[FFmpeg-trac] #5291(undetermined:new): Wrong parsing when start time > end time in subtitles (.ass)
FFmpeg
trac at avcodec.org
Sat Mar 5 23:24:42 CET 2016
#5291: Wrong parsing when start time > end time in subtitles (.ass)
-------------------------------------+-------------------------------------
Reporter: miflinak | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug: .ass subtitles parsed wrong when dialog start time is
larger than dialog end time.
How to reproduce:
Test file (test.ass):
{{{
[Script Info]
Title: Default Aegisub file
ScriptType: v4.00+
PlayResX: 1280
PlayResY: 720
PlayDepth: 16
Timer: 100,0000
WrapStyle: 1
YCbCr Matrix: TV.709
[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour,
OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX,
ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL,
MarginR, MarginV, Encoding
Style:
Default,Arial,45,&H00FFFFFF,&H00005BFF,&H00010101,&HBE1F0C05,-1,0,0,0,90,100,0,0,1,2,0,2,10,10,15,1
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect,
Text
Dialogue: 1,0:02:11.52,0:02:11.49,Default,,0,0,0,fx,test
}}}
And then:
{{{
ffmpeg -i test.ass -f webvtt -nostats -loglevel 0 -
WEBVTT
02:11.520 --> 1193:04:58.786
<b>test</b>
}}}
As you see dialog with duration 0 ms converts to dialog with duration 1193
hours.
With loglevel 999 (but I think it's useless):
{{{
ffmpeg -i test.ass -f webvtt -loglevel 999 -
ffmpeg version N-76944-g15206ff Copyright (c) 2000-2015 the FFmpeg
developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-
avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3
--enable-libopencore-amrnb --enable-libopencore-amrwb --disable-
decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libdcadec
--enable-libfreetype --enable-libx264 --enable-libx265 --enable-libfdk-aac
--enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx
--enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr
--enable-libxvid --enable-libvo-aacenc --enable-libvidstab
libavutil 55. 9.100 / 55. 9.100
libavcodec 57. 16.101 / 57. 16.101
libavformat 57. 19.100 / 57. 19.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 17.100 / 6. 17.100
libavresample 3. 0. 0 / 3. 0. 0
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Splitting the commandline.
Reading option '-i' ... matched as input file with argument 'test.ass'.
Reading option '-f' ... matched as option 'f' (force format) with argument
'webvtt'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging
level) with argument '999'.
Reading option '-' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument 999.
Successfully parsed a group of options.
Parsing a group of options: input file test.ass.
Successfully parsed a group of options.
Opening an input file: test.ass.
Probing ass score:100 size:660
Probing lrc score:5 size:660
[ass @ 0x2ee93c0] Format ass probed with size=2048 and score=100
[ass @ 0x2ee93c0] Before avformat_find_stream_info() pos: 660 bytes
read:660 seeks:0
[ass @ 0x2ee93c0] All info found
[ass @ 0x2ee93c0] 0: start_time: -9223372036854.775 duration:
-9223372036854.775
[ass @ 0x2ee93c0] stream: start_time: -9223372036854.775 duration:
-9223372036854.775 bitrate=0 kb/s
[ass @ 0x2ee93c0] After avformat_find_stream_info() pos: 660 bytes
read:660 seeks:0 frames:0
Input #0, ass, from 'test.ass':
Duration: N/A, bitrate: N/A
Stream #0:0, 0, 1/100: Subtitle: ass
Successfully opened the file.
Parsing a group of options: output file -.
Applying option f (force format) with argument webvtt.
Successfully parsed a group of options.
Opening an output file: -.
Successfully opened the file.
WEBVTT
Output #0, webvtt, to 'pipe:':
Metadata:
encoder : Lavf57.19.100
Stream #0:0, 0, 1/1000: Subtitle: webvtt
Metadata:
encoder : Lavc57.16.101 webvtt
Stream mapping:
Stream #0:0 -> #0:0 (ass (native) -> webvtt (native))
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per
stream)
02:11.520 --> 1193:04:58.786
<b>test</b>
No more output streams to write to, finishing.
size= 0kB time=00:02:11.52 bitrate= 0.0kbits/s
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 345.454559%
Input file #0 (test.ass):
Input stream #0:0 (subtitle): 1 packets read (26 bytes); 1 frames
decoded;
Total: 1 packets (26 bytes) demuxed
Output file #0 (pipe:):
Output stream #0:0 (subtitle): 1 frames encoded; 1 packets muxed (11
bytes);
Total: 1 packets (11 bytes) muxed
1 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x2eead20] Statistics: 0 seeks, 2 writeouts
[AVIOContext @ 0x2ef1f40] Statistics: 660 bytes read, 0 seeks
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5291>
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