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

Rich Felker dalias
Fri Oct 21 01:53:13 CEST 2005

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. :)


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