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jnk_cutter

A simple bash script for splitting a video file using ffmpeg into sections, saving each section in an individual file, and also extracting audio from each video into a separate "mp3" (320kbps bitrate is enforced).

Note: the script splits the video and transcodes the sections to 1280x720p but the original audio is preserved. You can override this behaviour by using --no-transcode flag.

By default, the script skips every other section starting from the first one. You can override this behaviour by using --no-skip flag. For example if you pass 2 break times (with -t flag) to the script, sections 1 and 3 will be skipped as shown below:

time:     0-----------------t-----------------t-----------------(end)
sections: |----section 1----|----section 2----|----section 3----|

Installation

jnk_cutter is a simple script and just needs the following tools to work:

bash
ffmpeg
bc (optional)

You should be able to run the script in any environment with bash and ffmpeg support. We test the script on Ubuntu 22.04 and Cygwin 3.4.

Usage

See help

./jnk_cutter.sh -h

Just validate the input flags and print the ffmpeg commands but do not execute them

./jnk_cutter.sh --dry-run

Cut input.mp4 into a single section: form the 1-min mark to the end. The output files will be named: input_1.mp3, input_1.mp4

./jnk_cutter.sh -i input.mp4 -t 00:01:00

Cut input.mp4 into a single section: form the 1-min mark to the end (similar to the example above). Depending on the frequency of key frames in the original video, a few seconds at the start of output video may appear frozen/corrupted!

./jnk_cutter.sh -i input.mp4 -t 00:01:00 --no-transcode

Cut input.mp4 into two sections: from the start to the 1-min mark and form the 1-min mark to the end. The output files will be named: input_1.mp3, input_1.mp4, input_2.mp3, input_2.mp4

./jnk_cutter.sh -i input.mp4 -t 00:01:00 --no-skip

Same as the above but change the output file names to output_*.mp3/mp4. You can define the prefix with a different file extension if you want to change the data container e.g. --output-prefix=output.mkv

./jnk_cutter.sh -i input.mp4 --output-prefix=output -t 00:01:00 --no-skip

Same as the above but change the output file names to file1.mp3/mp4 & file2.mp3/mp4. (File names which include space or single quotation, must be enclosed in double quotation marks as: --output-files="file 1,file's2") You can define the filenames with a different extension if you want to change the data container e.g. --output-files=file1.mkv,file2.mp4

./jnk_cutter.sh -i input.mp4 --output-files=file1,file2 -t 00:01:00 --no-skip

Split the files by defining multiple break points. (timing of the output files: start -> 01:00, 01:00 -> 02:00, 02:00 -> 03:00, 03:00 -> end)

./jnk_cutter.sh -i input.mp4 -t 00:01:00 -t 00:02:00 -t 00:03:00 --no-skip

Split the files by defining multiple break points skipping every other section. (timing of the output files: 01:00 -> 02:00, 03:00 -> end)

./jnk_cutter.sh -i input.mp4 -t 00:01:00 -t 00:02:00 -t 00:03:00

Split the files by defining multiple break points skipping only the sections 1 & 4. (timing of the output files: 01:00 -> 02:00, 02:00 -> 03:00)

./jnk_cutter.sh -i input.mp4 -t 00:01:00 -t 00:02:00 -t 00:03:00 --skip=1,4

Time Formats

Here’s a few example of valid time formats:

12 (will be interpreted as 00h 00m 12s)
12.3 (will be interpreted as 00h 00m 12s 300ms)
1:23 (will be interpreted as 00h 01m 23s)
1:2:3 (will be interpreted as 01h 02m 03s)

See ffmpeg documentation for details on the time definition formats. jnk_cutter currently does not support the ffmpeg time duration formats which include s|ms|us suffixes and/or negative durations -.

License

CLI parser generated using Argbash v2.9.0 (BSD-3-Clause)

See git commits history for the complete list of collaborators.