/tech/ - Technology★

ffmpeg

convert video file to webm:

.\ffmpeg.exe -i D:\chan\webm\abc.mp4 -c:v libvpx-vp9 -c:a opus -vf scale=720:-1 -strict -2 -b:v 300k -b:a 128k -cpu-used 3 D:\chan\webm\abc.webm

slice section out of webm:

ffmpeg -i input.webm -ss 0:13.123 -to 1:15.005 -c copy out.webm

>>960671

>not calculating the correct bitrate to hit 14.5 mb based on static audio bitrate and time length of file.

it's like you don't want 8ch to be filled with high quality webms.

>>960671

If the file is an mp4, cutting from in and out points without re-encoding is the best option. This isn't halfchan.

>>960691

>14.5mb

>not 16 mebibytes

>>960714

8chan should at least allow us to upload .ogg files and .mkv instead of .mp4.

I get matroska is retarded for not having fractional timings but otherwise at least it's not mp4.

>>960937

99% sure the file types allowed are because of web browsers supporting the file types to begin with i.e I can open .mp4's, .webm's, etc in a web browser, but get a "download" prompt instead trying the same thing with .mkv or .avi.

>>960637 (OP)

>>>/webm/

>>960714

By the time you're done encoding.

ffmpeg but don't tell anyone

>>960937

>>14.5mb

>>not 16 mebibytes

It's best to aim slightly under the limit as depending what you're doing you can find when you aim for 16Mb the file ends up at 16.7Mb and is too large.

Also, if the video is the maximum size you can't upload additional media in the same post, since the upload limit is per post.

>>960637 (OP)

I use ffmpeg with a user interface (Axiom) because I only have 1 fucking life and I don't want to waste it learning ffmpegs autistic command interface