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[Bug]: Slow buffer On big books #3037
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adam (Adam Melkus)
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Reference: starred/audiobookshelf#3037
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Originally created by @mattr254 on GitHub (Oct 16, 2025).
What happened?
Books that are 10-20 hrs pull very quickly, books that are 50 hrs plus (yes there's a few out there) take 10-15 minutes to pull on the same connection. Running ADSL with a 5 MBps upload and have no issues with standard novels but I'm guessing since the book is longer and larger it buffers off percentage size vs time. Any option to adjust buffer size would be awesome for less than fiber connections....
What did you expect to happen?
Retrieve large books in a timely manner
Steps to reproduce the issue
Audiobookshelf version
Andriod App / 2.30.0
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?
None
Logs
Additional Notes
Would be nice to have a local network auto switch feature ie book.server.com to 192.168.1.111 on wifi
@nichwall commented on GitHub (Oct 16, 2025):
Is this specific to the mobile app? https://github.com/advplyr/audiobookshelf-app
What file format are you using? Is this with all long books? The server will attempt to transcode a book if the client cannot directly play the media file. Logs would be useful.
I regularly listen to long books (40+ hours) and haven't experienced more than a few second delay while the transcoding starts if streaming.
Edit to add: just tested streaming a 151 hour audiobook remotely and playback started within 4 seconds.
@mattr254 commented on GitHub (Oct 17, 2025):
File format: m4b
Size: 3.84 GB
Using: android Audiobookshelf app
Yes, with all long books, The way of kings Saga(all 50 plus hrs per book),
all 5 books take a hot minute to buffer. Other books same format take a
fraction of that to load. Not exaggerating it literally takes 10 minutes to
buffer.
I'll post log files once I get back home
On Thu, Oct 16, 2025, 16:57 Nicholas W @.***> wrote:
@mattr254 commented on GitHub (Oct 17, 2025):
Forgot I could access the logs from the App. Here you go !
On Thu, Oct 16, 2025, 16:57 Nicholas W @.***> wrote:
@nichwall commented on GitHub (Oct 17, 2025):
How long is a "fraction of the time" and how big are the books which start streaming faster? Are they all single file books or multiple tracks?
Do these same books take as long to start playback using the web client as the mobile app?
Also you didn't attach any logs from either the server or the app.
@mattr254 commented on GitHub (Oct 17, 2025):
I've been slowly converting all my books over to m4b. The m4b are all single files.
Fraction of the time is typically less than 30 seconds. Not long enough to cause notice.
No change between web or android player. The other smaller books are typically less than 1GB. All files are on a 512 GB micro SD A2 speeds (100 MB/S read speed)