ffmpeg goodies

ffmpeg.txt

Lots of verbose output:
ffmpeg -v trace -xerror -err_detect aggressive -debug_ts -progress pipe:1 ...

Generate test files:
ffmpeg -f lavfi -i anullsrc -ac 2 -ar 44100 -t 500ms test.mp3
ffmpeg -f lavfi -i anullsrc -f lavfi -i testsrc -ac 2 -ar 44100 -t 500ms test.mp4
-f lavfi -i sine  
-f lavfi -i anoisesrc  

Test decode:
ffmpeg -i file -f null -

Render audio waveform png
ffmpeg -y -i file.mp3 -filter_complex '[0:a:0]aformat=channel_layouts=mono,showwavespic=s=6400x120:scale=sqrt:colors=black[wave]' -map '[wave]' -frames:v 1 -c:v png wave.png


https://github.com/FFmpeg/FFmpeg/blob/master/libavfilter/avfiltergraph.c#L545