[FFmpeg-user] Hidden audio in H264 - wrapped_avframe

[Hans Schuell (GiraOne)]

Thanks for the suggestion, but the command leads to the same error, I already had:

Stream map '' matches no streams.
To ignore this, add a trailing '?' to the map.
Failed to set value '0:a' for option 'map': Invalid argument

Regarding "you cannot STORE raw h264 video (without reencode) in mp4 container": If I omit the audio, then I can use "-map 0:0 -codec:v copy" and the result is a useable MP4 (without audio). But the audio must be somewhere in the file, otherwise the HQCAM converter tool wouldn't be able to access it. 


-----Ursprüngliche Nachricht-----
Von: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> Im Auftrag von BloodMan
Gesendet: Montag, 14. April 2025 14:49
An: ffmpeg-user at ffmpeg.org
Betreff: Re: [FFmpeg-user] Hidden audio in H264 - wrapped_avframe

Hello,

And IMO should not work.

.h264 is video only stream in general. Does not contain audio so searching or encoding audio will not succeed. BUT:

I do not work with wrapped_avframe, but you may try:

ffmpeg -i file.h264 -hide_banner -loglevel warning -err_detect ignore_err -dn -sn -map 0:v -map 0:a -f fifo -pix_fmt yuv420p -c:v libx264 -preset veryfast -profile:v high -level 41 -crf 16 -tune film -c:a aac -b:a 160k -ac 2 -ar 48000 -shortest -y -f mp4 output.mp4

Why? you cannot STORE raw h264 video (without reencode) in mp4 container
- so you should reencode first (just like audio).

Hope it helps.



W dniu 2025-04-14 o 13:57, Hans Schuell (GiraOne) pisze:
[cut]
>
> ffmpeg -i file.h264 -hide_banner -loglevel warning -err_detect 
> ignore_err -dn -sn -map 0:0 -codec:v copy -map 0:1 -filter:a 
> aresample=osr=8000:ochl=mono -codec:a aac -b:a 64k -shortest file.mp4
> 
> it doesn't work. It leads to


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