Crash when converting images to theora.

ffmpeg2theora crashes when trying to convert downsampled png images (640x360) of "Big Buck Bunny" to a theora video. The commandline (WIndows cmd, hence the escaping of the % character by using %) is:

ffmpeg2theora ..\big_buck_bunny_%%05d.png -V 1000 -F 24 -o theora_1000_640.ogv

The conversion process starts up, but shows the message:

"[image2 @ 0x3c2b10]MAX_READ_SIZE:5000000 reached"

and then ffmpeg2theora crashes. Trying to convert smaller image files makes ffmpeg2theora convert some of some, but the crash still occurs later on.

For reference, this crash does not occur using ffmpeg with the commandline:

ffmpeg -f image2 -i ..\big_buck_bunny_%%05d.png -vcodec libtheora -b 1000k -r 24 theora_1000_640.ogv