Duration estimate and bitrate calculation wrong when file is over 4Gb

[Peter]

Summary of the bug:
When I concatenate vob files the duration is estimated correctly up to 4Gb then after this the duration and bitrate is wrong.
How to reproduce:

% Correct, file size is 3,919,550,464 bytes containing vobs 1-4
G:\DVD Rip\BATMAN_BEGINS_DISC_1\VIDEO_TS>c:\work\mezzmo\build\current\ffmpeg64\ffmpeg.exe -i g:\batmanbegins-concat.vob
ffmpeg version N-78742-gf477849 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.9.2 (GCC)
  configuration: --enable-memalign-hack --arch=x86_64 --target-os=mingw32 --cross-prefix=x86_64-w64-mingw32- --enable-static --disable-shared --enable-zlib --disable-postproc --prefix=/home/peter/ffmpeg/build/gpl64 --enable-libmp3lame --enable-libx264 --enable-gpl --extra-libs='-lx264 -lpthread -lstdc++' --enable-runtime-cpudetect --extra-cflags=-I/home/peter/cc32/include --extra-ldflags=-L/home/peter/cc64/lib --pkg-config=pkg-config --pkg-config-flags=--static --disable-w32threads --enable-libvpx --enable-libvorbis --enable-libtheora --enable-libx265 --enable-libmfx --enable-gnutls --extra-libs='-lz -lnettle -lhogweed -lgmp -lidn -lws2_32 -lcrypt32'
  libavutil      55. 19.100 / 55. 19.100
  libavcodec     57. 25.101 / 57. 25.101
  libavformat    57. 26.100 / 57. 26.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 36.100 /  6. 36.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
Input #0, mpeg, from 'g:\batmanbegins-concat.vob':
  Duration: 01:16:33.61, start: 0.045622, bitrate: 6826 kb/s
    Stream #0:0[0x1bf]: Data: dvd_nav_packet
    Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv), 720x576 [SAR 64:45 DAR 16:9], max. 8000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:2[0x81]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
    Stream #0:3[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
At least one output file must be specified

Incorrect, file size is 4,993,290,240 bytes containing vobs 1-5
G:\DVD Rip\BATMAN_BEGINS_DISC_1\VIDEO_TS>C:\Users\petere\Downloads\ffmpeg-20160915-6f062eb-win32-static\ffmpeg-20160915-6f062eb-win32-static\bin\ffmpeg.exe -i g:\batmanbegins-concat.vob
ffmpeg version N-81664-g6f062eb Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.4.0 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  libavutil      55. 29.100 / 55. 29.100
  libavcodec     57. 55.101 / 57. 55.101
  libavformat    57. 49.100 / 57. 49.100
  libavdevice    57.  0.102 / 57.  0.102
  libavfilter     6. 62.100 /  6. 62.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  1.100 /  2.  1.100
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mpeg, from 'g:\batmanbegins-concat.vob':
  Duration: 00:20:23.88, start: 0.045622, bitrate: 32639 kb/s
    Stream #0:0[0x1bf]: Data: dvd_nav_packet
    Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:2[0x81]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
    Stream #0:3[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
At least one output file must be specified

Happens with any concatenated vob over 4Gb, just use a file concat tool to merge the vobs.

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

[Carl Eugen Hoyos]

Please test the following command lines on your system to verify your analysis:

$ ffmpeg -f lavfi -i testsrc=pal -target dvd -fs 5G out5.vob
$ ffmpeg -i out5.vob

[Peter]

When ffmpeg encodes a single large vob file it is fine but if I take VTS_01_1.vob and combine it with VTS_01_2.vob, VTS_01_3.vob, VTS_01_4.vob and VTS_01_5.vob using a file concatenation outside of ffmpeg then use ffmpeg to try to read the duration it is wrong. If I call ffmpeg -i on any of the vobs separately the duration and bitrate is correct. It seems to only be an issue when using several vobs combined together.

[Elon Musk]

How are this supposed to work at all if you use dumb concatenation tool?

Closing as invalid.

[Carl Eugen Hoyos]

I believe this is a duplicate of ticket #2084, feel free to test the following:

$ ffmpeg -probesize 5G -analyzeduration 10G -i g:\batmanbegins-concat.vob

[Peter]

I am trying to use -ss to start segmenting from a point in the file but if the duration is not correctly calculated it does not work. I can take vobs 4, 5 and 6 and concatenate them and feed them into ffmpeg and it gets the correct bitrate and duration but if I have 123456 vobs it does not work. Debug output shows:

Non-increasing DTS in stream 0: packet 12 with DTS 9223090561878065151, packet 15 with DTS 340323626

so this looks like it is rolling over.

[Carl Eugen Hoyos]

Did you test with analyzeduration?

[Peter]

Yes I tested with analyzeduration and it took a long time but still did not get the correct duration or bitrate. Upon further investigation it looks like the timestamps reset in vob 5 so the duration is correct in vobs 1, 2, 3, and 4 but 5 starts at 0 again. So if ffmpeg reads the timestamps from the end of the file they will be less than the start and the duration and bitrate will be incorrect.

I tried using the separate vobs and the concat: input but this does not use analyzeduration so it does not find all the subtitles when I use filter complex to burn subtitles.

[Elon Musk]

Why not try concat demuxer instead?

[Peter]

I tried concat demuxer but it does not support analyzeduration so it does not find the subtitle streams when burning subtitles with complex filter

[Elon Musk]

What command you tried with concat demuxer?

[Peter]

ffmpeg -analyzeduration 120000000 -probesize 100M -i "concat:G:\DVD Rip\BATMAN_BEGINS_DISC_1\VIDEO_TS\vts_01_1.vob|G:\DVD Rip\BATMAN_BEGINS_DISC_1\VIDEO_TS\vts_01_2.vob|G:\DVD Rip\BATMAN_BEGINS_DISC_1\VIDEO_TS\vts_01_3.vob|G:\DVD Rip\BATMAN_BEGINS_DISC_1\VIDEO_TS\vts_01_4.vob|G:\DVD Rip\BATMAN_BEGINS_DISC_1\VIDEO_TS\vts_01_5.vob|G:\DVD Rip\BATMAN_BEGINS_DISC_1\VIDEO_TS\vts_01_6.vob|G:\DVD Rip\BATMAN_BEGINS_DISC_1\VIDEO_TS\vts_01_7.vob"

This gives the correct duration but does not find the subtitles.