Print filter input/output formats in help output

[softworkz]

Example output for command: ffmpeg -h filters=overlay

Filter overlay
  Overlay a video source on top of the input.
    slice threading supported
    Inputs:
       #0: main (video), Formats: Dynamic, Default: [yuv420p, yuvj420p, yuva420p, nv12, nv21]
       #1: overlay (video), Formats: Dynamic, Default: [yuva420p]
    Outputs:
       #0: default (video), Formats: Dynamic, Default: [yuv420p, yuvj420p, yuva420p, nv12, nv21]

overlay AVOptions:
    [...]

Examples for what it prints in various cases

For pass-through filter links

"All (passthrough)"

For filters using query_formats

"Dynamic"

For filters using query_formats where a call to query_formats succeeds

"Dynamic, Default: [yuv420p, yuvj420p, yuva420p, nv12, nv21]"

For all other cases

"[s16p, s32p, fltp, dblp]"

Except when all formats are supported
(number of formats equals number of available formats)

"All"

---

v2: rebase and fix compiler warnings

[ffmpeg-codebot]

There is an issue in commit 16588e7:
Please wrap lines in the body of the commit message between 60 and 72 characters.

[softworkz]

/submit

[ffmpeg-codebot]

Submitted as pull.43.ffstaging.FFmpeg.1665494271.ffmpegagent@gmail.com

To fetch this version into FETCH_HEAD:

git fetch https://github.com/ffstaging/FFmpeg pr-ffstaging-43/softworkz/submit_print_formats-v1

To fetch this version to local tag pr-ffstaging-43/softworkz/submit_print_formats-v1:

git fetch --no-tags https://github.com/ffstaging/FFmpeg tag pr-ffstaging-43/softworkz/submit_print_formats-v1

[softworkz]

/submit

[ffmpeg-codebot]

Submitted as pull.43.v2.ffstaging.FFmpeg.1665524301.ffmpegagent@gmail.com

To fetch this version into FETCH_HEAD:

git fetch https://github.com/ffstaging/FFmpeg pr-ffstaging-43/softworkz/submit_print_formats-v2

To fetch this version to local tag pr-ffstaging-43/softworkz/submit_print_formats-v2:

git fetch --no-tags https://github.com/ffstaging/FFmpeg tag pr-ffstaging-43/softworkz/submit_print_formats-v2