Playground throws: Uncaught (in promise) RuntimeError: memory access out of bounds

[guest271314]

Describe the bug
Playground throws

790132bf.a92c5f5d.js:1 Uncaught (in promise) RuntimeError: memory access out of bounds

To Reproduce
Upload tos.mkv from https://github.com/Kagami/mpv.js/blob/master/example/tos.mkv. Include arguments to convert to WebM.

Expected behavior
MKV file to be converted to WEBM file.

Screenshots

Desktop (please complete the following information):

• OS: Linux
• Browser: Chrome-For-Testing
• Version: 125

Smartphone (please complete the following information):

Additional context

[netmaster4]

This is the ffmpeg output of the tos.mkv file

FFmpeg Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
FFmpeg Stream #0:1 -> #0:1 (mp3 (mp3float) -> aac (native))
FFmpeg [aac @ 0x1177380] Too many bits 13653.333333 > 12288 per frame requested, clamping to max

[guest271314]

Works with ffmpeg on the machine.

[guest271314]

@netmaster4 Where is that aac coming from?

Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> vp9 (libvpx-vp9))
  Stream #0:1 -> #0:1 (mp3 (mp3float) -> opus (libopus))
  Stream #0:2 -> #0:2 (subrip (srt) -> webvtt (native))

[netmaster4]

direct from the tos.mkv file. and your Stream #0:1 with contains an MP3 ... and converts on ffmpegwasm to AAC. (default audio encoder)

Do you use the old v5.1 ffmpeg version on machine? i think its an ffmpeg sw bug not an ffmpeg wasm bug

[guest271314]

My machine is using ffmpeg version 4.4.2.

and converts on ffmpegwasm to AAC. (default audio encoder)

That might be the issue.

not an ffmpeg wasm bug

So you are able to convert the tos.mkv to tos.webm file in the playground on your machine?

[guest271314]

Wait a minute, is libvpx-vp9 not supported?

// equivalent ffmpeg.wasm API call
ffmpeg.exec(["-i","tos.mkv","-c:v","-c:v","libvpx-vp9","-c:a","libopus","-f","webm","tos.webm"]);

// equivalent ffmpeg command line
ffmpeg -i tos.mkv -c:v -c:v libvpx-vp9 -c:a libopus -f webm tos.webm

[NULL @ 0xef6d90] Unable to find a suitable output format for 'libvpx-vp9'
libvpx-vp9: Invalid argument
Aborted()