[FFmpeg-trac] #7855(undetermined:new): Last subtitle in MP4 is displayed forever
FFmpeg
trac at avcodec.org
Thu Apr 18 08:29:42 EEST 2019
#7855: Last subtitle in MP4 is displayed forever
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Reporter: fumoboy007 | Type: defect
Status: new | Priority: normal
Component: undetermined | Version: 4.1
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
Decoding the last tx3g subtitle in an MP4 produces an incorrect duration,
causing the subtitle to stay on-screen until the end of the media.
How to reproduce:
Play the attached file in VLC. Also, run the following command and compare
the outputted subtitle file with the original subtitle file (also
attached).
{{{
$ ffmpeg -i Permanent\ Last\ Subtitle.mp4 -map 0:s:0 FFmpeg\ Output.srt
ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developers
built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1_1 --enable-shared
--enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-
avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay
--enable-gpl --enable-libmp3lame --enable-libopus --enable-libsnappy
--enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264
--enable-libx265 --enable-libxvid --enable-lzma --enable-libfreetype
--enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-librtmp --enable-libspeex --enable-videotoolbox
libavutil 56. 22.100 / 56. 22.100
libavcodec 58. 35.100 / 58. 35.100
libavformat 58. 20.100 / 58. 20.100
libavdevice 58. 5.100 / 58. 5.100
libavfilter 7. 40.101 / 7. 40.101
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 3.100 / 5. 3.100
libswresample 3. 3.100 / 3. 3.100
libpostproc 55. 3.100 / 55. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Permanent Last Subtitle.mp4':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: mp41mp42isom
creation_time : 2019-04-18T05:09:42.000000Z
Duration: 00:01:05.04, start: 0.000000, bitrate: 431 kb/s
Stream #0:0(deu): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
smpte170m), 640x360, 289 kb/s, 23.97 fps, 23.98 tbr, 24k tbn, 48k tbc
(default)
Metadata:
creation_time : 2019-04-18T05:09:42.000000Z
handler_name : Core Media Video
encoder : AVC Coding
Stream #0:1(deu): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 137 kb/s (default)
Metadata:
creation_time : 2019-04-18T05:09:42.000000Z
handler_name : Core Media Audio
Stream #0:2(eng): Subtitle: mov_text (tx3g / 0x67337874), 640x54, 0
kb/s (default)
Metadata:
rotate : 0
creation_time : 2019-04-18T05:10:26.000000Z
Output #0, srt, to 'FFmpeg Output.srt':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: mp41mp42isom
encoder : Lavf58.20.100
Stream #0:0(eng): Subtitle: subrip (srt), 640x54 (default)
Metadata:
encoder : Lavc58.35.100 srt
creation_time : 2019-04-18T05:10:26.000000Z
Stream mapping:
Stream #0:2 -> #0:0 (mov_text (native) -> subrip (srt))
Press [q] to stop, [?] for help
size= 0kB time=00:00:45.25 bitrate= 0.0kbits/s speed=3.59e+04x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 79.069771%
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7855>
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