вс, 4 мая 2025 г., 16:31 Terje J. Hanssen <terjejhanssen@gmail.com>:

Den 04.05.2025 05:49, skrev Andrew Randrianasulu:

вс, 4 мая 2025 г., 01:37 Terje J. Hanssen <terjejhanssen@gmail.com>:

Den 03.05.2025 13:00, skrev Terje J. Hanssen:

Den 02.05.2025 21:42, skrev Andrew Randrianasulu:

пт, 2 мая 2025 г., 22:37 Terje J. Hanssen <terjejhanssen@gmail.com>:

https://www.mail-archive.com/cin@lists.cinelerra-gg.org/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?

Ok, as this old post by my mistake already has been forwarded to the list and replied, I will follow it up later today, but need to rig rig up my camcorder and devices

Finally ready, I had to recall a lot since 2023.

ls /dev/video*
/dev/video0 /dev/video1 /dev/video2 /dev/video3

for i in /dev/video*; do echo "$i"; udevadm info --query=all --attribute-walk --name=$i | grep -E "name"; done
/dev/video0
    ATTR{name}=="USB3.0 UHD: USB3.0 UHD"
/dev/video1
    ATTR{name}=="USB3.0 UHD: USB3.0 UHD"
/dev/video2
    ATTR{name}=="USB 2.0 Camera: HD 720P Webcam"
/dev/video3
    ATTR{name}=="USB 2.0 Camera: HD 720P Webcam"

v4l2-ctl --list-devices
USB 2.0 Camera: HD 720P Webcam (usb-0000:00:14.0-11.2):
    /dev/video2
    /dev/video3
    /dev/media1

USB3.0 UHD: USB3.0 UHD (usb-0000:00:14.0-3):
    /dev/video0
    /dev/video1
    /dev/media0

As seen the HDMI-USB3 capture card + the S-Video/HDMI converter (with the analog S-video camcorder) is now on /dev/video0
while the USB2 webcam is on /dev/video2

but what is on video1 ?

Nothing as far as I can see(?). It seems both camera devices allocate or are associated with three devices each.

it seems that whole thing fail at

Dequeued v4l2 buffer contains corrupted data (0 bytes).

I seems to happend when and after using unsupported fps

Does anything else (guvcview, vlc ..) process video stream this usb3 UHD device?

mplayer tv:// -demuxer tv ?

Not that I use, but have not haven't found a way to verify it.

However, I have recalled and found out more with progress.

The most important it seems required to reboot the machine with the camcorder ON (video signal) on beforehand, before ffmpeg get the video input.

Reboot also seems required to clean up v4L2 buffer after using unsupported fps ffplay or ffmpeg cause the
"Dequeued v4l2 buffer contains corrupted data (0 bytes)."
Hopefully there are a v4L command to easier cleanup the latter?

Does unpluggin and repluggin it helps without reboot?

Otherwise you probably want to talk to v4l2 maintainers or knowledgable people at suse forums ...

Beside the already listed Video4Linux devices, there are also

cat /proc/asound/cards

0 [PCH_1          ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0x4200910000 irq 168
1 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0x41300000 irq 169
2 [UHD            ]: USB-Audio - USB3.0 UHD
                      MACROSILICON USB3.0 UHD at usb-0000:00:14.0-3, super speed
3 [Camera         ]: USB-Audio - USB 2.0 Camera
                      Sonix Technology Co., Ltd. USB 2.0 Camera at usb-0000:00:14.0-11.2, high speed

However, so far ffmpeg has yet to find any audio streams via v4l2 as seen below.

may be you need another -i so you can point ffmpeg at alsa or pulseaudio audio capture device?

yes, this line grows bigger by the day ... )

S-vido as well as audio L/R cables are connected between the camcorder out and A/D converter IN.
Maybe additional configuration is required (I didn't think the separate sound card (Behringer U-Phono should be necessary)
----------

To list the v4l2 device capabilities;

v4l2-ctl -d /dev/video0 --list-formats-ext

ioctl: VIDIOC_ENUM_FMT
    Type: Video Capture

    [0]: 'YUYV' (YUYV 4:2:2)
        Size: Discrete 1920x1080
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 1600x1200
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 1360x768
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 1280x1024
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 1280x960
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 1280x720
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 1024x768
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 800x600
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 720x576
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 720x480
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)
        Size: Discrete 640x480
            Interval: Discrete 0.017s (60.000 fps)
            Interval: Discrete 0.020s (50.000 fps)
            Interval: Discrete 0.033s (30.000 fps)
            Interval: Discrete 0.050s (20.000 fps)
            Interval: Discrete 0.100s (10.000 fps)


That is supported 10-20-30-50-60 fps for all sizes, not 25 fps!

so it looks like it does some frame/field interpolation (for s-video input) without letting user correct/disable this?

Does this device come with manual of any sort? Any Windows utility perhaps?

-------------

Try the same test for /dev/video1

v4l2-ctl -d /dev/video1 --list-formats-ext

ioctl: VIDIOC_ENUM_FMT

===========

ffmpeg listed available formats (supported pixel formats, video formats, and frame sizes) for a particular input device:

ffmpeg -hide_banner -f v4l2 -list_formats all -i /dev/video0

[video4linux2,v4l2 @ 0x55a384b214c0] Raw       :     yuyv422 :           YUYV 4:2:2 : 1920x1080 1600x1200 1360x768 1280x1024 1280x960 1280x720 1024x768 800x600 720x576 720x480 640x480
[in#0 @ 0x55a384b21200] Error opening input: Immediate exit requested
Error opening input file /dev/video0.

And similar test for /dev/video1

ffmpeg -hide_banner -f v4l2 -list_formats all -i /dev/video1

[video4linux2,v4l2 @ 0x557e1a5164c0] ioctl(VIDIOC_G_INPUT): Inappropriate ioctl for device
[in#0 @ 0x557e1a516200] Error opening input: Inappropriate ioctl for device
Error opening input file /dev/video1.
Error opening input files: Inappropriate ioctl for device

===============

With supported 50 fps specified, ffplay playback looks ok visually:

ffplay -hide_banner -f v4l2 -input_format yuyv422 -video_size 720x576 -framerate 50 /dev/video0

Input #0, video4linux2,v4l2, from '/dev/video0':B sq=    0B
Duration: N/A, start: 311.577886, bitrate: 331776 kb/s
Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 720x576, 331776 kb/s, 50 fps, 50 tbr, 1000k tbn
^Cterje@localhost:/Videoklipp/HDMI-USB3_Capture> sq=    0B

===============

Capture DVD compatible MPG video (no audio found) with supported 50 fps progressive video.
No Audio stream!?

ffmpeg -hide_banner -f v4l2 -input_format yuyv422 -video_size 720x576 -framerate 50 -i /dev/video0 -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_50fps_ms2130.mpg

Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 323.195348, 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
[mpeg2video @ 0x55e390580200] 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_50fps_ms2130.mpg':
Metadata:
    encoder         : Lavf61.7.100
Stream #0:0: Video: mpeg2video (4:2:2), yuv422p(tv, progressive), 720x576, q=2-31, 8000 kb/s, 50 fps, 90k tbn
      Metadata:
        encoder         : Lavc61.19.101 mpeg2video
      Side data:
        cpb: bitrate max/min/avg: 8000000/8000000/8000000 buffer size: 20000000 vbv_delay: N/A
[out#0/vob @ 0x55e390581e00] video:18921KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 1.242550%
frame= 1000 fps= 50 q=2.5 Lsize=   19156KiB time=00:00:19.98 bitrate=7854.2kbits/s speed=0.998x

Stopped automatic ! Why?

may be usb cable just moved a bit?

----------------

du -sh *

19M    720x576_50fps_ms2130.mpg

ffprobe -hide_banner 720x576_50fps_ms2130.mpg

Input #0, mpeg, from '720x576_50fps_ms2130.mpg':
Duration: 00:00:20.00, start: 0.520000, bitrate: 7846 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

The video file playback looks ok with correct SD aspect ratio using ffplay and VLC, though "1080P" is printer near the top-right corner.

hm ...... I hope this "overlay" can be disabled?

============================