[Cin] Record camcorder video stream via v4l2 and hdmi-usb3 capture as input device

[Terje J. Hanssen]

Den 27.05.2025 16:28, skrev Andrew Randrianasulu:
> On Tue, May 27, 2025 at 7:02 PM Terje J. Hanssen via Cin
> <cin at lists.cinelerra-gg.org> wrote:
>>
>>
>> Den 27.05.2025 12:54, skrev Terje J. Hanssen:
>>
>> I tried to Record camcorder video stream via v4l2 and hdmi-usb3 capture as input device.
>>
>> ms2130 is more powerful but else similar to the usb2 EasyCap device example described in the CinGG manual
>> https://cinelerra-gg.org/download/CinelerraGG_Manual/Use_Case_1_a_EasyCap.html
>>
>> My Sony FX7-E 1080i50 HDV camcorder was connected via HDMI to a ms2130 usb3 capture card.
>>
>> My procedure description here on openSUSE Tumbleweed-Slowroll, kernel  6.12.30-1.0.4.sr20250501-longterm
>>
>> ~/Applications> ./CinGG-20250430-x86_64.AppImage
>> Cinelerra Infinity - built: Apr 30 2025 07:18:32
>>
>> 1) Settings > Preferences > Record
>>
>> File format: FFMPEG     mp4
>>
>> Video In:
>>
>> Record driver: Video4Linux2 /dev(video0
>>
>> The first thing I noticed was that default Record video setting was SD NTSC, not PAL as else according to my time zone.
>> Could this possibly be changed as else?
>>
>> Frames to record on disk: 30 (default)?
>>
>> Changed frame to a camcorder resolution and fps supported by v4l2 and ms2130:
>>
>> Frame: 1920 x 1080 (was default NTSC SD)
>> fps: 50 (progressive)
>>
>>
>> File > Record r
>>
>> Two windows opened, one showing the running record time etc. and the other the camera window image.
>>
>>
>> Unhappily, when I reconnected the camcorder to re-test today, the second window with the camera image did not longer open!!
>> I've tried to reset the machine and camcorder, but no. Did also a test with system ffplay (when the v4l2 was free again) and it worked.
>>
>> Obviously here is something that causes this confusing issue, but what?  load straty, a changed setting or something else?
>> Happily the window opened yesterday, so I know the should work.
>> I understand this can be difficult to troubleshoot without a similar setup.
> There is checkbox named Monitor Video. Be sure you have it  set.

Yes, thanks it works again.
> I usually set all parameters (like frame size, framerate, type of
> Video Input device) in Recording tab.

Yes, but I wonder what these default box values mean?

  * Frames to record to disk at a time: 30
  * Frames to buffer in device: 2
  * Positioning: Software timing

I have yet to find where to set color subsampling yuv422p, bitrate, 
quality profile etc

I recorded three test file types with their defaults, and all got yuv420p

CinGG_Record1.mp4
Duration: 00:00:09.05, start: 0.000000, bitrate: 5044 kb/s
Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), 
yuv420p(tv, bt709/unknown/unknown, progressive), 1920x1080, 4952 kb/s, 
50 fps, 50 tbr, 12800 tbn (default)

CinGG_Record2.mkv
Duration: 00:00:13.66, start: -0.007000, bitrate: 890 kb/s
Stream #0:0: Video: vp9 (Profile 0), yuv420p(tv, bt709/unknown/unknown), 
1920x1080, 50 fps, 50 tbr, 1k tbn

CinGG_Record3.mpeg
Duration: 00:00:22.26, start: 0.520000, bitrate: 2321 kb/s
   Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, 
bt709/unknown/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 50 
fps, 50 tbr, 90k tbn


>
> Note that in your case while you record SD it gets upscaled by your
> svideo -> hdmi and  hdmi to usb converters to 1080p50
> There is red button and above it filename input field. Put
> path/filename there, hit Record, and it should start recording to that
> file.
>
> In case  you played with contrast/brightness settings (cingg uses its
> own set for v4l devices) you can run guvcview and restore them to
> their default values




>
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