[FFmpeg-devel] [PATCH] lavfi: port mp test source
michaelni at gmx.at
Wed Aug 10 00:42:06 CEST 2011
On Wed, Aug 10, 2011 at 12:28:17AM +0200, Stefano Sabatini wrote:
> On date Tuesday 2011-08-09 21:51:50 +0200, Michael Niedermayer encoded:
> > On Tue, Aug 09, 2011 at 08:59:53PM +0200, Stefano Sabatini wrote:
> > > On date Tuesday 2011-08-09 16:09:47 +0200, Michael Niedermayer encoded:
> > > > On Mon, Aug 08, 2011 at 02:43:15PM +0200, Stefano Sabatini wrote:
> > > > > ---
> > > > > doc/filters.texi | 57 ++++++
> > > > > libavfilter/Makefile | 1 +
> > > > > libavfilter/allfilters.c | 1 +
> > > > > libavfilter/vsrc_mptestsrc.c | 392 ++++++++++++++++++++++++++++++++++++++++++
> > > > > 4 files changed, 451 insertions(+), 0 deletions(-)
> > > > > create mode 100644 libavfilter/vsrc_mptestsrc.c
> > > >
> > > > if it produces same output
> > > > then ok
> > >
> > > After some comparation with showinfo, I had to change M_PI in my code
> > > with 3.141592654, at this point they issue the same output but with
> > > some behavior difference, for mp=test frames with number frame%30 are
> > > skipped, with mptestsrc they are not (which looks more correct).
> > the filter was used to reverse engeneer 8x8 dct based codecs and the
> > all black frames can be used to quickly spot where the different
> > parts of the test patterns start
> I used showinfo for that ;-). Anyway how should look the sequence?
> How about
> TEST1 TEST1 ... TEST1 BLACK TEST2 ... TEST2 BLACK ...
> Consider also that I'm adding the possibility to run separately each
> single test, in that case having a separation frame is pointless.
the way the filter was used was to create a test video that was then
encoded with a closed source encoder that worked only on a different
platform and the resulting bitstream analyzed.
seperate files and fighting with a shitty GUI to encode them X times
is more work than a single video with black frames.
Anyway this filter is probably largely of historic value so it doesnt
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
I hate to see young programmers poisoned by the kind of thinking
Ulrich Drepper puts forward since it is simply too narrow -- Roman Shaposhnik
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