[vlc-devel] [PATCH] Fix glitching at start of stream playback

Rafaël Carré funman at videolan.org
Tue Mar 18 15:21:39 CET 2014


On 03/18/14 14:28, Alex Woods wrote:
> This patch fixes a problem that occurs at the start of playback of MPEG2
> streams.  The symptom is that an initial good frame will display and
> then the video appears to skip back a frame or two and some
> macroblocking is observed. The stream then plays correctly. This is
> really obvious when switching between SAPed multicast streams, where
> you're jumping right in to a lot of movement and probably not starting
> with an I frame.
> The issue appears to be some code introduced way back in 2004 (commit
> eaefb8508dba22fb04193241347a072caac34cf1) which resubmits data to the
> video codec. The commit notes suggest it was to avoid dropping the first
> I frame, but I see no obviously lost I frames after removing the code
> with my test samples. Presumably this was a work-around for a libavcodec
> issue that is no longer required.
> Therefore, this patch basically just reverts the 2004 commit in its
> current form.


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