ffmpeg

Docs

Supported formats:

ffmpeg -formats

Supported decoders/encoders:

ffmpeg -codecs
ffmpeg -encoders
ffmpeg -decoders

Details for particular encoder/decoder:

ffmpeg -h decoder=h264
ffmpeg -h encoder=libx264

Supported muxer/demuxer:

ffmpeg -muxers
ffmpeg -demuxers

Details for particular muxer/demuxer:

ffmpeg -h muxer=webm
ffmpeg -h demuxer=flv

Available filters:

ffmpeg -filters

Details for particular filter:

ffmpeg -h filter=aecho
ffmpeg -h filter=blackdetect

Pixel formats:

ffmpeg -pix_fmts

Supported bitstream filters:

ffmpeg -bsfs

Layouts for audio (mono/stereo/etc):

ffmpeg -layouts

Available protocols:

ffmpeg -protocols

mediainfo $FILE
ffprobe $FILE

-maxrate should be accompanied with -bufsize option like:

-maxrate 800k -bufsize 1200k

otherwise you'll get warning:

> VBV maxrate specified, but no bufsize, ignored

-b:v RATE allows to specify average bitrate for video.

To specify video stream use syntax like:

-c:v:0 libx264 -b:v:0 2000k -maxrate:v:0 2200k -bufsize:v:0 3000k

https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate: Limiting the output bitrate.
https://trac.ffmpeg.org/wiki/EncodingForStreamingSites: Encoding for streaming sites.

ffmpeg -i in.mp4 -i logo.png out.mp4
ffmpeg -i in.mp4 -i logo.png -filter_complex "overlay=x=10:y=20" out.mp4