[FFmpeg-devel] [PATCH] Add null video filter
Sun Oct 18 12:25:41 CEST 2009
On date Thursday 2009-10-08 00:18:25 +0200, Michael Niedermayer encoded:
> On Thu, Oct 08, 2009 at 12:04:48AM +0200, Stefano Sabatini wrote:
> > On date Wednesday 2009-10-07 23:45:19 +0200, Michael Niedermayer encoded:
> > > On Wed, Oct 07, 2009 at 09:42:21PM +0200, Stefano Sabatini wrote:
> > > > Hi all,
> > > >
> > > > in attachment a zen null video filter.
> > > >
> > > > Pedagogically useful.
> > >
> > > it looks like it would break direct rendering, not passing
> > > get_video_buffer() through but rather ending in a malloc()
> > That's true if we assume that this patch depends on the
> > get_video_buffer() change patch.
> > Patch updated accordingly.
> > Regards.
> > --
> > FFmpeg = Faboulous and Furious Mortal Peaceful Eccentric Game
> > doc/vfilters.texi | 4 +++
> > libavfilter/Makefile | 1
> > libavfilter/allfilters.c | 1
> > libavfilter/vf_null.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++
> > 4 files changed, 62 insertions(+)
> > be718603bac4691e58b1a2ab660a3b1db00073fe lavfi-add-vf-null.patch
> probably ok if extensively tested (for example benchmarks that it does not
> cause slowdown which would be an indication of extra memcpy being done
With ffplay I didn't noticed significant slowdowns even with an insane
number of null filters (256).
But I noticed some slowdowns with ffmpeg, even with a relatively small
number of null filters:
With 32 null filters the process seems to hangs, a quick inspection
with gdb revealed that the processing hangs in avfilter_poll_frame(),
anyway since the problem is not related to the present filter I
FFmpeg = Fostering & Faithless Maxi Powerful Everlasting Genius
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