can you provide access to that input file, with that we might be able to figure out whats causing the problem, can you also try:
ffmpeg2theora-0.27.exe --optimize --speedlevel 0 -a 1 -- aspect 16:9 -x 720 -y 480 --nosubtitles Input_file_720p_x264_AAC_SRT_in_mkv
and let me know if that also crashes.
can you provide access to that input file, with that we might be able to
figure out whats causing the problem, can you also try:
ffmpeg2theora- 0.27.exe --optimize --speedlevel 0 -a 1 -- aspect 16:9 720p_x264_ AAC_SRT_ in_mkv
-x 720 -y 480 --nosubtitles Input_file_
and let me know if that also crashes.