#2568 closed defect (invalid)
ffprobe is unreliable when processing random text files
Reported by: | ahthovaikied | Owned by: | |
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Priority: | normal | Component: | avformat |
Version: | git-master | Keywords: | text |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
FFprobe is unreliable when processing small text files that are not media files: it reports random codecs instead of rejecting the files.
For example with a text file containing the lines:
1. Restless 2. Enter 3. Pearls of light 4. Deep Within 5. Gatekeeper 6. Grace 7. Blooded 8. Candles
I get:
$ ./ffprobe -loglevel debug text_file.txt ffprobe version N-53047-ge751481 Copyright (c) 2007-2013 the FFmpeg developers built on May 14 2013 19:38:50 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5) configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-x11grab --disable-encoder=vorbis --disable-encoder=aac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfaac --enable-libfdk-aac --enable-librtmp --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-libopus --disable-runtime-cpudetect --disable-ffserver --disable-debug --cpu=corei7 libavutil 52. 31.100 / 52. 31.100 libavcodec 55. 9.100 / 55. 9.100 libavformat 55. 7.100 / 55. 7.100 libavdevice 55. 0.100 / 55. 0.100 libavfilter 3. 65.100 / 3. 65.100 libswscale 2. 3.100 / 2. 3.100 libswresample 0. 17.102 / 0. 17.102 libpostproc 52. 3.100 / 52. 3.100 [tty @ 0x28fa260] Format tty probed with size=2048 and score=50 [tty @ 0x28fa260] File position before avformat_find_stream_info() is 0 [tty @ 0x28fa260] File position after avformat_find_stream_info() is 106 Input #0, tty, from 'text_file.txt': Duration: 00:00:00.04, bitrate: 21 kb/s Stream #0:0, 1, 1/25: Video: ansi, pal8, 640x400, 1/25, 25 fps, 25 tbr, 25 tbn, 25 tbc [AVIOContext @ 0x2902920] Statistics: 106 bytes read, 0 seeks
I tried with ffmpeg:
- 1.2.1
- from git today (version.sh outputs N-53047-ge751481).
I'm on Ubuntu 12.04 64bits, the configure options I use for the custom build can be found above.
Change History (6)
comment:1 by , 12 years ago
Version: | unspecified → git-master |
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comment:2 by , 12 years ago
Resolution: | → invalid |
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Status: | new → closed |
comment:3 by , 12 years ago
Component: | FFprobe → avformat |
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Keywords: | ffprobe removed |
comment:4 by , 12 years ago
Wow, I didn't know that ffmpeg could "play" text files.
A few questions though:
- why are some text files rejected (as expected), and some others identified as video files (very counter intuitively)?
- ffprobe is described as "media prober", so what does the fact that ffmpeg can play a text file has anything to do with the nature of this file which is certainly not a video with a 640x400 resolution?
Thanks
comment:5 by , 12 years ago
Yes, its also a typewriter. You can freely ignore files that are probed as tty files and have codec set to ansi.
comment:6 by , 12 years ago
Thanks for the tip, I'm using ffprobe to probe thousands of files from Python scripts so that info is definitely useful.
Thanks again and have a nice day :)
That is normal file, and ffmpeg will create watchable video for such files.