ffmpeg -f v4l2 -video_size 720x480 -framerate 30 -thread_queue_size 471040 -i /dev/video0 -f alsa -thread_queue_size 480000 -i default -c:v libx264 -preset medium -crf 11 -c:a ac3 -b:a 384k -y /media/me/test1.mp4 -f matroska -c copy - | ffplay -f matroska -x 1440 -y 1080 -

The recorded file is very good quality. My -crf over-rides the preset, and I prefer the AC3 audio. But after the Natroska recode and resize for ffplay the on-screen display is choppy. But it works. Is there a different format I could use for ffplay that would not be choppy?