[Cin] Record camcorder video stream via v4l2 and hdmi-usb3 capture as input device
Terje J. Hanssen
terjejhanssen at gmail.com
Thu May 29 04:45:09 CEST 2025
Den 29.05.2025 01:27, skrev Andrew Randrianasulu:
>
>
> ср, 28 мая 2025 г., 23:38 Terje J. Hanssen <terjejhanssen at gmail.com>:
>
>
>
> Den 27.05.2025 21:29, skrev Andrew Randrianasulu:
> > On Tue, May 27, 2025 at 10:47 PM Terje J. Hanssen
> > <terjejhanssen at gmail.com> wrote:
> >> 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 left first two as defaults, and sometimes for screenrecording set
> > Samples instead of Software timing (so it will write stream relative
> > to audio samples, adding or dropping frames as needed - makes audio
> > and video track match)
> >
> > There should be std. for cingg wrench icon where you select type of
> > encoding (FFMPEG ..).
> > If you click it you get window with compression parameters.
> > I set Pixels there.
>
>
> Yeah, thank you - now it's hopefully better in my fingers :)
>
> First, with my Sony FX7E HDV 1080i50 camera connected via
> HDMI-ms2130-USB3 - 4vl2
>
> That is the camera's EIP native (w/o MPEG-2 compression) output
> via HDMI
> handshake expected FHD 1080i 422,
> or is it just the ms2130 via USB3 and v4l2 capability that is
> detected
> below?
>
>
>
> Very good question. HDMI is (uncompressed) digital video interface,
> likewise USB3 is also digital, BUT as we noted in another thread by
> default ms2130 does its own signal processing, but with hacked
> firmware this can be disabled and thus this usb3 dongle become sort of
> generic digital input device at relatively high speed (75 Mbytes/s).
>
> Unless you set your camera as giant "webcam" I think that is on HDMI
> output is result of decoding mpeg2 from tape?
My tests here were just camera without tape. I'll have a look with tape
playing to find the bitrate over HDMI out.
And to repeat the relevant sections from to Steve Mullen's FX7 and V1
handbook:
When the camera is operating, the EIP generates uncompressed 1440x1080i
with a 4:2:2 color space.
Digital 4:2:2 data are output via the HDMI port
Therefore, you can record 4:2:2 live HD video from the camera without
MPEG-2 compression.
Two-channel audio is output on the HDMI port, both when the camera is
running and during tape
playback.
The Sony V1 and FX7 provide an HDMI output port that carries
uncompressed 4:2:2, 8-bit,
digital video plus dual-channel, PCM, 16-bit, 48kHz audio.
If you record to HDV tape, you can also benefit from HDMI uncompressed
capture and editing.
After MPEG-2 decoding, the 4:2:2, 8-bit YCbCr uncompressed video is sent
via the camcorder’s
HDMI port
If you are playing a 1080i50 or 1080i60 HDV tape. The 4:2:0 MPEG-2 is
decoded and chroma up-scaled to a 4:2:2.
The HDMI chip downscales 1440 to 1280 while it up-scales 540 to 720.
The result is 720p50 or 720p60, which is output via HDMI.
>
>
>
> ffplay -hide_banner -f v4l2 -framerate 50 -i /dev/video0
> Input #0, video4linux2,v4l2, from '/dev/video0':B sq= 0B
> Duration: N/A, start: 290.793132, bitrate: 1658880 kb/s
> Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422,
> 1920x1080,
> 1658880 kb/s, 50 fps, 50 tbr, 1000k tbn
>
> v4l2-ctl -V
> Format Video Capture:
> Width/Height : 1920/1080
> Pixel Format : 'YUYV' (YUYV 4:2:2)
> Field : None
> Bytes per Line : 3840
> Size Image : 4147200
> Colorspace : sRGB
> Transfer Function : Rec. 709
> YCbCr/HSV Encoding: ITU-R 601
> Quantization : Default (maps to Limited Range)
> Flags :
>
> -----------------
>
> So I tested two additional mpeg2-hdv and mpeg2_hq recordings with
> CinGG
> that works ok:
>
> 1) mpeg2_hdv_mpeg + mp2
> ---------------------------------------------
> 1920X1080
> 50fps
> mpeg1_mp2.mpeg (no PCM available)
> mpeg2_hdv_mpeg
> yuv422p (default yuv420, shouldn't 422 be detected automatic from the
> input?)
>
>
> I think capture logic predates ffmpeg integration, so not sure if it
> possible .. I'll look into it.
>
>
>
> BC_DisplayInfo::gl_fb_config failed
> DeviceV4L2Base::v4l2_open pixels="YUYV"; res="1920x1080 1600x1200
> 1360x768 1280x1024 1280x960 1280x720 1024x768 800x600 720x576 720x480
> 640x480"
> v4l2 s_fmt 1920x1080 YUYV
> DeviceV4L2Base::v4l2_open VIDIOC_S_STD: Unsuitable«ioctl» for device
> -------
>
> ffprobe -hide_banner CinGG_Record_mpeg2_hdv_video+mp2_audio.mpeg
> Input #0, mpeg, from 'CinGG_Record_mpeg2_hdv_video+mp2_audio.mpeg':
> Duration: 00:00:09.31, start: 0.509978, bitrate: 25439 kb/s
> Stream #0:0[0x1e0]: Video: mpeg2video (4:2:2), yuv422p(tv,
> bt709/unknown/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 50
> fps, 50 tbr, 90k tbn
> Side data:
> cpb: bitrate max/min/avg: 0/0/0 buffer size: 7110656
> vbv_delay: N/A
> Stream #0:1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16p, 384 kb/s
> -------
>
> My comments:
> The default 25Mbps video bitrate is just like mpeg2/ MP at H-14 HDV
> 1080i50
> 420 on tape.
> Max allowed is 60 Mbps
> PCM audio is missing
>
> ============
>
> 2) mpeg2_hq_mpeg + mp2
> -------------------------------------------
> 1920X1080
> 50fps
> mpeg1_mp2.mpeg (no PCM available)
> mpeg2_hq_mpeg
> yuv422p (default yuv420, shouldn't 422 be detected automatic from the
> input?)
>
> DeviceV4L2Base::v4l2_open pixels="YUYV"; res="1920x1080 1600x1200
> 1360x768 1280x1024 1280x960 1280x720 1024x768 800x600 720x576 720x480
> 640x480"
> v4l2 s_fmt 1920x1080 YUYV
> DeviceV4L2Base::v4l2_open VIDIOC_S_STD: Unsuitable«ioctl» for device
> -----------
>
> ffprobe -hide_banner CinGG_Record_mpeg2_hq_video+mp2_audio.mpeg
> Input #0, mpeg, from 'CinGG_Record_mpeg2_hq_video+mp2_audio.mpeg':
> Duration: 00:00:11.55, start: 0.509978, bitrate: 6379 kb/s
> Stream #0:0[0x1e0]: Video: mpeg2video (4:2:2), yuv422p(tv,
> bt709/unknown/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 50
> fps, 50 tbr, 90k tbn
> Side data:
> cpb: bitrate max/min/avg: 0/0/0 buffer size: 1130496
> vbv_delay: N/A
> Stream #0:1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16p, 384 kb/s
> ------
> My comments:
> The default 6.37Mbps video bitrate is not very "hq", more like a
> SD DVD
> bitrate
> PCM audio is missing
>
> =====================
>
> Sometime in the future, additional presets (especial 422p) from
> common
> MPEG-2 Profile/Level combinations could be useful
> https://en.wikipedia.org/wiki/H.262/MPEG-2_Part_2#Video_profiles_and_levels
>
>
>
> PCM in mpeg2ts tend to be unsupported? It stuffed into private stream
> and even ffmpeg itself does not know how to extract it back? So if
> you want to put video+audio back to tape you are stuck with that
> camera itself produces .... If you prepare files for PC viewing you
> can encode in any codec/audio codec/container combination.
HDV 1080i 25Mbps (M2T) compressed on miniDV tapes has only space for
embedded MP2 audio, HDV 720p optional PCM.
Else, "HDV" in various MPEG-2 formats can be stored with PCM audio,
included DVD and Bluray..
All XDCAM video formats use MPEG-2 and PCM audio
https://en.wikipedia.org/wiki/XDCAM#XDCAM_formats
> Feel free to modify some presets, and I think there was way to save
> them from GUI?
I'll look at that
>
> Obvious question that tended to bite me back in the day: does audio
> and video stay in sync over longer periods of time?
>
>
>
>
>
>
>
>
>
> >> 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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