Den 17.12.2021 04:58, skrev Andrew Randrianasulu:
On Friday, December 17, 2021, Terje J. Hanssen <[email protected] <mailto:[email protected]>> 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/[email protected]/msg10886.html
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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?
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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
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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