#11642: ffmpeg -ss -c copy causes MP4 vobsub timestamps to be incorrectly
shifted
----------------------------------+----------------------------------
Reporter: runderwo | Type: defect
Status: new | Priority: normal
Component: ffmpeg | Version: 7.1
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
----------------------------------+----------------------------------
Summary of the bug:
Changing the start time of a video causes the start time of the first
vobsub subtitle to be moved to timestamp 0 in the file (i.e., the first
subtitle is immediately rendered when the file is played and all the rest
of the subtitles show at the wrong time).
The correct behavior should be that the subtitle time offsets are shifted
by the same amount of time as the rest of the container data.
How to reproduce:
{{{
$ ffmpeg -ss 129 -i 02.mp4 -map 0 -c copy out2.mp4
ffmpeg version 7.1.1-1ubuntu1.1 Copyright (c) 2000-2025 the FFmpeg
developers
built with gcc 14 (Ubuntu 14.2.0-19ubuntu2)
configuration: --prefix=/usr --extra-version=1ubuntu1.1
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
--disable-stripping --disable-libmfx --disable-omx --enable-gnutls
--enable-libaom --enable-libass --enable-libbs2b --enable-libcdio
--enable-libcodec2 --enable-libdav1d --enable-libflite --enable-
libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang
--enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame
--enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-
libopus --enable-librubberband --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp
--enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
--enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-
libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-
chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-
libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-
libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-
libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-
libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e
--enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
WARNING: library configuration mismatch
avcodec configuration: --prefix=/usr --extra-version=1ubuntu1.1
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
--disable-stripping --disable-libmfx --disable-omx --enable-gnutls
--enable-libaom --enable-libass --enable-libbs2b --enable-libcdio
--enable-libcodec2 --enable-libdav1d --enable-libflite --enable-
libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang
--enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame
--enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-
libopus --enable-librubberband --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp
--enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
--enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-
libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-
chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-
libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-
libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-
libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-
libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e
--enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
--enable-version3 --disable-doc --disable-programs --disable-static
--enable-libaribb24 --enable-libopencore_amrnb --enable-libopencore_amrwb
--enable-libtesseract --enable-libvo_amrwbenc --enable-libsmbclient
libavutil 59. 39.100 / 59. 39.100
libavcodec 61. 19.101 / 61. 19.101
libavformat 61. 7.100 / 61. 7.100
libavdevice 61. 3.100 / 61. 3.100
libavfilter 10. 4.100 / 10. 4.100
libswscale 8. 3.100 / 8. 3.100
libswresample 5. 3.100 / 5. 3.100
libpostproc 58. 3.100 / 58. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '02.mp4':
Metadata:
major_brand : mp42
minor_version : 512
compatible_brands: mp42dby1iso2avc1mp41
creation_time : 2025-06-21T03:50:09.000000Z
encoder : HandBrake 1.9.2 2025022300
Duration: 02:19:34.64, start: 0.000000, bitrate: 5401 kb/s
Chapters:
Chapter #0:0: start 0.000000, end 133.160000
Metadata:
title : Chapter 1
Chapter #0:1: start 133.160000, end 409.760000
Metadata:
title : Chapter 2
Chapter #0:2: start 409.760000, end 802.000000
Metadata:
title : Chapter 3
Chapter #0:3: start 802.000000, end 1025.400000
Metadata:
title : Chapter 4
Chapter #0:4: start 1025.400000, end 1295.560000
Metadata:
title : Chapter 5
Chapter #0:5: start 1295.560000, end 1723.120000
Metadata:
title : Chapter 6
Chapter #0:6: start 1723.120000, end 2093.720000
Metadata:
title : Chapter 7
Chapter #0:7: start 2093.720000, end 2397.760000
Metadata:
title : Chapter 8
Chapter #0:8: start 2397.760000, end 2754.400000
Metadata:
title : Chapter 9
Chapter #0:9: start 2754.400000, end 3007.960000
Metadata:
title : Chapter 10
Chapter #0:10: start 3007.960000, end 3371.680000
Metadata:
title : Chapter 11
Chapter #0:11: start 3371.680000, end 3909.080000
Metadata:
title : Chapter 12
Chapter #0:12: start 3909.080000, end 4421.360000
Metadata:
title : Chapter 13
Chapter #0:13: start 4421.360000, end 4942.280000
Metadata:
title : Chapter 14
Chapter #0:14: start 4942.280000, end 5521.960000
Metadata:
title : Chapter 15
Chapter #0:15: start 5521.960000, end 6031.480000
Metadata:
title : Chapter 16
Chapter #0:16: start 6031.480000, end 6438.440000
Metadata:
title : Chapter 17
Chapter #0:17: start 6438.440000, end 6671.440000
Metadata:
title : Chapter 18
Chapter #0:18: start 6671.440000, end 7214.200000
Metadata:
title : Chapter 19
Chapter #0:19: start 7214.200000, end 7651.840000
Metadata:
title : Chapter 20
Chapter #0:20: start 7651.840000, end 7907.760000
Metadata:
title : Chapter 21
Chapter #0:21: start 7907.760000, end 8111.240000
Metadata:
title : Chapter 22
Chapter #0:22: start 8111.240000, end 8302.560000
Metadata:
title : Chapter 23
Chapter #0:23: start 8302.560000, end 8373.160000
Metadata:
title : Chapter 24
Chapter #0:24: start 8373.160000, end 8374.600000
Metadata:
title : Chapter 25
Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661),
yuv420p(tv, smpte170m/bt470bg/bt709, progressive), 698x576 [SAR 16:15 DAR
349:270], 4680 kb/s, 25 fps, 25 tbr, 90k tbn (default)
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : VideoHandler
vendor_id : [0][0][0][0]
Stream #0:1[0x2](deu): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 159 kb/s (default)
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : Stereo
vendor_id : [0][0][0][0]
Stream #0:2[0x3](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 159 kb/s
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : Stereo
vendor_id : [0][0][0][0]
Stream #0:3[0x4](deu): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo,
fltp, 192 kb/s
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : Stereo
vendor_id : [0][0][0][0]
Side data:
audio service type: main
Stream #0:4[0x5](eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo,
fltp, 192 kb/s
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : Stereo
vendor_id : [0][0][0][0]
Side data:
audio service type: main
Stream #0:5[0x6](deu): Subtitle: dvd_subtitle (dvdsub) (mp4s /
0x7334706D), 720x576, 0 kb/s (default)
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : SubtitleHandler
Stream #0:6[0x7](eng): Data: bin_data (text / 0x74786574)
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : SubtitleHandler
File 'out2.mp4' already exists. Overwrite? [y/N] Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Stream #0:2 -> #0:2 (copy)
Stream #0:3 -> #0:3 (copy)
Stream #0:4 -> #0:4 (copy)
Stream #0:5 -> #0:5 (copy)
Stream #0:6 -> #0:6 (copy)
[mp4 @ 0x64ce9d2f68c0] track 3: codec frame size is not set
[mp4 @ 0x64ce9d2f68c0] track 4: codec frame size is not set
Output #0, mp4, to 'out2.mp4':
Metadata:
major_brand : mp42
minor_version : 512
compatible_brands: mp42dby1iso2avc1mp41
encoder : Lavf61.7.100
Chapters:
Chapter #0:0: start 0.000000, end 4.160000
Metadata:
title : Chapter 1
Chapter #0:1: start 4.160000, end 280.760000
Metadata:
title : Chapter 2
Chapter #0:2: start 280.760000, end 673.000000
Metadata:
title : Chapter 3
Chapter #0:3: start 673.000000, end 896.400000
Metadata:
title : Chapter 4
Chapter #0:4: start 896.400000, end 1166.560000
Metadata:
title : Chapter 5
Chapter #0:5: start 1166.560000, end 1594.120000
Metadata:
title : Chapter 6
Chapter #0:6: start 1594.120000, end 1964.720000
Metadata:
title : Chapter 7
Chapter #0:7: start 1964.720000, end 2268.760000
Metadata:
title : Chapter 8
Chapter #0:8: start 2268.760000, end 2625.400000
Metadata:
title : Chapter 9
Chapter #0:9: start 2625.400000, end 2878.960000
Metadata:
title : Chapter 10
Chapter #0:10: start 2878.960000, end 3242.680000
Metadata:
title : Chapter 11
Chapter #0:11: start 3242.680000, end 3780.080000
Metadata:
title : Chapter 12
Chapter #0:12: start 3780.080000, end 4292.360000
Metadata:
title : Chapter 13
Chapter #0:13: start 4292.360000, end 4813.280000
Metadata:
title : Chapter 14
Chapter #0:14: start 4813.280000, end 5392.960000
Metadata:
title : Chapter 15
Chapter #0:15: start 5392.960000, end 5902.480000
Metadata:
title : Chapter 16
Chapter #0:16: start 5902.480000, end 6309.440000
Metadata:
title : Chapter 17
Chapter #0:17: start 6309.440000, end 6542.440000
Metadata:
title : Chapter 18
Chapter #0:18: start 6542.440000, end 7085.200000
Metadata:
title : Chapter 19
Chapter #0:19: start 7085.200000, end 7522.840000
Metadata:
title : Chapter 20
Chapter #0:20: start 7522.840000, end 7778.760000
Metadata:
title : Chapter 21
Chapter #0:21: start 7778.760000, end 7982.240000
Metadata:
title : Chapter 22
Chapter #0:22: start 7982.240000, end 8173.560000
Metadata:
title : Chapter 23
Chapter #0:23: start 8173.560000, end 8244.160000
Metadata:
title : Chapter 24
Chapter #0:24: start 8244.160000, end 8245.600000
Metadata:
title : Chapter 25
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
smpte170m/bt470bg/bt709, progressive), 698x576 [SAR 16:15 DAR 349:270],
q=2-31, 4680 kb/s, 25 fps, 25 tbr, 90k tbn (default)
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : VideoHandler
vendor_id : [0][0][0][0]
Stream #0:1(deu): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 159 kb/s (default)
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : Stereo
vendor_id : [0][0][0][0]
Stream #0:2(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 159 kb/s
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : Stereo
vendor_id : [0][0][0][0]
Stream #0:3(deu): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo,
fltp, 192 kb/s
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : Stereo
vendor_id : [0][0][0][0]
Side data:
audio service type: main
Stream #0:4(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo,
fltp, 192 kb/s
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : Stereo
vendor_id : [0][0][0][0]
Side data:
audio service type: main
Stream #0:5(deu): Subtitle: dvd_subtitle (mp4s / 0x7334706D), 720x576, 0
kb/s (default)
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : SubtitleHandler
Stream #0:6(eng): Data: bin_data (gpmd / 0x646D7067)
Metadata:
creation_time : 2025-06-21T03:50:09.000000Z
handler_name : SubtitleHandler
[..]
frame=206142 fps=4521 q=-1.0 Lsize= 5432964KiB time=01:57:28.39
bitrate=6314.5kbits/s speed= 155x
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11642>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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