avcodec/flashsvenc: Change check for first frame

AVCodecContext.frame_number is actually only incremented
in case encoding was successfull; if e.g. the ff_alloc_packet()
below fails, it won't be incremented and therefore it is possible
for the previous_frame buffer to be allocated for multiple
first frames, leaking every one except the last.
So check for whether there already is a previous frame instead.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

0 files changed, 0 insertions, 0 deletions