FFMPEG Series

Part 2: Joining and Splitting files

Joining Files

Link: https://trac.ffmpeg.org/wiki/Concatenate

For lossless files of the

same codecs

ffmpeg -i "concat:input1.ts|input2.ts|input3.ts" -c copy output.ts

For mp4 files, using

intermediate files

ffmpeg -i input1.mp4 -c copy intermediate1.ts

ffmpeg -i input2.mp4 -c copy intermediate2.ts

ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy output.ts

Brief explanation of the options used in the command:

-i: input

-c copy: use codec same codecs as input

Splitting Files

Splitting by Duration:

ffmpeg -i input.mp4 -t 00:05:00 output_part1.mp4

ffmpeg -i input.mp4 -t 00:05:00 -ss 00:05:00 output_part2.mp4

Brief explanation of the options used in the command:

-i: Input file

-t: Duration of the output file

-ss: Start position of the output file (optional)

Splitting by Chapters or

Markers:

Use additional scripting to get out chapter marker times, then use

above

C. Splitting by Size:

ffmpeg -i input.mp4 -map 0 -c copy -segment_size 50M -segment_times 1 output_%03d.mp4

Brief explanation of the options used in the command:

-map 0: Select the first stream (video and audio)

-c copy: Copy the stream without re-encoding

(faster)

-segment_size: Size of each output file segment

-segment_times: Number of segments to create

output_%03d.mp4: printf-style pattern for the output

files