[Cin] offtopic: proprietary software making BD from HDV

[Terje J. Hanssen]

Den 22.11.2022 18:55, skrev Andrew Randrianasulu:
> so according to link below it was possible in 2010  or so.
> thing is apparently new versions remove this feature because you know, 
> 'progress'!
>
> https://www.vegascreativesoftware.info/us/forum/hdv-to-blu-ray-why-is-it-recompressing--80924/
>
> I think technically it completely possible, just need some coding 
> thinking.

Yes, I have also noticed that forum thread.
(And not to confuse with, I read in another forum somewhere that 
Playstations could use "homemade" BDAV disc format, but later certainly 
only BDMV discs)

>
> Terje, can you check if 'native mpeg' decoder still works for HDV 
> specifically? (toggle Use FFmpeg first icon/button in main window and 
> then load your file(s) )

Yes, Cin-GG via FFmeg first loads and playback my HDV-1080i50,m2t files, 
and also the same files with audio transcoded to ac3 or pcm_bluray.
Playback of pcm_bluray audio has noticeable lower volume in CinGG while 
it louds normal in VLC.

l
>
> I think it was working in cinelerra 2.x times because people edited 
> HDV back then and ffmpeg was little decoding library inside 
> libquicktime folder for some mov/avi decoding ....
>
> may be developing mpeg2 video elementary stream direct copy will be a 
> bit less of Task compared to more generic case? At least libmpeg3 
> already know how to create index file, so info about  keyframes and 
> GOPs all should be there ...'only' problem  I never dived that deep 
> into real inner workings of encoder (some forum post suggest you need 
> to edit at *field* boundary, not frame boundary, and this complicates 
> things a bit), and one bit set wrong there obviously can make file 
> unplayable :(
>