ffmpeg-webm-scripts

Currently two scripts, reverse and backforth script. Reverse just reverses the whole thing and backforth goes forth first and then back again. Loop with 4chan x or this webm looper userscript.

Normally you would use ffmpeg to create a 4khan webm like this:

ffmpeg -i chinese-cartoon.mkv -ss 00:01:54.239 -to 00:01:56.992 -c:v libvpx -crf 4 -b:v 4500K -vf scale=-1:-1 -an output.webm

For my scripts the following parameters are available i:s:t:o:f:c:a:, of these i:s:t: are required. In the same order they are input file, start time, stop time, output file (default: output.webm), framerate (default 4500K), crop and scale. Order of crop and scale is important! Decide if you want to crop or scale first, input parameters in that order.

Examples:

Example 1: No fancy stuff like cropping or scaling. test1.webm is generated with the following command:

ffmpeg-webm-backforth -i \[Watakushi\]\ Akuma\ no\ Riddle\ -\ 04\ \[720p\]\[5A124B29\].mkv -s 00:01:00.000 -t 00:01:02.000 -o test1.webm

Example 2: Cropping first, then scaling. test2.webm is generated with the following command:

ffmpeg-webm-backforth -i \[Watakushi\]\ Akuma\ no\ Riddle\ -\ 04\ \[720p\]\[5A124B29\].mkv -s 00:01:00.000 -t 00:01:02.000 -o test2.webm -c 474,0,726,720 -a -1:400

This command now takes new values for cropping, instead of the normal what ffmpeg needs, the script will calculate the correct values, you just need to insert your x1,y1 and x2,y2. See the cropping_example.png for which points you need to add, all with comma's.