Opened 4 years ago
#6390 new defect
ASS subtitle parser truncates lines at 4095 characters
Reported by: | TellowKrinkle | Owned by: | |
---|---|---|---|
Priority: | normal | Component: | undetermined |
Version: | unspecified | Keywords: | |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Summary of the bug: Any line in an ASS subtitle file that is longer than 4095 characters gets truncated to 4095 characters
How to reproduce: Run ffmpeg with an .ass file with a line > 4095 characters as an input with -c copy to an ass output. The line will have been truncated.
% ffmpeg -report -i subtitleLongerThan4095.ass -c copy subtitleTrimmedTo4095.ass ffmpeg version 3.3 Copyright (c) 2000-2017 the FFmpeg developers built with Apple LLVM version 8.1.0 (clang-802.0.42) configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libass --enable-libmp3lame --enable-libopus --enable-libssh --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --enable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2_1/include/openjpeg-2.1 --enable-vda libavutil 55. 58.100 / 55. 58.100 libavcodec 57. 89.100 / 57. 89.100 libavformat 57. 71.100 / 57. 71.100 libavdevice 57. 6.100 / 57. 6.100 libavfilter 6. 82.100 / 6. 82.100 libavresample 3. 5. 0 / 3. 5. 0 libswscale 4. 6.100 / 4. 6.100 libswresample 2. 7.100 / 2. 7.100 libpostproc 54. 5.100 / 54. 5.100 Splitting the commandline. Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'. Reading option '-i' ... matched as input url with argument 'subtitleLongerThan4095.ass'. Reading option '-c' ... matched as option 'c' (codec name) with argument 'copy'. Reading option 'subtitleTrimmedTo4095.ass' ... matched as output url. Finished splitting the commandline. Parsing a group of options: global . Applying option report (generate a report) with argument 1. Successfully parsed a group of options. Parsing a group of options: input url subtitleLongerThan4095.ass. Successfully parsed a group of options. Opening an input file: subtitleLongerThan4095.ass. [file @ 0x7fa300e003c0] Setting default whitelist 'file,crypto' [ass @ 0x7fa302003c00] Format ass probed with size=2048 and score=100 [ass @ 0x7fa302003c00] Before avformat_find_stream_info() pos: 45831 bytes read:45831 seeks:0 nb_streams:1 [ass @ 0x7fa302003c00] All info found [ass @ 0x7fa302003c00] After avformat_find_stream_info() pos: 45831 bytes read:45831 seeks:0 frames:0 Input #0, ass, from 'subtitleLongerThan4095.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 url subtitleTrimmedTo4095.ass. Applying option c (codec name) with argument copy. Successfully parsed a group of options. Opening an output file: subtitleTrimmedTo4095.ass. [file @ 0x7fa300f015c0] Setting default whitelist 'file,crypto' Successfully opened the file. Output #0, ass, to 'subtitleTrimmedTo4095.ass': Metadata: encoder : Lavf57.71.100 Stream #0:0, 0, 1/100: Subtitle: ass Stream mapping: Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help cur_dts is invalid (this is harmless if it occurs once at the start per stream) No more output streams to write to, finishing. size= 5kB time=00:15:07.05 bitrate= 0.0kbits/s speed=8.25e+06x video:0kB audio:0kB subtitle:43kB other streams:0kB global headers:1kB muxing overhead: unknown Input file #0 (subtitleLongerThan4095.ass): Input stream #0:0 (subtitle): 1 packets read (44288 bytes); Total: 1 packets (44288 bytes) demuxed Output file #0 (subtitleTrimmedTo4095.ass): Output stream #0:0 (subtitle): 1 packets muxed (44288 bytes); Total: 1 packets (44288 bytes) muxed 0 frames successfully decoded, 0 decoding errors [AVIOContext @ 0x7fa300f016a0] Statistics: 0 seeks, 2 writeouts [AVIOContext @ 0x7fa300e004c0] Statistics: 45831 bytes read, 0 seeks
Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.
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An input file with a line longer than 4094 characters