[Bug 779807] Both videomixer and glvideomixer do not want to work properly with avdec_h264 decoder

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779807

--- Comment #7 from Eugen Klim <ciceromarcus at yandex.ru> ---
Ok, so h264 stream https://yadi.sk/d/Iwpnwwxy3FMryR does not work, while the
stream decoded by ffmpeg as

>ffmpeg -i h264.ts -c:v h264 -c:a mp2 -f mpegts test.ts

works while

>ffmpeg -i h264.ts -c:v copy -c:a copy -f mpegts test.ts

does not.

The difference between those two are minor.

Transcoded stream (works):

>Input #0, mpegts, from './test.ts':
>  Duration: 00:00:26.81, start: 1.400000, bitrate: 1573 kb/s
>  Program 1 
>    Metadata:
>      service_name    : Service01
>      service_provider: FFmpeg
>    Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 720x576 [SAR 16:11 DAR 20:11], 25 fps, 25 tbr, 90k tbn, 50 tbc
>    Stream #0:1[0x101]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 384 kb/s

Copied stream (pipeline fails):

>Input #0, mpegts, from './test_copy.ts':
>  Duration: 00:00:26.78, start: 1.400000, bitrate: 3104 kb/s
>  Program 1 
>    Metadata:
>      service_name    : Service01
>      service_provider: FFmpeg
>    Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt470bg), 720x576 [SAR 16:11 DAR 20:11], 25 fps, 25 tbr, 90k tbn, 50 tbc
>    Stream #0:1[0x101]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 192 kb/s

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