[FFmpeg-trac] #351(undetermined:open): ffv1 frames are not marked as keyframes in mkv

FFmpeg trac at avcodec.org
Sun Jul 17 11:36:16 CEST 2011

#351: ffv1 frames are not marked as keyframes in mkv
Reporter:  dericed                        |       Owner:
    Type:  defect                         |      Status:  open
Priority:  normal                         |   Component:  undetermined
 Version:  unspecified                    |  Resolution:
Keywords:  ffv1 mkv matroska mkvalidator  |  Blocked By:
Blocking:                                 |  Reproduced:  0
Analyzed:  0                              |

Comment (by reimar):

 > aren't all ffv1 frames keyframes

 No, they depend on the arithmetic coding state of previous frames unless
 you use -g 1.
 The matroska encoder opens a new cluster at the latest after 5 MB of data.
 Since your ffv1 frames are very large it can't do that without creating
 some clusters without keyframes.
 This could probably be improved/made configurable in the muxer, but those
 are only warnings after all.

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/351#comment:5>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker

More information about the FFmpeg-trac mailing list