ps1 issue 4: corruptor temp file plays but not non-temp file

[bturkus]

appears to me that the call to transcode the temp file to prores fails...not sure exactly how we're doing this in bash but we should check

[nkrabben]

patched by adding -max_muxing_queue_size 512 in 0be8dab
based on https://trac.ffmpeg.org/ticket/6375

512 was the lowest value i could put in to avoid the issue

still doesn't work quite right, video is frozen for 5 seconds to start