пт, 2 мая 2025 г., 22:37 Terje J. Hanssen <[email protected]>:
> https://www.mail-archive.com/[email protected]/msg05748.html > > I contine this new thread with an short extract from the long growing > [Cin] ms2130 HDMI-USB3 UHD capture card - not quite as expected? > > But shouldn't a 422 and not a 420 output format be created? > > >> it seems in some cases ffmpeg not geared towards preserving most > information, just picks up most commonly defined/first pixel format. > >> Try mpeg2video as output codec, and/or specify pixel format (pix_fmt) > more explicitly before output's filename? > > >>> Could you possibly examplify the latter? > > >>>> I think I just theorized ffmpeg may try to get some info from alsa > device file directly, as it tries with /dev/video. But I never >>>> tried > this way, so I can be totally wrong! > > ------------------------------- > > Instead of 50i (pal interlaced fields), I try 50 fps (progressive) that at > least is a pal frequence. > > And yes, it seems from the output that ffmpeg uses mpeg1video as default > output codec. > > Furter I try to combine the current line > > ffmpeg -hide_banner -f v4l2 -input_format yuyv422 -video_size 720x576 > -framerate 25 -t 20 -i /dev/video2 out-720x576_ms2130.mpeg > > > with and utilize the syntax developed 2021 for "Blu-ray compliant MPEG-2 > SD video with LPCM audio" > > ffmpeg -i dv28.dv -c:v mpeg2video -refs 1 -bf 2 -b:v 25M -maxrate 25M > -minrate 25M -bufsize 45M -muxrate 45M -dc 10 -c:a pcm_s16be -f vob > dv28.mpg > > and for the current ongoing "DVD compliant MPEG-2 Video and PCM Audio" > > ffmpeg -hide_banner -i dv01.dv -c:v mpeg2video -refs 1 -bf 2 -b:v 8M > -maxrate 8M -minrate 8M -bufsize 20M -muxrate 11M -dc 10 -c:a pcm_dvd -f > vob -flags +ilme+ildct dv01.mpg > > to first > > ffmpeg -hide_banner -f v4l2 -input_format yuyv422 -video_size 720x576 > -framerate 50 -c:v mpeg2video -refs 1 -bf 2 -b:v 8M -maxrate 8M -minrate 8M > -bufsize 20M -muxrate 11M -dc 10 -c:a pcm_dvd -f vob -t 20 -i /dev/video2 > 720x576_50p_ms2130.mpg > Option b:v (video bitrate (please use -b:v)) cannot be applied to input > url /dev/video2 -- you are trying to apply an input option to an output > file or vice versa. Move this option before the file it belongs to. > Error parsing options for input file /dev/video2. > Error opening input files: Invalid argument > > > and next revised with no output. That is I need help to debug the syntax > error: > > ffmpeg -hide_banner -f v4l2 -input_format yuyv422 -video_size 720x576 > -framerate 50 -i /dev/video2 -c:v mpeg2video -refs 1 -bf 2 -b:v 8M -maxrate > 8M -minrate 8M -bufsize 20M -muxrate 11M -dc 10 -c:a pcm_dvd -f vob -t 20 > 720x576_50p_ms2130.mpg > [video4linux2,v4l2 @ 0x55db770ef9c0] Dequeued v4l2 buffer contains > corrupted data (0 bytes). > Input #0, video4linux2,v4l2, from '/dev/video2': > Duration: N/A, start: 0.000000, bitrate: 331776 kb/s > Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 720x576, > 331776 kb/s, 50 fps, 50 tbr, 1000k tbn > Stream mapping: > Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg2video (native)) > Press [q] to stop, [?] for help > [video4linux2,v4l2 @ 0x55db770ef9c0] Dequeued v4l2 buffer contains > corrupted data (0 bytes). > Last message repeated 30 times > [mpeg2video @ 0x55db77114f00] Warning vbv_delay will be set to 0xFFFF > (=VBR) as the specified vbv buffer is too large for the given bitrate! > Output #0, vob, to '720x576_50p_ms2130.mpg': > Metadata: > encoder : Lavf59.27.100 > Stream #0:0: Video: mpeg2video (4:2:2), yuv422p(tv, progressive), > 720x576, q=2-31, 8000 kb/s, 50 fps, 90k tbn > Metadata: > encoder : Lavc59.37.100 mpeg2video > Side data: > cpb: bitrate max/min/avg: 8000000/8000000/8000000 buffer size: > 20000000 vbv_delay: N/A > frame= 0 fps=0.0 q=0.0 Lsize= 0kB time=00:00:00.00 bitrate=N/A > speed= 0x > video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB > muxing overhead: unknown > Output file is empty, nothing was encoded (check -ss / -t / -frames > parameters if used) > > well, I think framerate still 25 for 50i stream .... can you re-check last line with framerate parameter removed or changed back to 25? > > > > >
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