[FFmpeg-user] mp4 opus invalid extradata size (missing header)

[Carl Eugen Hoyos]

Am Di., 3. Sept. 2019 um 18:39 Uhr schrieb Juan Navarro <juan.navarro at gmx.es>:

> I'm trying to record a plain RTP stream, both with GStreamer and with
> FFmpeg, with either H.264 or VP8 video codecs, and OPUS audio in all cases.
>
> I got this working for VP8+OPUS (WEBM) with GStreamer and FFmpeg, and
> H.264+OPUS (MP4) with GStreamer, but _not_ FFmpeg. After some testing I
> was able to isolate the issue to recording OPUS audio with FFmpeg into
> MP4 container (a somewhat uncommon combination I know, but afaik MP4
> should be technically able to store OPUS, and it works great with
> GStreamer so it is definitely possible).
>
> FFmpeg is missing some extradata, and after the recording is done (after
> pressing 'q'), no moov or any other kind of header is written to the MP4
> file. However, I guess there is actual OPUS audio in the file, as the
> file takes several 100s KB.
>
> FFmpeg version is today's Git master. Report logs, and input SDP files,
> are attached to this email (with full command line and output, as per
> the '-report' option).

Feel free to test this patch and report back here:
https://ffmpeg.org/pipermail/ffmpeg-devel/2019-September/250177.html

Carl Eugen