[Cin] Is SD and HD 422 Video Capture obtainable with V4L(2)?

[Terje J. Hanssen]

Den 17.12.2021 04:58, skrev Andrew Randrianasulu:
>
>
> On Friday, December 17, 2021, Terje J. Hanssen 
> <terjejhanssen at gmail.com <mailto:terjejhanssen at gmail.com>> wrote:
>
>
>
>     [..........]
>
>     Regardless, as mentioned would part of this be to evaluate more
>     current capture cards with preV4L2 Linux support.
>
>     I just googled around and without knowing their actuality or price
>     levels for con-/pro-sumers, one name Gateworks at least seems to
>     promote V4L2 heavily in their product wikies, i.e
>     http://trac.gateworks.com/wiki/Yocto/Video_In
>     <http://trac.gateworks.com/wiki/Yocto/Video_In>
>     http://trac.gateworks.com/wiki/linux/v4l2
>     <http://trac.gateworks.com/wiki/linux/v4l2>
>     http://trac.gateworks.com/wiki/ventana#BoardSupportPackagesBSPSoftware
>     <http://trac.gateworks.com/wiki/ventana#BoardSupportPackagesBSPSoftware>
>
>
> is there possibility they talk about single-board computers and their 
> embedded video chips? (not something you can plug into desktop/laptop..)
>
>
Very possible ;) I became unsure when I saw Arm mentioned, but so mini 
PCIe, and I didn't dwell more on it.
Other v4l2 candidates with analog video included - or among other 
mentioned Osprey, AVerMedia or BMD?
  https://www.mail-archive.com/cinelerra@skolelinux.no/msg10886.html

>     ===============
>
>     I-frame-only 50 Megabit MPEG-2 or comparable DV50 in 4:2:2 as
>     high-end, "visual lossless" intermediate format for archival and
>     suited for editing?
>
>     -----------------
>
>     Regarding DV50, FFMpeg has a friendly "target dv50" support
>     (similar as "target DVD"). So to get a first look on a DV50 test
>     file, I simply transcoded 422/10bit Video and PCM audio from a MOV
>     file (ProRes 422HQ) to a raw DV50 (422/8bit) file:
>
>         ffmpeg -i SD-MOV.mov -target pal-dv50 SD-DV50.dv
>
>     [......]
>

>     205M    SD-DV50.dv (ffmpeg re-encoded/remuxed) AV-info:
>
>     avprobe SD-DV50.dv
>     avprobe version 12.3, Copyright (c) 2007-2018 the Libav developers
>       built on Mar 26 2018 12:39 with gcc 11 (SUSE Linux)
>     [dv @ 0x55cdddb96440] Estimating duration from bitrate, this may
>     be inaccurate
>     Input #0, dv, from 'SD-DV50.dv':
>       Metadata:
>         timecode        : 00:00:00:00
>       Duration: 00:00:29.80, start: 0.000000, bitrate: 57600 kb/s
>       Stream #0:0: Video: dvvideo, yuv422p, 720x576 [SAR 16:15 DAR
>     4:3], 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
>       Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
>       Stream #0:2: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
>     # avprobe output
>
>     ===================
>
>     As seen above, it looks like ffmpeg produced wrong meta data for
>     the DV50 video bitrate (25 Mb/s=DV25), while the total bitrate
>     57.6 Mb/s is correct. (Also similar was seen with ffprobe and
>     Mediainfo).
>
>     My VLC player or Gnome movieplayer did not playback the DV50 file,
>     while ffplay did (as usual without audio?).
>
>     Cin-GG miss a DV50 preset among format setting. However DV50 else
>     loades preliminary OK in Cin-GG (via ffmpeg).
>
>
> I'll look at dv50 output preset..
>
>
>
Fine