Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I am attempting to extract a single frame from a video, with subtitles, using ffmpeg.

I built ffmpeg myself:

sircmpwn@picard ~/sources/bakabt-staging/hennkeo/groups $ ffmpeg
ffmpeg version N-54036-g6c4516d Copyright (c) 2000-2013 the FFmpeg developers
  built on Jun 15 2013 11:56:01 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  configuration: --prefix=/home/sircmpwn/ffmpeg_build --extra-cflags=-I/home/sircmpwn/ffmpeg_build/include --extra-ldflags=-L/home/sircmpwn/ffmpeg_build/lib --bindir=/home/sircmpwn/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      52. 35.101 / 52. 35.101
  libavcodec     55. 16.100 / 55. 16.100
  libavformat    55.  8.102 / 55.  8.102
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 77.101 /  3. 77.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'

And I run this:

sircmpwn@picard ~/sources/bakabt-staging/hennkeo/groups $ ffmpeg -ss 00:09:18 -i horrible.mkv -sn -vf ass=horrible.ass -t 1 -vframes 1 horrible-1.png
ffmpeg version N-54036-g6c4516d Copyright (c) 2000-2013 the FFmpeg developers
  built on Jun 15 2013 11:56:01 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  configuration: --prefix=/home/sircmpwn/ffmpeg_build --extra-cflags=-I/home/sircmpwn/ffmpeg_build/include --extra-ldflags=-L/home/sircmpwn/ffmpeg_build/lib --bindir=/home/sircmpwn/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      52. 35.101 / 52. 35.101
  libavcodec     55. 16.100 / 55. 16.100
  libavformat    55.  8.102 / 55.  8.102
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 77.101 /  3. 77.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, matroska,webm, from 'horrible.mkv':
  Metadata:
    creation_time   : 2013-05-26 13:34:41
  Duration: 00:23:42.11, start: 0.000000, bitrate: 1900 kb/s
    Stream #0:0: Video: h264 (High), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 30.30 fps, 30.30 tbr, 1k tbn, 59.94 tbc (default) (forced)
    Stream #0:1: Audio: aac, 44100 Hz, stereo, fltp (default) (forced)
    Stream #0:2: Subtitle: ssa (default) (forced)
Codec 0x18000 is not in the full list.
    Stream #0:3: Attachment: unknown_codec
    Metadata:
      filename        : OpenSans-Semibold.ttf
      mimetype        : application/x-truetype-font
[Parsed_ass_0 @ 0x3521780] Added subtitle file: 'horrible.ass' (9 styles, 374 events)
Output #0, image2, to 'horrible-1.png':
  Metadata:
    encoder         : Lavf55.8.102
    Stream #0:0: Video: png, rgb24, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 30.30 tbc (default) (forced)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> png)
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.03 bitrate=N/A dup=0 drop=57    
video:364kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.005907%

Which gives me this image. The desired image is something like this one.

share|improve this question

2 Answers 2

Alright, answer was found on #ffmpeg IRC. The problem was the ordering of arguments (unsuprisingly). The correct invocation is:

ffmpeg -i horrible.mkv -ss 00:09:18 -vf ass=horrible.ass -vframes 1 horrible-1.png

I ran into a second problem with fonts, that you might share. ffmpeg won't use fonts from the media you give it, so you first have to install them to your system. I modified a script I was given on IRC that extracts fonts from video files into ~/.fonts for you: https://gist.github.com/SirCmpwn/5789762

share|improve this answer
    
Considering adding usage of embedded fonts as a feature request on the FFmpeg Bug Tracker, or submit a patch to implement this to the ffmpeg-devel mailing-list if interested. –  LordNeckbeard Jun 16 '13 at 1:27

Your command has -sn. -sn basically means "no subtitles". ffmpeg is behaving expectedly.

Search for -sn on the documentation.

Your solution doesn't have -sn.

I may be completely off but this is likely what fixed your first issue.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.