[FFmpeg-user] Video concatenation not working.

Nicolas George george at nsup.org
Sat Dec 7 12:33:20 CET 2013

Le septidi 17 frimaire, an CCXXII, ನಾಗೇಶ್ ಸುಬ್ರಹ್ಮಣ್ಯ (Nagesh S) a écrit :
>     Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 /
> 0x31637661), yuv444p, 720x486 [SAR 1:1 DAR 40:27], 38 kb/s, 25 fps, 25 tbr,
> 12800 tbn, 50 tbc (default)

>     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
> 1280x720, 270 kb/s, 15 fps, 15 tbr, 30 tbn, 30 tbc (default)

As Carl Eugen said, it is not at all certain you can just concatenate
together streams that are so different. At the very least you would need to
chose the right time base, and the result would be variable frame rate,
which, unless I am mistaken, is not possible with FFmpeg's MP4 muxer.

>     Metadata:
>       creation_time   : 1970-01-01 00:00:00
>       handler_name    : VideoHandler
>     Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp,
> 143 kb/s (default)

The concat demuxer can not deal files with different streams. You need to
have audio in your first file too if you want it.


  Nicolas George
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