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

Terje J. Hanssen terjejhanssen at gmail.com
Fri Dec 17 02:26:08 CET 2021



Den 16.12.2021 20:08, skrev Andrew Randrianasulu:
>
>
> On Thursday, December 16, 2021, Terje J. Hanssen via Cin 
> <cin at lists.cinelerra-gg.org> wrote:
>
>     [......]
>
>     As I already pointed on in another thread, a solution to capture
>     Hi8 to SD DV50 in 4:2:2 format was possible already 10 years ago
>     https://lists.cinelerra-gg.org/pipermail/cin/2021-December/004308.html
>     <https://lists.cinelerra-gg.org/pipermail/cin/2021-December/004308.html>
>
>     In a more recent thread here, Andrew mentioned a hdmi capture card
>     (with v4l2)
>     https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg02865.html
>     <https://www.mail-archive.com/cin@lists.cinelerra-gg.org/msg02865.html>
>     ===================
>
>     Therefore I wonder if we, CinGG users and devs, are able to setup
>     and test a recommended capture solution (w/card and guide) for SD
>     and HD video in 4:2:2 colorspace, preferably using free drivers
>     and tools like V4L/V4L2 and FFMpeg?
>     https://en.wikipedia.org/wiki/Video4Linux
>     <https://en.wikipedia.org/wiki/Video4Linux>
>     https://www.linuxtv.org/wiki/index.php/V4L_capturing
>     <https://www.linuxtv.org/wiki/index.php/V4L_capturing>
>
>
> I think I personally will be away from my desktop machine for few more 
> months..
>
> Terje, you already subscribed to ffmpeg-users, may be forward your 
> call for testing to this list too?
>
> I was think about one specific Youtuber
> https://www.youtube.com/user/renerebe
>
> he does have quite a bit of exotic/non-x86 hw, so may be he will be 
> able to get capture card(s) we talked about and even compile Cin on 
> some non-x86 devices and/or test our BD output on Playstation 3 :-)
>
>
Well, I posted a few topics at ffmpeg-users some years ago. Time will 
tell - this "project" is nor hurry, as we have several other tasks to 
complete. I had preferably thought this as a possibly updated testcase 
for video capturing withing CinGG as here in the manual:
https://cinelerra-gg.org/download/CinelerraGG_Manual/Transfer_VHS_DVD_Media_or_V.html

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/linux/v4l2
http://trac.gateworks.com/wiki/ventana#BoardSupportPackagesBSPSoftware

===============

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

ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
   built with gcc 11 (SUSE Linux)
[...]
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'SD-MOV.mov':
   Metadata:
     creation_time   : 2016-02-26T02:24:01.000000Z
   Duration: 00:00:29.84, start: 0.000000, bitrate: 79620 kb/s
   Stream #0:0(eng): Video: prores (HQ) (apch / 0x68637061), 
yuv422p10le(tv, bt709/unknown/unknown, top coded first (swapped)), 
720x576, 61154 kb/s, SAR 59:54 DAR 295:216, 25 fps, 25 tbr, 2500 tbn, 
2500 tbc (default)
     Metadata:
       creation_time   : 2016-02-26T02:24:01.000000Z
       handler_name    : Apple Video Media Handler
       vendor_id       : appl
       encoder         : Apple ProRes 422 (HQ)
   Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 
hexadecagonal, s32 (24 bit), 18432 kb/s (default)
     Metadata:
       creation_time   : 2016-02-26T02:24:01.000000Z
       handler_name    : Apple Sound Media Handler
       vendor_id       : [0][0][0][0]
[....]
Stream mapping:
   Stream #0:0 -> #0:0 (prores (native) -> dvvideo (native))
   Stream #0:1 -> #0:1 (pcm_s24le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, dv, to 'SD-DV50.dv':
   Metadata:
     encoder         : Lavf58.76.100
   Stream #0:0(eng): Video: dvvideo, yuv422p(tv, bt709/unknown/unknown, 
top coded first (swapped)), 720x576 [SAR 59:54 DAR 295:216], q=2-31, 200 
kb/s, 25 fps, 25 tbn (default)
     Metadata:
       creation_time   : 2016-02-26T02:24:01.000000Z
       handler_name    : Apple Video Media Handler
       vendor_id       : appl
       encoder         : Lavc58.134.100 dvvideo
   Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s 
(default)
     Metadata:
       creation_time   : 2016-02-26T02:24:01.000000Z
       handler_name    : Apple Sound Media Handler
       vendor_id       : [0][0][0][0]
       encoder         : Lavc58.134.100 pcm_s16le
frame=  746 fps=346 q=-0.0 Lsize=  209531kB time=00:00:29.84 
bitrate=57522.8kbits/s speed=13.8x
video:209812kB audio:5595kB subtitle:0kB other streams:0kB global 
headers:0kB muxing overhead: unknown

===================

du -sh *mov *dv
284M    SD-MOV.mov (source digitized from Hi8)
205M    SD-DV50.dv (ffmpeg re-encoded/remuxed)

DV50 size is here 72% of MOV (though other ProRes 422 and ProRes 422 LT 
has even lower bitrates).

-------------------

  284M    SD-MOV.mov (source digitized from Hi8) AV-info:

avprobe SD-MOV.mov
avprobe version 12.3, Copyright (c) 2007-2018 the Libav developers
   built on Mar 26 2018 12:39 with gcc 11 (SUSE Linux)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'SD-MOV.mov':
   Metadata:
     creation_time   : 2016-02-26T02:24:01.000000Z
   Duration: 00:00:29.84, start: 0.000000, bitrate: 79620 kb/s
   Stream #0:0(eng): Video: prores (HQ) (apch / 0x68637061), 
yuv422p10le(tv, bt709/unknown/unknown, top coded first (swapped)), 
720x576, 61154 kb/s, SAR 59:54 DAR 295:216, 25 fps, 25 tbr, 2500 tbn, 
2500 tbc (default)
     Metadata:
       creation_time   : 2016-02-26T02:24:01.000000Z
       handler_name    : Apple Video Media Handler
       vendor_id       : appl
       encoder         : Apple ProRes 422 (HQ)
   Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 16 
channels, s32 (24 bit), 18432 kb/s (default)
     Metadata:
       creation_time   : 2016-02-26T02:24:01.000000Z
       handler_name    : Apple Sound Media Handler
       vendor_id       : [0][0][0][0]
# avprobe output
----------------------

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).

-----------------

Terje J. H




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