FFMpeg toolbox

2017-07-12 2 min read editmentary video · audio · media · ffmpeg

List help (options) for ffmpeg

ffmpeg -h full

How to chunk/segment a video:

ffmpeg -i INPUT.mp4 -acodec copy -f segment -vcodec copy -reset_timestamps 1 -map 0 OUTPUT%d.mp4

Reference: Stack Overflow

Validate/check video for errors:

ffmpeg -v error -i file.avi -f null - 2>error.log

checking multiple videos:

find -name "*.mp4" -exec sh -c "echo '{}' >> errors.log;
ffmpeg -v error -i '{}' -map 0:1 -f null - 2 >> errors.log" \;

Reference: Super User Reference: Stack Overflow

get the meta data for a video using ffprobe

ffprobe -v quiet -print_format json -show_format -show_streams INPUT.mp4

Reference

Concat videos together:

FFmpeg has three concat methods. (in Windows, use double quotes “)

concat protocol

ffmpeg -i 'concat:input1|input2' -codec copy output

concat video filter

ffmpeg -i opening.mkv -i episode.mkv -i ending.mkv \
  -filter_complex '[0:0] [0:1] [1:0] [1:1] [2:0] [2:1] concat=n=3:v=1:a=1 [v] [a]' \
  -map '[v]' -map '[a]' output.mkv

concat demuxer

$ cat mylist.txt
file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'

$ ffmpeg -f concat -i mylist.txt -c copy output

Which one to use

concat protocol: use with formats that support file level concatenation (MPEG-1, MPEG-2 PS, DV). concat filter: use if you need to re-encode such as when applying filters. concat demuxer: use when you want to avoid a re-encode and your format does not support file level concatenation. If in doubt try the concat demuxer.

Disagree? Did I miss something? Comment below .