Den 01.12.2021 18:30, skrev Andrew Randrianasulu:
On Tuesday, November 30, 2021, Terje J. Hanssen <[email protected] <mailto:[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-s... <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..
=========== ffmpeg -i dv28.dv -c:v mpeg2video -pix_fmt yuv422p -refs 1 -bf 2 -b:v 25M -maxrate 25M -minrate 25M -bufsize 45M -muxrate 45M -dc 10 -s 720x576 -aspect 4:3 -c:a pcm_s16be -f vob dv28.mpg Still a lot of ouput messages (some hundreds), tested -bufsize 45M -muxrate 45M (and 50M without change): [vob @ 0x557560237700] packet too large, ignoring buffer limits to mux it [vob @ 0x557560237700] buffer underflow st=1 bufi=6892 size=7680 ........... and lastly frame= 3416 fps=359 q=1.6 Lsize= 446718kB time=00:02:16.60 bitrate=26790.0kbits/s speed=14.4x video:415625kB audio:25620kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.240393% ----------- The format setting "-f vob" in the original script, was maybe the trick that got ffmpeg to "mux" PCM audio into the mpg container, and not to other I tried(?) VOB is usual the DVD-video container where video has max bitrate 9.8 Mbps. I could find again if Blu-ray specification allows "VOB-video" or MPG-video here with high bitrate 25M? ============= tsMuxer As FFMpeg would allow to mux PCM or remux MPG to M2TS, I tested tsMuxer, see the attached screenshot: tsMuxer_SD_M2TS Input file: dv28.mpg Tracs: MPEG-2 video stream and LPCM audio stream Output: M2TS muxing worked, Blu-ray ISO and Blu-ray Folder (tested as working fast and easy) ffmpeg -i dv28.m2ts 2>&1 >/dev/null | egrep "Video|Audio" Stream #0:0[0x1011]: Video: mpeg2video (4:2:2) (HDMV / 0x564D4448), yuv422p(tv, progressive), 720x576 [SAR 16:15 DAR 4:3], 25000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0:1[0x1100]: Audio: pcm_bluray (HDMV / 0x564D4448), 48000 Hz, stereo, s16, 1536 kb/s ffmpeg -i dv28_Blu-ray.iso 2>&1 >/dev/null | egrep "Video|Audio" Stream #0:0[0x1011]: Video: mpeg2video (4:2:2) (HDMV / 0x564D4448), yuv422p(tv, progressive), 720x576 [SAR 16:15 DAR 4:3], 25000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0:1[0x1100]: Audio: pcm_bluray (HDMV / 0x564D4448), 48000 Hz, stereo, s16, 1536 kb/s mediainfo dv28.m2ts | grep Format Format : BDAV Format/Info : Blu-ray Video 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 mediainfo dv28_Blu-ray.iso | grep Format Format : MPEG Video Format version : Version 2 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 tree -h BDMV BDMV ├── [4.0K] AUXDATA ├── [4.0K] BACKUP │ ├── [4.0K] BDJO │ ├── [4.0K] CLIPINF │ │ └── [1.8K] 00000.clpi │ ├── [ 120] index.bdmv │ ├── [ 290] MovieObject.bdmv │ └── [4.0K] PLAYLIST │ └── [ 170] 00000.mpls ├── [4.0K] BDJO ├── [4.0K] CLIPINF │ └── [1.8K] 00000.clpi ├── [ 120] index.bdmv ├── [4.0K] JAR ├── [4.0K] META ├── [ 290] MovieObject.bdmv ├── [4.0K] PLAYLIST │ └── [ 170] 00000.mpls └── [4.0K] STREAM └── [456M] 00000.m2ts 11 directories, 9 files ===========
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..
Good idea. I tried to burn dv28_Blu-ray.iso to a DVD-R disc with the gui burners Brasero and K3b, but both quitted at start with Failure. Suggestion to how customize the previous "CL for HDV to Blu-ray" to burn the now ready made dv28_Blu-ray.iso (with udf included?) and also the BDMV and CERTIFICATE folders to DVD-R/DVD+R and DVD+RW discs? ======== Terje J. H
