[FFmpeg-trac] #1607(avformat:new): av_seek_frame() without AVSEEK_FLAG_ANY on mpg files returns success without seeking to a keyframe

FFmpeg trac at avcodec.org
Tue Aug 7 10:44:29 CEST 2012


#1607: av_seek_frame() without AVSEEK_FLAG_ANY on mpg files returns success
without seeking to a keyframe
------------------------------------+------------------------------------
             Reporter:  mbradshaw   |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+------------------------------------

Comment (by cehoyos):

 And there is a second possibility how not to extract non-keyframes:
 $ ffmpeg -ss 1 -i mpeg2video_seek_to_non_keyframe.mpg -vcodec copy
 -vframes 1 out.m2v
 $ ffmpeg -ss 2 -i mpeg2video_seek_to_non_keyframe.mpg -vcodec copy
 -vframes 1 out.m2v
 $ ffmpeg -ss 3 -i mpeg2video_seek_to_non_keyframe.mpg -vcodec copy
 -vframes 1 out.m2v
 $ ffmpeg -ss 4 -i mpeg2video_seek_to_non_keyframe.mpg -vcodec copy
 -vframes 1 out.m2v
 $ ffmpeg -ss 5 -i mpeg2video_seek_to_non_keyframe.mpg -vcodec copy
 -vframes 1 out.m2v
 $ ffmpeg -ss 6 -i mpeg2video_seek_to_non_keyframe.mpg -vcodec copy
 -vframes 1 out.m2v
 $ ffmpeg -ss 7 -i mpeg2video_seek_to_non_keyframe.mpg -vcodec copy
 -vframes 1 out.m2v
 $ ffmpeg -ss 8 -i mpeg2video_seek_to_non_keyframe.mpg -vcodec copy
 -vframes 1 out.m2v
 $ ffmpeg -ss 9 -i mpeg2video_seek_to_non_keyframe.mpg -vcodec copy
 -vframes 1 out.m2v

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1607#comment:11>
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