x elapsed=0:00:18.38

2025-12-29 10:07:10.325

DEBUG

[ffmpegHelpers] Audio Files Merged Successfully

2025-12-29 10:07:10.328

DEBUG

[ffmpegHelpers] Spawned Ffmpeg with command: ffmpeg -i /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b -i /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/ffmetadata.txt -i /Audiobooks/J. R. R. Tolkien/The Lord of the Rings/01. The Fellowship of the Ring {Andy Serkis}/cover.jpg -y -map 0:a -map_metadata 1 -map_metadata 0 -map_chapters 1 -c copy -metadata track=1 -f mp4 -map 2:v -disposition:v:0 attached_pic -metadata:s:v title=Cover -metadata:s:v comment=Cover /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.tmp.m4b

2025-12-29 10:07:11.196

DEBUG

[ffmpegHelpers] Progress: 4.034591408043213%

2025-12-29 10:07:11.197

DEBUG

[AbMergeManager] Embedding metadata progress: 95.20172957040216

2025-12-29 10:07:11.696

DEBUG

[ffmpegHelpers] Progress: 7.6289779759407965%

2025-12-29 10:07:11.696

DEBUG

[AbMergeManager] Embedding metadata progress: 95.38144889879705

2025-12-29 10:07:12.196

DEBUG

[ffmpegHelpers] Progress: 11.327240959833947%

2025-12-29 10:07:12.196

DEBUG

[AbMergeManager] Embedding metadata progress: 95.5663620479917

2025-12-29 10:07:12.696

DEBUG

[ffmpegHelpers] Progress: 16.486105002091392%

2025-12-29 10:07:12.697

DEBUG

[AbMergeManager] Embedding metadata progress: 95.82430525010457

2025-12-29 10:07:13.196

DEBUG

[ffmpegHelpers] Progress: 21.859273967781213%

2025-12-29 10:07:13.196

DEBUG

[AbMergeManager] Embedding metadata progress: 96.09296369838906

2025-12-29 10:07:13.696

DEBUG

[ffmpegHelpers] Progress: 26.79485156800142%

2025-12-29 10:07:13.697

DEBUG

[AbMergeManager] Embedding metadata progress: 96.33974257840008

2025-12-29 10:07:14.196

DEBUG

[ffmpegHelpers] Progress: 32.22306300973142%

2025-12-29 10:07:14.197

DEBUG

[AbMergeManager] Embedding metadata progress: 96.61115315048657

2025-12-29 10:07:14.697

DEBUG

[ffmpegHelpers] Progress: 37.75101593334519%

2025-12-29 10:07:14.697

DEBUG

[AbMergeManager] Embedding metadata progress: 96.88755079666726

2025-12-29 10:07:15.197

DEBUG

[ffmpegHelpers] Progress: 42.90602724767649%

2025-12-29 10:07:15.197

DEBUG

[AbMergeManager] Embedding metadata progress: 97.14530136238383

2025-12-29 10:07:15.697

DEBUG

[ffmpegHelpers] Progress: 48.32537986914323%

2025-12-29 10:07:15.697

DEBUG

[AbMergeManager] Embedding metadata progress: 97.41626899345717

2025-12-29 10:07:16.197

DEBUG

[ffmpegHelpers] Progress: 52.36373811627345%

2025-12-29 10:07:16.197

DEBUG

[AbMergeManager] Embedding metadata progress: 97.61818690581367

2025-12-29 10:07:16.698

DEBUG

[ffmpegHelpers] Progress: 57.44299547450312%

2025-12-29 10:07:16.699

DEBUG

[AbMergeManager] Embedding metadata progress: 97.87214977372516

2025-12-29 10:07:17.197

DEBUG

[ffmpegHelpers] Progress: 61.26052124642803%

2025-12-29 10:07:17.197

DEBUG

[AbMergeManager] Embedding metadata progress: 98.0630260623214

2025-12-29 10:07:17.698

DEBUG

[ffmpegHelpers] Progress: 65.53611673703502%

2025-12-29 10:07:17.698

DEBUG

[AbMergeManager] Embedding metadata progress: 98.27680583685175

2025-12-29 10:07:18.198

DEBUG

[ffmpegHelpers] Progress: 70.2088744895556%

2025-12-29 10:07:18.198

DEBUG

[AbMergeManager] Embedding metadata progress: 98.51044372447778

2025-12-29 10:07:18.698

DEBUG

[ffmpegHelpers] Progress: 74.24703641933927%

2025-12-29 10:07:18.698

DEBUG

[AbMergeManager] Embedding metadata progress: 98.71235182096697

2025-12-29 10:07:19.198

DEBUG

[ffmpegHelpers] Progress: 79.45318840244798%

2025-12-29 10:07:19.199

DEBUG

[AbMergeManager] Embedding metadata progress: 98.9726594201224

2025-12-29 10:07:19.698

DEBUG

[ffmpegHelpers] Progress: 83.27062828553377%

2025-12-29 10:07:19.699

DEBUG

[AbMergeManager] Embedding metadata progress: 99.16353141427669

2025-12-29 10:07:20.199

DEBUG

[ffmpegHelpers] Progress: 88.61414106205973%

2025-12-29 10:07:20.199

DEBUG

[AbMergeManager] Embedding metadata progress: 99.43070705310299

2025-12-29 10:07:20.699

DEBUG

[ffmpegHelpers] Progress: 92.87141769026638%

2025-12-29 10:07:20.699

DEBUG

[AbMergeManager] Embedding metadata progress: 99.64357088451332

2025-12-29 10:07:21.199

DEBUG

[ffmpegHelpers] Progress: 96.86389902747368%

2025-12-29 10:07:21.199

DEBUG

[AbMergeManager] Embedding metadata progress: 99.84319495137369

2025-12-29 10:07:21.780

DEBUG

[ffmpegHelpers] Progress: 0.00004907933663858518%

2025-12-29 10:07:21.781

DEBUG

[AbMergeManager] Embedding metadata progress: 95.00000245396683

2025-12-29 10:07:21.794

DEBUG

[ffmpegHelpers] ffmpeg stdout:

2025-12-29 10:07:21.794

DEBUG

[ffmpegHelpers] ffmpeg stderr: Chapter #0:7: start 12777.452000, end 16730.810000 Metadata: title : Chapter 3: Three Is Company Chapter #0:8: start 16730.810000, end 18964.918000 Metadata: title : Chapter 4: A Short Cut to Mushrooms Chapter #0:9: start 18964.918000, end 20956.887000 Metadata: title : Chapter 5: A Conspiracy Unmasked Chapter #0:10: start 20956.887000, end 23583.807000 Metadata: title : Chapter 6: The Old Forest Chapter #0:11: start 23583.807000, end 25988.046000 Metadata: title : Chapter 7: In the House of Tom Bombadil Chapter #0:12: start 25988.046000, end 28921.678000 Metadata: title : Chapter 8: Fog on the Barrow-Downs Chapter #0:13: start 28921.678000, end 31266.522000 Metadata: title : Chapter 9: At the Sign of the Prancing Pony Chapter #0:14: start 31266.522000, end 33618.563000 Metadata: title : Chapter 10: Strider Chapter #0:15: start 33618.563000, end 37517.470000 Metadata: title : Chapter 11: A Knife in the Dark Chapter #0:16: start 37517.470000, end 41126.850000 Metadata: title : Chapter 12: Flight to the Ford Chapter #0:17: start 41126.850000, end 41129.803000 Metadata: title : Book Two Chapter #0:18: start 41129.803000, end 45179.219000 Metadata: title : Chapter 1: Many Meetings Chapter #0:19: start 45179.219000, end 52637.257000 Metadata: title : Chapter 2: The Council of Elrond Chapter #0:20: start 52637.257000, end 57257.864000 Metadata: title : Chapter 3: The Ring Goes South Chapter #0:21: start 57257.864000, end 62421.238000 Metadata: title : Chapter 4: A Journey in the Dark Chapter #0:22: start 62421.238000, end 64886.988000 Metadata: title : Chapter 5: The Bridge of Khazad-Dûm Chapter #0:23: start 64886.988000, end 69146.920000 Metadata: title : Chapter 6: Lothlórien Chapter #0:24: start 69146.920000, end 72434.633000 Metadata: title : Chapter 7: The Mirror of Galadriel Chapter #0:25: start 72434.633000, end 75558.994000 Metadata: title : Chapter 8: Farewell to Lórien Chapter #0:26: start 75558.994000, end 78679.732000 Metadata: title : Chapter 9: The Great River Chapter #0:27: start 78679.732000, end 81473.997000 Metadata: title : Chapter 10: The Breaking of the Fellowship Chapter #0:28: start 81473.997000, end 81500.694000 Metadata: title : End Credits Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] Stream #0:1: Video: mjpeg (Progressive) (mp4v / 0x7634706D), yuvj420p(pc, bt470bg/unknown/unknown), 2400x2400 [SAR 1:1 DAR 1:1], q=2-31, 25 fps, 25 tbr, 12800 tbn (attached pic) Metadata: title : Cover comment : Cover Press [q] to stop, [?] for help frame= 1 fps=0.0 q=-1.0 size= 50177KiB time=00:54:48.22 bitrate= 125.0kbits/s speed=6.57e+03x elapsed=0:00:00.50 frame= 1 fps=1.0 q=-1.0 size= 94977KiB time=01:43:37.67 bitrate= 125.1kbits/s speed=6.21e+03x elapsed=0:00:01.00 frame= 1 fps=0.7 q=-1.0 size= 141313KiB time=02:33:51.78 bitrate= 125.4kbits/s speed=6.15e+03x elapsed=0:00:01.50 frame= 1 fps=0.5 q=-1.0 size= 205825KiB time=03:43:56.29 bitrate= 125.5kbits/s speed=6.72e+03x elapsed=0:00:02.00 frame= 1 fps=0.4 q=-1.0 size= 272897KiB time=04:56:55.46 bitrate= 125.5kbits/s speed=7.12e+03x elapsed=0:00:02.50 frame= 1 fps=0.3 q=-1.0 size= 334593KiB time=06:03:57.99 bitrate= 125.5kbits/s speed=7.28e+03x elapsed=0:00:03.00 frame= 1 fps=0.3 q=-1.0 size= 402433KiB time=07:17:42.02 bitrate= 125.5kbits/s speed=7.5e+03x elapsed=0:00:03.50 frame= 1 fps=0.2 q=-1.0 size= 471297KiB time=08:32:47.34 bitrate= 125.5kbits/s speed=7.69e+03x elapsed=0:00:04.00 frame= 1 fps=0.2 q=-1.0 size= 535809KiB time=09:42:48.71 bitrate= 125.5kbits/s speed=7.77e+03x elapsed=0:00:04.50 frame= 1 fps=0.2 q=-1.0 size= 603393KiB time=10:56:25.52 bitrate= 125.5kbits/s speed=7.87e+03x elapsed=0:00:05.00 frame= 1 fps=0.2 q=-1.0 size= 654081KiB time=11:51:16.81 bitrate= 125.6kbits/s speed=7.76e+03x elapsed=0:00:05.50 frame= 1 fps=0.2 q=-1.0 size= 717569KiB time=13:00:16.44 bitrate= 125.6kbits/s speed=7.8e+03x elapsed=0:00:06.00 frame= 1 fps=0.2 q=-1.0 size= 765185KiB time=13:52:07.75 bitrate= 125.5kbits/s speed=7.68e+03x elapsed=0:00:06.50 frame= 1 fps=0.1 q=-1.0 size= 818433KiB time=14:50:12.39 bitrate= 125.5kbits/s speed=7.63e+03x elapsed=0:00:07.00 frame= 1 fps=0.1 q=-1.0 size= 877057KiB time=15:53:40.72 bitrate= 125.6kbits/s speed=7.63e+03x elapsed=0:00:07.50 frame= 1 fps=0.1 q=-1.0 size= 927489KiB time=16:48:31.85 bitrate= 125.6kbits/s speed=7.56e+03x elapsed=0:00:08.00 frame= 1 fps=0.1 q=-1.0 size= 992513KiB time=17:59:14.90 bitrate= 125.6kbits/s speed=7.62e+03x elapsed=0:00:08.50 frame= 1 fps=0.1 q=-1.0 size= 1040129KiB time=18:51:06.14 bitrate= 125.6kbits/s speed=7.54e+03x elapsed=0:00:09.00 frame= 1 fps=0.1 q=-1.0 size= 1106945KiB time=20:03:41.14 bitrate= 125.6kbits/s speed=7.6e+03x elapsed=0:00:09.50 frame= 1 fps=0.1 q=-1.0 size= 1160193KiB time=21:01:30.85 bitrate= 125.6kbits/s speed=7.57e+03x elapsed=0:00:10.00 frame= 1 fps=0.1 q=-1.0 size= 1210113KiB time=21:55:44.75 bitrate= 125.6kbits/s speed=7.52e+03x elapsed=0:00:10.50 [out#0/mp4 @ 0x7ff2d7b185c0] video:326KiB audio:1249455KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 1.098099% frame= 1 fps=0.1 q=-1.0 Lsize= 1263505KiB time=00:00:00.04 bitrate=258765756.8kbits/s speed=0.00361x elapsed=0:00:11.08

2025-12-29 10:07:21.794

DEBUG

[ffmpegHelpers] Moving temp file to audio file path: "/metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.tmp.m4b" -> "/metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b"

2025-12-29 10:07:26.534

DEBUG

[copyToExisting] Successfully copied file from /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.tmp.m4b to /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b

2025-12-29 10:07:26.757

DEBUG

[AbMergeManager] Backing up original track "/Audiobooks/J. R. R. Tolkien/The Lord of the Rings/01. The Fellowship of the Ring {Andy Serkis}/01. The Fellowship of the Ring {Andy Serkis}.m4b" to /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.backup.m4b

2025-12-29 10:07:38.871

DEBUG

[AbMergeManager] Moving m4b from /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b to /Audiobooks/J. R. R. Tolkien/The Lord of the Rings/01. The Fellowship of the Ring {Andy Serkis}/01. The Fellowship of the Ring {Andy Serkis}.m4b

2025-12-29 10:07:53.224

DEBUG

[copyToExisting] Successfully copied file from /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b to /Audiobooks/J. R. R. Tolkien/The Lord of the Rings/01. The Fellowship of the Ring {Andy Serkis}/01. The Fellowship of the Ring {Andy Serkis}.m4b

2025-12-29 10:07:53.358

INFO

[AbMergeManager] Removing task b32c8a5d-cff8-4a9d-b0fa-edd09b59e8d8

2025-12-29 10:07:53.360

INFO

[AbMergeManager] Ab task finished b32c8a5d-cff8-4a9d-b0fa-edd09b59e8d8

Additional Notes

No response

Originally created by @darkalchemy on GitHub (Dec 29, 2025). ### What happened? When I re-encode an m4b file to 64k from 128k, the metadata is updated, but the bitrate remains the same. ### What did you expect to happen? I would expect that the bitrate would be at 64k, not 128k as the original was. ### Steps to reproduce the issue 1. Select audiobook 2. Click edit 3. Goto Tools Tab 4. Click Open Manager 5. Select 64k 6. Click Start M4B Encode 7. Wait for encode to complete ### Audiobookshelf version v2.32.1 ### How are you running audiobookshelf? Docker ### What OS is your Audiobookshelf server hosted from? Linux ### If the issue is being seen in the UI, what browsers are you seeing the problem on? Chrome ### Logs ```shell 2025-12-29 10:06:50.816 INFO [ToolsController] encodeM4b: Starting audiobook merge for "The Fellowship of the Ring" with options: {"codec":"copy","bitrate":"64k","channels":"2"} 2025-12-29 10:06:50.817 INFO Start m4b encode for 8f191a01-d994-4b87-b2d4-e08a27faa8db - TaskId: b32c8a5d-cff8-4a9d-b0fa-edd09b59e8d8 2025-12-29 10:06:51.459 DEBUG [ffmpegHelpers] Wrote /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/ffmetadata.txt 2025-12-29 10:06:51.462 DEBUG [ffmpegHelpers] Merge Audio Files ffmpeg command: ffmpeg -f mp4 -i /Audiobooks/J. R. R. Tolkien/The Lord of the Rings/01. The Fellowship of the Ring {Andy Serkis}/01. The Fellowship of the Ring {Andy Serkis}.m4b -y -f mp4 -map 0:a -acodec copy -ac 2 -b:a 64k /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b 2025-12-29 10:07:10.325 DEBUG [ffmpegHelpers] ffmpeg stdout: 2025-12-29 10:07:10.325 DEBUG [ffmpegHelpers] ffmpeg stderr: title : Chapter 6: The Old Forest Chapter #0:11: start 23583.807000, end 25988.046000 Metadata: title : Chapter 7: In the House of Tom Bombadil Chapter #0:12: start 25988.046000, end 28921.678000 Metadata: title : Chapter 8: Fog on the Barrow-Downs Chapter #0:13: start 28921.678000, end 31266.522000 Metadata: title : Chapter 9: At the Sign of the Prancing Pony Chapter #0:14: start 31266.522000, end 33618.563000 Metadata: title : Chapter 10: Strider Chapter #0:15: start 33618.563000, end 37517.470000 Metadata: title : Chapter 11: A Knife in the Dark Chapter #0:16: start 37517.470000, end 41126.850000 Metadata: title : Chapter 12: Flight to the Ford Chapter #0:17: start 41126.850000, end 41129.803000 Metadata: title : Book Two Chapter #0:18: start 41129.803000, end 45179.219000 Metadata: title : Chapter 1: Many Meetings Chapter #0:19: start 45179.219000, end 52637.257000 Metadata: title : Chapter 2: The Council of Elrond Chapter #0:20: start 52637.257000, end 57257.864000 Metadata: title : Chapter 3: The Ring Goes South Chapter #0:21: start 57257.864000, end 62421.238000 Metadata: title : Chapter 4: A Journey in the Dark Chapter #0:22: start 62421.238000, end 64886.988000 Metadata: title : Chapter 5: The Bridge of Khazad-Dûm Chapter #0:23: start 64886.988000, end 69146.920000 Metadata: title : Chapter 6: Lothlórien Chapter #0:24: start 69146.920000, end 72434.633000 Metadata: title : Chapter 7: The Mirror of Galadriel Chapter #0:25: start 72434.633000, end 75558.994000 Metadata: title : Chapter 8: Farewell to Lórien Chapter #0:26: start 75558.994000, end 78679.732000 Metadata: title : Chapter 9: The Great River Chapter #0:27: start 78679.732000, end 81473.997000 Metadata: title : Chapter 10: The Breaking of the Fellowship Chapter #0:28: start 81473.997000, end 81500.694000 Metadata: title : End Credits Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 64 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] Press [q] to stop, [?] for help size= 35073KiB time=00:38:11.94 bitrate= 125.4kbits/s speed=4.58e+03x elapsed=0:00:00.50 size= 71937KiB time=01:18:23.57 bitrate= 125.3kbits/s speed=4.7e+03x elapsed=0:00:01.00 size= 110593KiB time=02:00:14.64 bitrate= 125.6kbits/s speed=4.81e+03x elapsed=0:00:01.50 size= 149249KiB time=02:42:28.38 bitrate= 125.4kbits/s speed=4.87e+03x elapsed=0:00:02.00 size= 184577KiB time=03:20:54.33 bitrate= 125.4kbits/s speed=4.82e+03x elapsed=0:00:02.50 size= 219137KiB time=03:58:22.86 bitrate= 125.5kbits/s speed=4.77e+03x elapsed=0:00:03.00 size= 255745KiB time=04:38:06.92 bitrate= 125.6kbits/s speed=4.77e+03x elapsed=0:00:03.50 size= 292865KiB time=05:18:39.61 bitrate= 125.5kbits/s speed=4.78e+03x elapsed=0:00:04.00 size= 330753KiB time=05:59:40.25 bitrate= 125.6kbits/s speed=4.79e+03x elapsed=0:00:04.50 size= 368129KiB time=06:40:20.92 bitrate= 125.5kbits/s speed=4.8e+03x elapsed=0:00:05.00 size= 403201KiB time=07:18:37.21 bitrate= 125.5kbits/s speed=4.78e+03x elapsed=0:00:05.50 size= 441089KiB time=07:59:32.28 bitrate= 125.6kbits/s speed=4.79e+03x elapsed=0:00:06.00 size= 480001KiB time=08:41:56.61 bitrate= 125.6kbits/s speed=4.82e+03x elapsed=0:00:06.50 size= 520961KiB time=09:26:38.35 bitrate= 125.5kbits/s speed=4.86e+03x elapsed=0:00:07.00 size= 557313KiB time=10:06:03.40 bitrate= 125.6kbits/s speed=4.85e+03x elapsed=0:00:07.50 size= 595713KiB time=10:47:52.59 bitrate= 125.5kbits/s speed=4.86e+03x elapsed=0:00:08.00 size= 633345KiB time=11:28:40.72 bitrate= 125.6kbits/s speed=4.86e+03x elapsed=0:00:08.50 size= 668929KiB time=12:07:30.17 bitrate= 125.5kbits/s speed=4.85e+03x elapsed=0:00:09.00 size= 700929KiB time=12:42:17.41 bitrate= 125.5kbits/s speed=4.81e+03x elapsed=0:00:09.50 size= 721153KiB time=13:04:05.50 bitrate= 125.6kbits/s speed=4.7e+03x elapsed=0:00:10.00 size= 753153KiB time=13:38:53.77 bitrate= 125.6kbits/s speed=4.68e+03x elapsed=0:00:10.50 size= 781057KiB time=14:09:21.87 bitrate= 125.6kbits/s speed=4.63e+03x elapsed=0:00:11.00 size= 816641KiB time=14:48:00.99 bitrate= 125.6kbits/s speed=4.63e+03x elapsed=0:00:11.50 size= 854017KiB time=15:28:32.84 bitrate= 125.6kbits/s speed=4.64e+03x elapsed=0:00:12.00 size= 892417KiB time=16:10:13.19 bitrate= 125.6kbits/s speed=4.66e+03x elapsed=0:00:12.50 size= 927745KiB time=16:48:51.98 bitrate= 125.6kbits/s speed=4.65e+03x elapsed=0:00:13.00 size= 964865KiB time=17:29:01.88 bitrate= 125.6kbits/s speed=4.66e+03x elapsed=0:00:13.50 size= 1001729KiB time=18:09:11.05 bitrate= 125.6kbits/s speed=4.67e+03x elapsed=0:00:14.00 size= 1034241KiB time=18:44:39.11 bitrate= 125.6kbits/s speed=4.65e+03x elapsed=0:00:14.50 size= 1064705KiB time=19:17:33.50 bitrate= 125.6kbits/s speed=4.63e+03x elapsed=0:00:15.00 size= 1094401KiB time=19:49:48.42 bitrate= 125.6kbits/s speed=4.6e+03x elapsed=0:00:15.50 size= 1124097KiB time=20:22:08.45 bitrate= 125.6kbits/s speed=4.58e+03x elapsed=0:00:16.00 size= 1149185KiB time=20:49:20.30 bitrate= 125.6kbits/s speed=4.54e+03x elapsed=0:00:16.50 size= 1178881KiB time=21:21:43.25 bitrate= 125.6kbits/s speed=4.52e+03x elapsed=0:00:17.00 size= 1207809KiB time=21:53:12.43 bitrate= 125.6kbits/s speed=4.5e+03x elapsed=0:00:17.50 size= 1237505KiB time=22:25:23.89 bitrate= 125.6kbits/s speed=4.48e+03x elapsed=0:00:18.00 [out#0/mp4 @ 0x7fceeaaf7640] video:0KiB audio:1249455KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 1.098383% size= 1263179KiB time=22:38:20.69 bitrate= 127.0kbits/s speed=4.43e+03x elapsed=0:00:18.38 2025-12-29 10:07:10.325 DEBUG [ffmpegHelpers] Audio Files Merged Successfully 2025-12-29 10:07:10.328 DEBUG [ffmpegHelpers] Spawned Ffmpeg with command: ffmpeg -i /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b -i /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/ffmetadata.txt -i /Audiobooks/J. R. R. Tolkien/The Lord of the Rings/01. The Fellowship of the Ring {Andy Serkis}/cover.jpg -y -map 0:a -map_metadata 1 -map_metadata 0 -map_chapters 1 -c copy -metadata track=1 -f mp4 -map 2:v -disposition:v:0 attached_pic -metadata:s:v title=Cover -metadata:s:v comment=Cover /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.tmp.m4b 2025-12-29 10:07:11.196 DEBUG [ffmpegHelpers] Progress: 4.034591408043213% 2025-12-29 10:07:11.197 DEBUG [AbMergeManager] Embedding metadata progress: 95.20172957040216 2025-12-29 10:07:11.696 DEBUG [ffmpegHelpers] Progress: 7.6289779759407965% 2025-12-29 10:07:11.696 DEBUG [AbMergeManager] Embedding metadata progress: 95.38144889879705 2025-12-29 10:07:12.196 DEBUG [ffmpegHelpers] Progress: 11.327240959833947% 2025-12-29 10:07:12.196 DEBUG [AbMergeManager] Embedding metadata progress: 95.5663620479917 2025-12-29 10:07:12.696 DEBUG [ffmpegHelpers] Progress: 16.486105002091392% 2025-12-29 10:07:12.697 DEBUG [AbMergeManager] Embedding metadata progress: 95.82430525010457 2025-12-29 10:07:13.196 DEBUG [ffmpegHelpers] Progress: 21.859273967781213% 2025-12-29 10:07:13.196 DEBUG [AbMergeManager] Embedding metadata progress: 96.09296369838906 2025-12-29 10:07:13.696 DEBUG [ffmpegHelpers] Progress: 26.79485156800142% 2025-12-29 10:07:13.697 DEBUG [AbMergeManager] Embedding metadata progress: 96.33974257840008 2025-12-29 10:07:14.196 DEBUG [ffmpegHelpers] Progress: 32.22306300973142% 2025-12-29 10:07:14.197 DEBUG [AbMergeManager] Embedding metadata progress: 96.61115315048657 2025-12-29 10:07:14.697 DEBUG [ffmpegHelpers] Progress: 37.75101593334519% 2025-12-29 10:07:14.697 DEBUG [AbMergeManager] Embedding metadata progress: 96.88755079666726 2025-12-29 10:07:15.197 DEBUG [ffmpegHelpers] Progress: 42.90602724767649% 2025-12-29 10:07:15.197 DEBUG [AbMergeManager] Embedding metadata progress: 97.14530136238383 2025-12-29 10:07:15.697 DEBUG [ffmpegHelpers] Progress: 48.32537986914323% 2025-12-29 10:07:15.697 DEBUG [AbMergeManager] Embedding metadata progress: 97.41626899345717 2025-12-29 10:07:16.197 DEBUG [ffmpegHelpers] Progress: 52.36373811627345% 2025-12-29 10:07:16.197 DEBUG [AbMergeManager] Embedding metadata progress: 97.61818690581367 2025-12-29 10:07:16.698 DEBUG [ffmpegHelpers] Progress: 57.44299547450312% 2025-12-29 10:07:16.699 DEBUG [AbMergeManager] Embedding metadata progress: 97.87214977372516 2025-12-29 10:07:17.197 DEBUG [ffmpegHelpers] Progress: 61.26052124642803% 2025-12-29 10:07:17.197 DEBUG [AbMergeManager] Embedding metadata progress: 98.0630260623214 2025-12-29 10:07:17.698 DEBUG [ffmpegHelpers] Progress: 65.53611673703502% 2025-12-29 10:07:17.698 DEBUG [AbMergeManager] Embedding metadata progress: 98.27680583685175 2025-12-29 10:07:18.198 DEBUG [ffmpegHelpers] Progress: 70.2088744895556% 2025-12-29 10:07:18.198 DEBUG [AbMergeManager] Embedding metadata progress: 98.51044372447778 2025-12-29 10:07:18.698 DEBUG [ffmpegHelpers] Progress: 74.24703641933927% 2025-12-29 10:07:18.698 DEBUG [AbMergeManager] Embedding metadata progress: 98.71235182096697 2025-12-29 10:07:19.198 DEBUG [ffmpegHelpers] Progress: 79.45318840244798% 2025-12-29 10:07:19.199 DEBUG [AbMergeManager] Embedding metadata progress: 98.9726594201224 2025-12-29 10:07:19.698 DEBUG [ffmpegHelpers] Progress: 83.27062828553377% 2025-12-29 10:07:19.699 DEBUG [AbMergeManager] Embedding metadata progress: 99.16353141427669 2025-12-29 10:07:20.199 DEBUG [ffmpegHelpers] Progress: 88.61414106205973% 2025-12-29 10:07:20.199 DEBUG [AbMergeManager] Embedding metadata progress: 99.43070705310299 2025-12-29 10:07:20.699 DEBUG [ffmpegHelpers] Progress: 92.87141769026638% 2025-12-29 10:07:20.699 DEBUG [AbMergeManager] Embedding metadata progress: 99.64357088451332 2025-12-29 10:07:21.199 DEBUG [ffmpegHelpers] Progress: 96.86389902747368% 2025-12-29 10:07:21.199 DEBUG [AbMergeManager] Embedding metadata progress: 99.84319495137369 2025-12-29 10:07:21.780 DEBUG [ffmpegHelpers] Progress: 0.00004907933663858518% 2025-12-29 10:07:21.781 DEBUG [AbMergeManager] Embedding metadata progress: 95.00000245396683 2025-12-29 10:07:21.794 DEBUG [ffmpegHelpers] ffmpeg stdout: 2025-12-29 10:07:21.794 DEBUG [ffmpegHelpers] ffmpeg stderr: Chapter #0:7: start 12777.452000, end 16730.810000 Metadata: title : Chapter 3: Three Is Company Chapter #0:8: start 16730.810000, end 18964.918000 Metadata: title : Chapter 4: A Short Cut to Mushrooms Chapter #0:9: start 18964.918000, end 20956.887000 Metadata: title : Chapter 5: A Conspiracy Unmasked Chapter #0:10: start 20956.887000, end 23583.807000 Metadata: title : Chapter 6: The Old Forest Chapter #0:11: start 23583.807000, end 25988.046000 Metadata: title : Chapter 7: In the House of Tom Bombadil Chapter #0:12: start 25988.046000, end 28921.678000 Metadata: title : Chapter 8: Fog on the Barrow-Downs Chapter #0:13: start 28921.678000, end 31266.522000 Metadata: title : Chapter 9: At the Sign of the Prancing Pony Chapter #0:14: start 31266.522000, end 33618.563000 Metadata: title : Chapter 10: Strider Chapter #0:15: start 33618.563000, end 37517.470000 Metadata: title : Chapter 11: A Knife in the Dark Chapter #0:16: start 37517.470000, end 41126.850000 Metadata: title : Chapter 12: Flight to the Ford Chapter #0:17: start 41126.850000, end 41129.803000 Metadata: title : Book Two Chapter #0:18: start 41129.803000, end 45179.219000 Metadata: title : Chapter 1: Many Meetings Chapter #0:19: start 45179.219000, end 52637.257000 Metadata: title : Chapter 2: The Council of Elrond Chapter #0:20: start 52637.257000, end 57257.864000 Metadata: title : Chapter 3: The Ring Goes South Chapter #0:21: start 57257.864000, end 62421.238000 Metadata: title : Chapter 4: A Journey in the Dark Chapter #0:22: start 62421.238000, end 64886.988000 Metadata: title : Chapter 5: The Bridge of Khazad-Dûm Chapter #0:23: start 64886.988000, end 69146.920000 Metadata: title : Chapter 6: Lothlórien Chapter #0:24: start 69146.920000, end 72434.633000 Metadata: title : Chapter 7: The Mirror of Galadriel Chapter #0:25: start 72434.633000, end 75558.994000 Metadata: title : Chapter 8: Farewell to Lórien Chapter #0:26: start 75558.994000, end 78679.732000 Metadata: title : Chapter 9: The Great River Chapter #0:27: start 78679.732000, end 81473.997000 Metadata: title : Chapter 10: The Breaking of the Fellowship Chapter #0:28: start 81473.997000, end 81500.694000 Metadata: title : End Credits Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] Stream #0:1: Video: mjpeg (Progressive) (mp4v / 0x7634706D), yuvj420p(pc, bt470bg/unknown/unknown), 2400x2400 [SAR 1:1 DAR 1:1], q=2-31, 25 fps, 25 tbr, 12800 tbn (attached pic) Metadata: title : Cover comment : Cover Press [q] to stop, [?] for help frame= 1 fps=0.0 q=-1.0 size= 50177KiB time=00:54:48.22 bitrate= 125.0kbits/s speed=6.57e+03x elapsed=0:00:00.50 frame= 1 fps=1.0 q=-1.0 size= 94977KiB time=01:43:37.67 bitrate= 125.1kbits/s speed=6.21e+03x elapsed=0:00:01.00 frame= 1 fps=0.7 q=-1.0 size= 141313KiB time=02:33:51.78 bitrate= 125.4kbits/s speed=6.15e+03x elapsed=0:00:01.50 frame= 1 fps=0.5 q=-1.0 size= 205825KiB time=03:43:56.29 bitrate= 125.5kbits/s speed=6.72e+03x elapsed=0:00:02.00 frame= 1 fps=0.4 q=-1.0 size= 272897KiB time=04:56:55.46 bitrate= 125.5kbits/s speed=7.12e+03x elapsed=0:00:02.50 frame= 1 fps=0.3 q=-1.0 size= 334593KiB time=06:03:57.99 bitrate= 125.5kbits/s speed=7.28e+03x elapsed=0:00:03.00 frame= 1 fps=0.3 q=-1.0 size= 402433KiB time=07:17:42.02 bitrate= 125.5kbits/s speed=7.5e+03x elapsed=0:00:03.50 frame= 1 fps=0.2 q=-1.0 size= 471297KiB time=08:32:47.34 bitrate= 125.5kbits/s speed=7.69e+03x elapsed=0:00:04.00 frame= 1 fps=0.2 q=-1.0 size= 535809KiB time=09:42:48.71 bitrate= 125.5kbits/s speed=7.77e+03x elapsed=0:00:04.50 frame= 1 fps=0.2 q=-1.0 size= 603393KiB time=10:56:25.52 bitrate= 125.5kbits/s speed=7.87e+03x elapsed=0:00:05.00 frame= 1 fps=0.2 q=-1.0 size= 654081KiB time=11:51:16.81 bitrate= 125.6kbits/s speed=7.76e+03x elapsed=0:00:05.50 frame= 1 fps=0.2 q=-1.0 size= 717569KiB time=13:00:16.44 bitrate= 125.6kbits/s speed=7.8e+03x elapsed=0:00:06.00 frame= 1 fps=0.2 q=-1.0 size= 765185KiB time=13:52:07.75 bitrate= 125.5kbits/s speed=7.68e+03x elapsed=0:00:06.50 frame= 1 fps=0.1 q=-1.0 size= 818433KiB time=14:50:12.39 bitrate= 125.5kbits/s speed=7.63e+03x elapsed=0:00:07.00 frame= 1 fps=0.1 q=-1.0 size= 877057KiB time=15:53:40.72 bitrate= 125.6kbits/s speed=7.63e+03x elapsed=0:00:07.50 frame= 1 fps=0.1 q=-1.0 size= 927489KiB time=16:48:31.85 bitrate= 125.6kbits/s speed=7.56e+03x elapsed=0:00:08.00 frame= 1 fps=0.1 q=-1.0 size= 992513KiB time=17:59:14.90 bitrate= 125.6kbits/s speed=7.62e+03x elapsed=0:00:08.50 frame= 1 fps=0.1 q=-1.0 size= 1040129KiB time=18:51:06.14 bitrate= 125.6kbits/s speed=7.54e+03x elapsed=0:00:09.00 frame= 1 fps=0.1 q=-1.0 size= 1106945KiB time=20:03:41.14 bitrate= 125.6kbits/s speed=7.6e+03x elapsed=0:00:09.50 frame= 1 fps=0.1 q=-1.0 size= 1160193KiB time=21:01:30.85 bitrate= 125.6kbits/s speed=7.57e+03x elapsed=0:00:10.00 frame= 1 fps=0.1 q=-1.0 size= 1210113KiB time=21:55:44.75 bitrate= 125.6kbits/s speed=7.52e+03x elapsed=0:00:10.50 [out#0/mp4 @ 0x7ff2d7b185c0] video:326KiB audio:1249455KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 1.098099% frame= 1 fps=0.1 q=-1.0 Lsize= 1263505KiB time=00:00:00.04 bitrate=258765756.8kbits/s speed=0.00361x elapsed=0:00:11.08 2025-12-29 10:07:21.794 DEBUG [ffmpegHelpers] Moving temp file to audio file path: "/metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.tmp.m4b" -> "/metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b" 2025-12-29 10:07:26.534 DEBUG [copyToExisting] Successfully copied file from /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.tmp.m4b to /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b 2025-12-29 10:07:26.757 DEBUG [AbMergeManager] Backing up original track "/Audiobooks/J. R. R. Tolkien/The Lord of the Rings/01. The Fellowship of the Ring {Andy Serkis}/01. The Fellowship of the Ring {Andy Serkis}.m4b" to /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.backup.m4b 2025-12-29 10:07:38.871 DEBUG [AbMergeManager] Moving m4b from /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b to /Audiobooks/J. R. R. Tolkien/The Lord of the Rings/01. The Fellowship of the Ring {Andy Serkis}/01. The Fellowship of the Ring {Andy Serkis}.m4b 2025-12-29 10:07:53.224 DEBUG [copyToExisting] Successfully copied file from /metadata/cache/items/8f191a01-d994-4b87-b2d4-e08a27faa8db/01. The Fellowship of the Ring {Andy Serkis}.m4b to /Audiobooks/J. R. R. Tolkien/The Lord of the Rings/01. The Fellowship of the Ring {Andy Serkis}/01. The Fellowship of the Ring {Andy Serkis}.m4b 2025-12-29 10:07:53.358 INFO [AbMergeManager] Removing task b32c8a5d-cff8-4a9d-b0fa-edd09b59e8d8 2025-12-29 10:07:53.360 INFO [AbMergeManager] Ab task finished b32c8a5d-cff8-4a9d-b0fa-edd09b59e8d8 ``` ### Additional Notes _No response_
adam added the bug label 2026-04-25 00:14:01 +02:00
adam closed this issue 2026-04-25 00:14:01 +02:00
adam commented 2026-04-25 00:14:02 +02:00
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@Vito0912 commented on GitHub (Dec 29, 2025):

Please provide logs from the time you start the encoding

@Vito0912 commented on GitHub (Dec 29, 2025): Please provide logs from the time you start the encoding
adam commented 2026-04-25 00:14:02 +02:00
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@darkalchemy commented on GitHub (Dec 29, 2025):

logs added

@darkalchemy commented on GitHub (Dec 29, 2025): logs added
adam commented 2026-04-25 00:14:02 +02:00
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@Vito0912 commented on GitHub (Dec 29, 2025):

This is not a bug. You cannot change the bitrate with a copy codec as you do not reencode it

@Vito0912 commented on GitHub (Dec 29, 2025): This is not a bug. You cannot change the bitrate with a copy codec as you do not reencode it
adam commented 2026-04-25 00:14:02 +02:00
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@darkalchemy commented on GitHub (Dec 29, 2025):

Then how do I change the bitrate? So, I need to set AAC, even if it's already AAC? A note indicating that the bitrate won't change if codec set to copy, would be helpful.

Thanks for the info.

@darkalchemy commented on GitHub (Dec 29, 2025): Then how do I change the bitrate? So, I need to set AAC, even if it's already AAC? A note indicating that the bitrate won't change if codec set to copy, would be helpful. Thanks for the info.
adam commented 2026-04-25 00:14:02 +02:00
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@Vito0912 commented on GitHub (Dec 29, 2025):

Then how do I change the bitrate? So, I need to set AAC, even if it's already AAC? A note indicating that the bitrate won't change if codec set to copy, would be helpful.

Yes. You need to set it to either aac or opus (depending what codec the file consists of) to actually reencode it and change bitrates

@Vito0912 commented on GitHub (Dec 29, 2025): > Then how do I change the bitrate? So, I need to set AAC, even if it's already AAC? A note indicating that the bitrate won't change if codec set to copy, would be helpful. Yes. You need to set it to either aac or opus (depending what codec the file consists of) to actually reencode it and change bitrates
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Reference: starred/audiobookshelf#3164
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