[CinCV TNG] 10-bit ProRes 422 (HQ) and matching Cinelerra Color models?

Terje J. Hanssen terje at nordland-teknikk.no
Thu Feb 25 00:52:04 CET 2016


Hi friends,

Finally I had success to master my first 1920x1080 HD clips in 10-bit 
ProRes 422 (HQ) compressed format on a Blackmagicdesign HyperDeck 
Shuttle 2/SSD video recorder. The video source was HDMI out on my Sony 
HDR-FX7E camcorder, both camera EIP and HDV tape playback.

My first impression of these initial test files is that picture and 
color quality seems promising in comparision with normal HDV playback ( 
.m2t).

Use ffprobe to query information about the camera generated SSD recorded 
file:

ffprobe Capture0000.mov
ffprobe version 2.8.6 Copyright (c) 2007-2016 the FFmpeg developers
   built with gcc 4.8 (SUSE Linux)
...................
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Capture0000.mov':
   Metadata:
     creation_time   : 2016-02-23 23:49:21
   Duration: 00:01:11.24, start: 0.000000, bitrate: 200607 kb/s
     Stream #0:0(eng): Video: prores (apch / 0x68637061), 
yuv422p10le(bt709), 1920x1080, 182130 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 
tbr, 2500 tbn, 2500 tbc (default)
     Metadata:
       creation_time   : 2016-02-23 23:49:21
       handler_name    : Apple Alias Data Handler
       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   : 2016-02-23 23:49:21
       handler_name    : Apple Alias Data Handler
---------------------

I was able to playback this ProRes 422 (HQ).mov with VLC and Gnome Media 
Player, and also load it in Cinelerra 5 (not with Cinellera-CV).

Can someone explain me how to verify if Cinelerra understand this video 
format either as a 10-bit 422 HD 1920x1080i at 16:9 aspect, or possibly 
as a 8-bit 422 HD 1440x1080i anamorphic 4:3 aspect format (HDV)?

According to the Cinelerra documentation Cinelerra's highest ('normal) 
color model is  YUVA-8, with RGBA-Float on top of that (for special 
purposes?) Other has explained that Cinelerra's preferred uncompressed 
format is yuv2 video (8-bit packed YUV 422) and pcm audio.

Can someone explain if this will be the perfect quality match to 
preserve a master in 10-bit ProRes (HQ) color model (orginated from 
8-bit 422 via the camcorder's HDMI out), or if this possibly may cause 
some color color degradation (banding) due to 8-bit vs 
10-color/packaging as outlined in a couple of previous references below?

http://www.heroinewarrior.com/cinelerra_8bit.jpg
https://larryjordan.com/articles/why-video-bit-depth-matters/


Cheers,
Terje J. H



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