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

softworkz (2):
  avfilter/avfilter: add avfilter_print_config_formats()
  ftools/opt_common: Print filter input/output formats in help output

 doc/APIchanges              |   3 ++
 fftools/opt_common.c        |  37 +++++++++----
 libavfilter/avfilter.c      | 102 +++++++++++++++++++++++++++++++++++-
 libavfilter/avfilter.h      |  12 +++++
 libavfilter/avfiltergraph.c |  15 ++++--
 libavfilter/internal.h      |   9 ++++
 libavfilter/version.h       |   4 +-
 7 files changed, 163 insertions(+), 19 deletions(-)

base-commit: 479747645f795b6f4f376578ea1556409f943c31

Submitted-As: https://master.gitmailbox.com/ffmpegdev/pull.43.v2.ffstaging.FFmpeg.1665524301.ffmpegagent@gmail.com
In-Reply-To: https://master.gitmailbox.com/ffmpegdev/pull.43.ffstaging.FFmpeg.1665494271.ffmpegagent@gmail.com