[Cin] Is SD and HD 422 Video Capture obtainable with V4L(2)?
Andrew Randrianasulu
randrianasulu at gmail.com
Fri Dec 17 04:58:16 CET 2021
On Friday, December 17, 2021, Terje J. Hanssen <terjejhanssen at gmail.com>
wrote:
>
>
> 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/msg
>> 02865.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/Transfe
> r_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
>
>
is there possibility they talk about single-board computers and their
embedded video chips? (not something you can plug into desktop/laptop..)
> ===============
>
> 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).
I'll look at dv50 output preset..
>
> -----------------
>
> Terje J. H
>
>
>
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