Den 04.05.2025 05:49, skrev Andrew Randrianasulu:
вс, 4 мая 2025 г., 01:37 Terje J. Hanssen <[email protected]>:
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 <[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?
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?
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.
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!
-------------
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?
----------------
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.
============================
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