[FFmpeg-devel] [PATCH]ffplay 2/2: Fix subtitle rendering for special cases

Michael Niedermayer michaelni
Tue Feb 3 00:21:40 CET 2009

On Mon, Feb 02, 2009 at 11:14:53PM +0100, Bj?rn Axelsson wrote:
> >On Sun, Feb 01, 2009 at 11:19:37PM +0100, Bj?rn Axelsson wrote:
> >> Second subtitle-related patch.
> >>
> >> The ffplay.c subtitle renderer (blend_subrect) fails to handle some of
> >> the
> >> special cases with odd widths, odd heights and/or odd positions. For
> >> example it could insert an empty line, wraparound the subrect one pixel
> >> vertically, misalign the UV components and generally make a mess of
> >> things.
> >>
> >> This fix could have been smaller, since I didn't care to track down the
> >> original error in the offset calculations. Instead I replaced the
> >> calculations with an arguably simpler and seemingly more correct
> >> implementation.
> >
> >great, iam in favor of someone rewriting blend_subrect()
> >first see "C?dric Schieli [FFmpeg-devel] [RFC] Alpha support" there is
> >some alpha blend code in there, with which the subtitle case should be
> >merged evetually
> >
> >second the code should be < 1/2 as big as now
> >
> >your choice is between either
> >A. writing a clean and minimal patch to fix the bug (and supply a clear
> >   description of the bug
> >B. provide a new (not diffed) implementation that is smaller, cleaner and
> >   better (1/2 size and attached benchmarks are required)
> or
> C. Do nothing, since I do not want to spend my time debugging complex code
>    that I have already replaced with less buggy and slightly less complex
>    code and you do not want to review a non-minimal fix.

of course, if you dont have the time or will to provide a clean patch
then you dont provide one, case closed.

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

it is not once nor twice but times without number that the same ideas make
their appearance in the world. -- Aristotle
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