On Tuesday, November 30, 2021, Terje J. Hanssen <[email protected]> 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@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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