[FFmpeg-devel] Assert failing in libavcodec - ratecontrol.c

Michael Niedermayer michaelni
Sun Jul 15 10:02:17 CEST 2007


On Sun, Jul 15, 2007 at 04:27:15PM +1000, Neil Brown wrote:
> Hi,
>  I have been exploring kdenlive (which uses the MLT framework with
>  uses the ffmpeg libraries) and I have experienced a problem with
>  assertions failing which kills the video rendering process.
>  When I assemble some clips together in kdenlive and ask it to render
>  the final product as an mpeg2 file, it starts rendering OK, but will
>  often crash at the point where one clip ends and the next starts.
>  The crash is due to an assertion failing in ff_rate_estimate_qscale
>  in ratecontrol.c
>  There are 4 places in this code where it says:
>    assert(q>0.0);
>  The second and third of these can both fail. i.e. those that are
>  commented out here:

is this reproduceable with command line ffmpeg? if yes please provide
full uncut output and command line parameters

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Freedom in capitalist society always remains about the same as it was in
ancient Greek republics: Freedom for slave owners. -- Vladimir Lenin
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