Remove node-ffprobe dependency

server/libs/nodeFfprobe/LICENSE

@@ -0,0 +1,22 @@
+(The MIT License)
+
+Copyright (c) 2011 Listener Approved LLC.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

server/libs/nodeFfprobe/index.js

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+//
+// node-ffprobe modified for audiobookshelf
+// SOURCE: https://github.com/ListenerApproved/node-ffprobe
+//
+
+const spawn = require('child_process').spawn
+
+module.exports = (function () {
+  function doProbe(file) {
+    return new Promise((resolve, reject) => {
+      let proc = spawn(module.exports.FFPROBE_PATH || 'ffprobe', ['-hide_banner', '-loglevel', 'fatal', '-show_error', '-show_format', '-show_streams', '-show_programs', '-show_chapters', '-show_private_data', '-print_format', 'json', file])
+      let probeData = []
+      let errData = []
+
+      proc.stdout.setEncoding('utf8')
+      proc.stderr.setEncoding('utf8')
+
+      proc.stdout.on('data', function (data) { probeData.push(data) })
+      proc.stderr.on('data', function (data) { errData.push(data) })
+
+      proc.on('exit', code => { exitCode = code })
+      proc.on('error', err => reject(err))
+      proc.on('close', () => resolve(JSON.parse(probeData.join(''))))
+    })
+  }
+
+  return doProbe
+})()