[Ffmpeg-devel] mpeg4 avi, corrupted frames when CODEC_FLAG_TRUNCATED is set

Stefan Lucke stefan
Fri Oct 21 07:21:39 CEST 2005

On Freitag, 21. Oktober 2005 01:53, Rich Felker wrote:
> On Thu, Oct 20, 2005 at 11:16:09PM +0200, Stefan Lucke wrote:
> > Hi,
> > 
> > decoding "star_wreck_in_the_pirkinning_subtitled_xvid.avi" with 
> > CODEC_FLAG_TRUNCATED set, results in corrupted frames.
> > 
> > Is it not allowed to set this flag when frames are not truncated ?
> > Currently we set this in softdevice allways when CODEC_CAP_TRUNCATED
> > is set.
> Using CODEC_FLAG_TRUNCATED is almost always incorrect, and definitely
> correct whenever your input is "framed" (i.e. in a container that
> distinguishes frame boundaries). It should ONLY be used for raw video
> streams with no container, or extremely broken containers when no
> external framer exists to repair the video before sending it to the
> codec. Enabling CODEC_FLAG_TRUNCATED when it's not needed can lead to
> problems in some cases, as you have found. :)

Looks like: ffmpegs internal framer is _incorrect_ as it cannot detect
frameboundaries on complete frames, and that is _correct_ behaviour.

Broken argumentation anyway.

Stefan Lucke

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