[FFmpeg-devel] bug: snow encoder pred_block assertion. (sample data on upload.ffmpeg.org)
Wed Jul 1 22:27:12 CEST 2009
Hey guys... Im jumping in at the deep end, and attempting to solve the
problem with the following assertion.
ffmpeg: libavcodec/snow.c:2357: pred_block: Assertion `b_w>1 && b_h>1'
Before I spend too much time on this, can anyone confirm that it is indeed a
With some failing sample media, this assertion fails on all versions of
ffmpeg i can get my hands on, right from todays svn (AMD64 Linux),
to very old unofficial win32 builds.
It doesnt seem to be a problem with the unusual resolution of the sample
media, as some sample data of the same res works fine.
I am converting a png flipbook animation to a snow video in a nut container
with the following command.
/usr/local/bin/ffmpeg -i snow_encoder_pred_block_assertion/gold%02d.png
-strict -2 -pix_fmt yuv420p -an -qscale 2.0 -f nut -vcodec snow gold.nut
I have uploaded some sample data to
As for solving this.. can anyone give me a kickstart in the correct
direction, like i say, im jumping right in at the deep end.
Thankyou very much for any help/direction.
More information about the ffmpeg-devel