[Cin] Analog S-Video to Digital HDMI converter + ms2130 UHD HDMI-USB3 Capture card

[Andrew Randrianasulu]

пт, 10 мар. 2023 г., 02:43 Terje J. Hanssen <terjejhanssen at gmail.com>:

> 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)
>
>
I am afraid you probably need help from ffmpeg-users mail list  here ....
Last line looks correct, yet not encoding??



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