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

[Andrew Randrianasulu]

On Tuesday, November 30, 2021, Terje J. Hanssen <terjejhanssen at gmail.com>
wrote:

> Tested the original sample script with minimal changes. A lot of buffer
> underflow messages, but the PCM audio stream was muxed and worked in VLC:
>
> ffmpeg -i dv28.dv -c:v mpeg2video -pix_fmt yuv422p -refs 1 -bf 2 -b:v 25M
> -maxrate 25M -minrate 25M -s 720x576 -aspect 4:3 -c:a pcm_s16be -f vob
> dv28.mpg
>
> [vob @ 0x562322bbb6c0] packet too large, ignoring buffer limits to mux it
> [vob @ 0x562322bbb6c0] buffer underflow st=1 bufi=6876 size=7680
> frame= 3416 fps=374 q=2.2 Lsize=  448010kB time=00:02:16.60
> bitrate=26867.5kbits/s speed=  15x
> video:416900kB audio:25620kB subtitle:0kB other streams:0kB global
> headers:0kB muxing overhead: 1.240520%
>
>
> ffmpeg -i dv28.mpg  2>&1 >/dev/null | egrep "Video|Audio"
>   Stream #0:0[0x1e0]: Video: mpeg2video (4:2:2), yuv422p(tv, progressive),
> 720x576 [SAR 16:15 DAR 4:3], 25000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
>   Stream #0:1[0xa0]: Audio: pcm_dvd, 48000 Hz, stereo, s16, 1536 kb/s
>
>
> mediainfo dv28.mpg | grep Format
> Format                                   : MPEG-PS
> Format                                   : MPEG Video
> Format version                           : Version 2
> Format profile                           : 4:2:2 at Main
> Format settings                          : BVOP
> Format settings, BVOP                    : Yes
> Format settings, Matrix                  : Default
> Format settings, GOP                     : M=3, N=12
> Format                                   : PCM
> Format settings                          : Big / Signed


there is also -muxrate and -bufsize options..
https://stackoverflow.com/questions/44392689/ffmpeg-vbr-cbr-conversion-and-streaming-of-mpeg-2-ts-video-files

try bufsize = muxrate = much bigger (1.8x?) than min/maxrate...

ffmpeg exposes a lot of knobs...

you also can try '-dc 9' 10 or 11 for higher-precision in some mpeg2 math..

for minimising disk loss you probably can prep. few samples with different
encoding/muxing params and burn them all on one disk and see how well/bad
your hw player plays (and seeks) them..


>
>
> Terje J. H
>
>
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