mpeg2 bugs

[downuse]

1. when muxing mpeg-ps(i use -f svcd,all streams are -c copy), the scr is always begin with 28616 either than 0. and according to 18138-2,the scr_ext seems to start with 299.

2. when the video source(vbv_buffer=224k,bitrate=9000k,CBR) is Main@High or Main@High 1440,

it says
buffer underflow
packet too large, ignoring buffer limits to mux it.

3. there isn't a option "sys_header only in first packet" i read the sorce and there is only "sys_header in every N packet"

[Carl Eugen Hoyos]

Please add your (failing) ffmpeg command line together with complete, uncut console output.

[downuse]

Replying to cehoyos:

Please add your (failing) ffmpeg command line together with complete, uncut console output.

ffmpeg started on 2012-12-16 at 01:01:57
Report written to "ffmpeg-20121216-010157.log"
Command line:
ffmpeg2 -loglevel debug -report -y -i 1080.m2v -i 1.mp2 -i 2.mp2 -map 0 -c copy -map 1 -c copy -map 2 -c copy -muxrate 9800k -f svcd 3.mpg
ffmpeg version N-46146-g11d695d Copyright (c) 2000-2012 the FFmpeg developers
  built on Oct 29 2012 18:06:25 with gcc 4.7.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-pthreads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52.  1.100 / 52.  1.100
  libavcodec     54. 69.100 / 54. 69.100
  libavformat    54. 35.100 / 54. 35.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 20.109 /  3. 20.109
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 16.100 /  0. 16.100
  libpostproc    52.  1.100 / 52.  1.100
[mpegvideo @ 003cf460] Format mpegvideo probed with size=32768 and score=51
[mpegvideo @ 003cf460] File position before avformat_find_stream_info() is 0
[mpegvideo @ 003cf460] Probe buffer size limit 5000000 reached
[mpegvideo @ 003cf460] Estimating duration from bitrate, this may be inaccurate
[mpegvideo @ 003cf460] File position after avformat_find_stream_info() is 5012480
Input #0, mpegvideo, from '1080.m2v':
  Duration: 00:04:27.86, bitrate: 9000 kb/s
    Stream #0:0, 135, 1/1200000: Video: mpeg2video (Main), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 1001/60000, 9000 kb/s, 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
[mp3 @ 036ff280] Format mp3 probed with size=4096 and score=51
[mp3 @ 036ff280] File position before avformat_find_stream_info() is 0
[mp3 @ 036ff280] max_analyze_duration 5000000 reached at 5015510
[mp3 @ 036ff280] Estimating duration from bitrate, this may be inaccurate
[mp3 @ 036ff280] File position after avformat_find_stream_info() is 143360
Input #1, mp3, from '1.mp2':
  Duration: 00:04:26.57, start: 0.000000, bitrate: 224 kb/s
    Stream #1:0, 194, 1/14112000: Audio: mp2, 44100 Hz, stereo, s16, 224 kb/s
[mp3 @ 02cbd8a0] Format mp3 probed with size=4096 and score=51
[mp3 @ 02cbd8a0] File position before avformat_find_stream_info() is 0
[mp3 @ 02cbd8a0] max_analyze_duration 5000000 reached at 5015510
[mp3 @ 02cbd8a0] Estimating duration from bitrate, this may be inaccurate
[mp3 @ 02cbd8a0] File position after avformat_find_stream_info() is 143360
Input #2, mp3, from '2.mp2':
  Duration: 00:04:26.57, start: 0.000000, bitrate: 224 kb/s
    Stream #2:0, 194, 1/14112000: Audio: mp2, 44100 Hz, stereo, s16, 224 kb/s
Output #0, svcd, to '3.mpg':
  Metadata:
    encoder         : Lavf54.35.100
    Stream #0:0, 0, 1/90000: Video: mpeg2video, yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 1001/30000, q=2-31, 9000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
    Stream #0:1, 0, 1/90000: Audio: mp2, 44100 Hz, stereo, 224 kb/s
    Stream #0:2, 0, 1/90000: Audio: mp2, 44100 Hz, stereo, 224 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #1:0 -> #0:1 (copy)
  Stream #2:0 -> #0:2 (copy)
Press [q] to stop, [?] for help
[svcd @ 030df560] buffer underflow i=0 bufi=166854 size=177393
...
[svcd @ 030df560] buffer underflow i=0 bufi=194344 size=195609
frame= 1272 fps=0.0 q=-1.0 size=   49816kB time=00:00:42.44 bitrate=9613.7kbits/s    
buffer underflow i=0 bufi=234927 size=262984
[svcd @ 030df560] packet too large, ignoring buffer limits to mux it
[svcd @ 030df560] buffer underflow i=0 bufi=234927 size=262984
[svcd @ 030df560] buffer underflow i=0 bufi=234927 size=262984
[svcd @ 030df560] packet too large, ignoring buffer limits to mux it
[svcd @ 030df560] buffer underflow i=0 bufi=234927 size=262984
[svcd @ 030df560] buffer underflow i=0 bufi=234927 size=262984
[svcd @ 030df560] packet too large, ignoring buffer limits to mux it
[svcd @ 030df560] buffer underflow i=0 bufi=234927 size=262984
...
[svcd @ 030df560] packet too large, ignoring buffer limits to mux it
[svcd @ 030df560] buffer underflow i=0 bufi=238811 size=385254
[svcd @ 030df560] buffer underflow i=0 bufi=238811 size=385254
frame= 2488 fps=2394 q=-1.0 size=   97174kB time=00:01:23.01 bitrate=9589.0kbits/s    
packet too large, ignoring buffer limits to mux it
[svcd @ 030df560] buffer underflow i=0 bufi=238811 size=385254
...
[svcd @ 030df560] buffer underflow i=0 bufi=233494 size=364467
frame= 2509 fps=1626 q=-1.0 size=   98146kB time=00:01:23.72 bitrate=9603.3kbits/s    
buffer underflow i=0 bufi=233494 size=364467
[svcd @ 030df560] packet too large, ignoring buffer limits to mux it
...
[svcd @ 030df560] buffer underflow i=0 bufi=42295 size=152727
frame= 2537 fps=1227 q=-1.0 size=   99312kB time=00:01:24.66 bitrate=9609.5kbits/s    
buffer underflow i=0 bufi=42295 size=152727
[svcd @ 030df560] buffer underflow i=0 bufi=44319 size=152727
...
[svcd @ 030df560] packet too large, ignoring buffer limits to mux it
[svcd @ 030df560] buffer underflow i=0 bufi=248417 size=249802
[svcd @ 030df560] buffer underflow i=0 bufi=613 size=6924
[svcd @ 030df560] buffer underflow i=0 bufi=2637 size=6924
[svcd @ 030df560] buffer underflow i=0 bufi=4661 size=6924
[svcd @ 030df560] buffer underflow i=0 bufi=6685 size=6924
[svcd @ 030df560] buffer underflow i=0 bufi=1780 size=5131
[svcd @ 030df560] buffer underflow i=0 bufi=3804 size=5131
frame= 3114 fps=871 q=-1.0 size=  122008kB time=00:01:43.91 bitrate=9618.3kbits/s    
frame= 4638 fps=1139 q=-1.0 size=  181382kB time=00:02:34.75 bitrate=9601.5kbits/s    
frame= 6258 fps=1368 q=-1.0 size=  244422kB time=00:03:28.80 bitrate=9589.2kbits/s    
frame= 7496 fps=1478 q=-1.0 size=  292678kB time=00:04:10.12 bitrate=9585.8kbits/s    
No more output streams to write to, finishing.
frame= 8009 fps=1527 q=-1.0 Lsize=  312674kB time=00:04:27.23 bitrate=9585.0kbits/s    

video:294285kB audio:14579kB subtitle:0 global headers:0kB muxing overhead 1.233738%
[AVIOContext @ 003cf980] Statistics: 301347701 bytes read, 0 seeks
[AVIOContext @ 02cd5f20] Statistics: 7497124 bytes read, 2 seeks
[AVIOContext @ 0361b740] Statistics: 7497124 bytes read, 2 seeks

[downuse]

the scr_base is always begin with 28616 and the default muxrate estimating are really buged for a long time...why nobody cares?

i uploaded the sample. its muxrate is too large and scr is begin with 28616.

[Carl Eugen Hoyos]

Replying to downuse:

the scr_base is always begin with 28616 and the default muxrate estimating are really buged for a long time...why nobody cares?

Could you tell me a version that works better than current git head? And please point us to the bug report that was (seemingly) ignored if I understand you correctly.

[downuse]

Replying to cehoyos:

Could you tell me a version that works better than current git head? And please point us to the bug report that was (seemingly) ignored if I understand you correctly.

https://ffmpeg.org/trac/ffmpeg/ticket/1487
this ticket is 6 month ago and it works the same.

and after these 3 changes on 2012-10-30, 9 am

740959fdbfbf804ccd8a6e426b1b1ba321fe5cfb
c349177b8cc0deb67df51ec1280c8e5a897a8067
4b7f34a34e4569228627c8954fab08a49203c89c

when use "-i 123.mpg", the video bitrate just don't show any more.

[Carl Eugen Hoyos]

There are a few open questions in ticket #1487 - please answer them there, no need to open a new ticket.