[Bug] M4A downloads fail for post-live streams

[offshade]

Checklist

• I make sure that the issue is NOT a duplicate of pinned issues
• I make sure I am using the LATEST version - check here
• I understand that issues with limited impact, such as those occurring on specific devices or under specific network conditions, will not be fixed
• I have attached the error report in the issue

Describe the bug

m4a Audio Downloads return error or empty downloaded files. The only downloads that are working are the opus ones, when available. In NewPipe the same Youtube videos return a "file not available".

Version

5.3.0 beta 1

Frequency

Always (100% of the time)

Device

Samsung Galaxy A36, Android 14

Steps to reproduce the bug

Download audio

Additional context

No response

[InfinityLoop1308]

which video? what endpoint are you using? visionOS or mweb?

[offshade]

Youtube audio from finished live feeds from subscribed channels on my Android phone. I don't know about visionOS or mweb.

[offshade]

which video? what endpoint are you using? visionOS or mweb?

These are the options that are provided in a live stream that ended half an hour ago, and all of them result in errors or empty files. In NewPipe the same video returns "no streams available to download". Most likely the video is not ready to have its audio downloaded, therefore PipePipe shouldn't offer those m4a options that are non working. Only when an opus otpion is provided is the audio downloadable.

[lordkitsuna]

I am also getting this failure here is the error report

{"user_action":"download failed","request":"https://www.youtube.com/watch?v=3gQ4kQ2vMOY [ {type=video format=WebM quality=720p videoOnly=true} ]","content_language":"en-US","content_country":"US","app_language":"en_US","service":"YouTube","endpoint":"visionos","package":"InfinityLoop1309.NewPipeEnhanced","version":"5.2.5","os":"Linux Android 16 - 36","time":"2026-08-21 20:47","exceptions":["java.lang.IllegalArgumentException: Negative size\n\tat sun.nio.ch.FileChannelImpl.truncate(FileChannelImpl.java:379)\n\tat us.shandian.giga.io.FileStreamSAF.setLength(r8-map-id-d52fe7a0c9e2aeb2ddb232ab0614e5b949c3b9a4273459f4324b0fd8e608de8c:3)\n\tat us.shandian.giga.get.DownloadInitializer.run(r8-map-id-d52fe7a0c9e2aeb2ddb232ab0614e5b949c3b9a4273459f4324b0fd8e608de8c:416)\n"],"user_comment":""}

Seems to just fully affect the content in general as I cannot watch it either. The video plays back fine, but there's no audio.