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

[Andrew Randrianasulu]

On Monday, November 29, 2021, Terje J. Hanssen <terjejhanssen at gmail.com>
wrote:

>
>
> 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."
>
>
https://superuser.com/questions/907933/correct-aspect-ratio-without-re-encoding-video-file

===
for MPEG-2, -aspect is useless; you need to use -bsf:v
mpeg2_metadata=display_aspect_ratio=4/3 (the only valid values are 4/3,
16/9, 221/100). Even this might not work {...}
====

try to experiment..




>
>> '-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
>>
>>
>>
>>
>>     --     Cin mailing list
>>     Cin at lists.cinelerra-gg.org <mailto:Cin at lists.cinelerra-gg.org>
>>     https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>     <https://lists.cinelerra-gg.org/mailman/listinfo/cin>
>>
>>
>
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