avfilter_draw_slice() is already called in the end_frame() callback, this avoids multiple calls. This is done by adding a null draw_slice() callback. In particular fix crash occurring with -vf transpose=3,hflip, fix trac issue #371. (cherry picked from commit d9c23a0d5a56488b146eef17a19a9b47643be333)
FFmpeg README ------------- 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.
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