[Cin] Analog S-Video to Digital HDMI converter + ms2130 UHD HDMI-USB3 Capture card
Terje J. Hanssen
terjejhanssen at gmail.com
Fri Mar 10 08:16:31 CET 2023
Den 10.03.2023 02:46, skrev 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??
My fault. I didn't remember I had to reboot to Tumbleweed to get pcm_dvd
encoder available.
Then it run as above and created the output file:
ffprobe -hide_banner 720x576_50p_ms2130.mpg
Input #0, mpeg, from '720x576_50p_ms2130.mpg':
Duration: 00:00:14.44, start: 0.520000, bitrate: 7749 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (4:2:2), yuv422p(tv,
progressive), 720x576 [SAR 1:1 DAR 5:4], 50 fps, 50 tbr, 90k tbn
Side data:
cpb: bitrate max/min/avg: 8000000/0/0 buffer size: 20004864
vbv_delay: N/A
Color subsampling;
I think we used -input_format "yuyv422" to correspond with the capture
card YUY2 to grab as much quality as possible.
However, DVD-Video does only support 4:2:0 chroma subsampling (not 4:2:2).
I tried to add "-pix_fmt yuv420p" on the output side after -c:v
mpeg2video but it didn't work.?
Interlacing:
DVDs are based on MPEG-2 encoding, which allows for either progressive
or interlaced sequences. However, very few discs use progressive
sequences, because the players are specifically designed for interlaced
output.
I tried to add the previous "-flags +ilme+ildct" but then again Empty
output file?
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