[Cin] Blu-ray compliant MPEG-2 SD video with LPCM audio

[Terje J. Hanssen]

Den 29.11.2021 02:07, skrev Andrew Randrianasulu:
>
>
> On Monday, November 29, 2021, Terje J. Hanssen via Cin 
> <cin at lists.cinelerra-gg.org <mailto:cin at lists.cinelerra-gg.org>> wrote:
>
>     2) SD ProRes.mov, 422 (HQ) 10-bit video with LPCM stereo audio :)
>
>
>     Den 28.11.2021 22:48, skrev Terje J. Hanssen:
>
>         The source video files I want to convert to Blu-ray compliant
>         MPEG-2 SD video with LPCM audio are:
>         1) DV25.dv, 720 x 576 (PAL), 50i 4:2:0 video with LPCM stereo
>         audio
>         and
>         2) SD ProRes.mov, 422 (HQ) 19-bit video with LPCM stereo audio
>
>         The purpose is to get better MPEG-2 quality using higher
>         (highest) possible bitrate than for DVD video.
>         (Yes, I have tested h.264 via Cin-GG)
>
>
>         Here a sample ffmpeg command script found for HD video with
>         PCM (Blu-ray not mentioned):
>         https://gist.github.com/avoidik/153879c06afdcaad8d69b38bcc00abb7
>         <https://gist.github.com/avoidik/153879c06afdcaad8d69b38bcc00abb7>
>         # with PCM 16-bit audio (uncompressed), constant video bitrate
>         with specific bitrate tolerance
>
>         ffmpeg -i "input.mp4" \
>           -c:v mpeg2video -pix_fmt yuv422p -refs 1 -bf 2 -b:v 50M
>         -maxrate 50M -minrate 50M \
>           -s 1920x1080 -aspect 16:9 \
>           -c:a pcm_s16be -f vob \
>           "output.mpg"
>
>

Andrew,

Thank you for your review and suggestions. I'll put the pieces together 
tomorrow and start testing with em...

>
> for SD files replace '-s 1920x1080' with '-s 720x576' or omit this 
> part {better} .

Not sure how to treate 720x576 (4:3) with regards to displaying on a 
16:9 Widescreen (HDTV), possibly crop the frames next to
SD Wide (16:9) "These resolutions are stored anamorphically, i.e. they 
are stretched to the display aspect ratio by the player or display."

>
> '-b:v 40M -maxrate 40M -minrate 40M'.  for 40 mbit/s fixed bitrate. 
> for smaller bitrate just replace numbers.
>
> -f m2ts for mpeg2 transport stream.
>
> most likely remove -pix_fmt part.
>
> -i your file (ffmpeg hopefully will detect its type and codecs 
> automatically)


So any Mpeg2 Profile at Level is neither required as discussed here:
https://forum.videohelp.com/threads/345143-mpeg2-MP-ML-with-ffmpeg#post2153378


>
> keep -c:v mpeg2video part
>
> I do not think you need mp4box for further conversion, as name suggest 
> it mostly deals {at output end} with mp4 format, not mpeg2 transport 
> stream (but you mentioned putting pcm in mp4, so I researched this 
> part too)

PCM and ffmpeg was also discussed here
https://forum.doom9.org/showthread.php?p=1811816#post1811816

>
> try tsmuxer (gui) next (not sure if Appimage works for you, if not try 
> their linux build from their github - tags - assets (there you need to 
> expand 'assets' arrow/triangle to see various binary and source 
> archives).
>
>

Yep, tsMuxer still launches fine from my Appimage installation. I'll 
have a look at it later....

>
>
>         Suggestion to FFMpeg command to convert the actual SD video
>         files Blu-ray compat?
>         And if  LPCM has to be muxed via MP4(Box) first, a guideline
>         is welcome?
>
>         ------------------
>         Some Blu-ray technical info and specifications:
>         Video codec  MPEG2 - MP at ML (4:3 or 16:9), MP at HL (16:9)
>         Video frame size 720×576 25 frames interlaced / 50 fields
>         (4:3/16:9)
>         Max video bitrate     40 Mbit/s
>         **BD-R/RE AV SESF, Part 3 (2018):
>         Video Streams:  max. 15 Mbps VBR (MP at ML) and 24 Mbps (MP at HL)
>         Audio codecs LPCM 1.536 Mbps (16 bit, 2 ch), 2.304 Mbps (20,
>         24 bit)
>         -----------------------
>
>         Terje J. H
>
>
>
>
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