What are all of the file extensions supported by FFmpeg

Question

How would I go about getting a list of all the file extensions supported by FFmpeg for use in an ExtensionFilter used by FileChooser in JavaFX?

I am familiar with the "-codecs" and "-formats" options from FFmpeg, but these list the format and codec names which do not necessarily coincide with their file extensions.

e.g. (partial output from "ffmpeg -formats")

• D aac raw ADTS AAC (Advanced Audio Coding)
• DE ac3 raw AC-3
• E matroska Matroska

parsing aac and ac3 from the output of ffmpeg would work fine to create file extensions for those types of files, but matroska has ".mkv" file extension.

Answer 1

There's no list directly available. You'll have to run

for input formats, ffmpeg -demuxers
for output formats, ffmpeg -muxers

Then for each entry, run

for input formats, ffmpeg -h demuxer=entry
for output formats, ffmpeg -h muxer=entry

Each format readout will show something like,

Muxer matroska [Matroska]:
    Common extensions: mkv.
    Mime type: video/x-matroska.
    Default video codec: h264.
...

or

Demuxer avi [AVI (Audio Video Interleaved)]:
    Common extensions: avi.
...

Then you can collect all extensions from the Common extensions entries.