random ffmpeg references

gistfile1.txt

# cut
ffmpeg -i movie.mp4 -ss 00:00:03 -t 00:00:08 -async 1 cut.mp4

# ffwd video and audio 10x
ffmpeg -i input.mkv -filter:v "setpts=0.1*PTS" -filter:a "atempo=10.0" output.mkv

# ffwd video only
ffmpeg -i input.mkv -filter:v "setpts=0.1*PTS" -an output.mkv

# convert to DNxHD
ffmpeg -i <input_file> -vcodec dnxhd -b <bitrate> -an output.mov 


https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video

http://www.deb-indus.org/tuto/ffmpeg-howto.htm


ffmpeg -i first_part.mp4 -vcodec dnxhd -b 36M -filter:v "setpts=0.05*PTS" -an output.mov

ffmpeg -i second_part.mp4 -vcodec dnxhd -b 36M output_2.mov