Package ffmpeg

Failed to find a solution:

no platform:
2025-05-16 17:24.36 [INFO] Solving for ocaml-base-compiler,
                           ffmpeg, constraints ocaml-base-compiler<=5.3.0,
                           ffmpeg=1.2.3 using opam_repository_commit cf409d95af00ff822422bd76b657ed213b661401

2025-05-16 17:24.38 [INFO] base: eliminated all possibilities in 0.65 s

2025-05-16 17:24.38 [INFO] = base =

2025-05-16 17:24.38 [INFO] Can't find all required versions.
Selected: base-threads.base base-unix.base dune.3.18.2 ocaml.5.5.0
          ocaml-config.3 ocaml-options-vanilla.1 ffmpeg&ocaml-base-compiler
          ocaml-variants ocaml-base-compiler ocaml-base-compiler
- ffmpeg -> ffmpeg.1.2.3
    User requested = 1.2.3
- ffmpeg-av -> (problem)
    ffmpeg 1.2.3 requires = 1.2.3
    Rejected candidates:
      ffmpeg-av.1.2.4: Incompatible with restriction: = 1.2.3
      ffmpeg-av.1.2.2: Incompatible with restriction: = 1.2.3
      ffmpeg-av.1.2.1: Incompatible with restriction: = 1.2.3
      ffmpeg-av.1.2.0: Incompatible with restriction: = 1.2.3
      ffmpeg-av.1.1.11: Incompatible with restriction: = 1.2.3
      ...
- ffmpeg-avcodec -> (problem)
    ffmpeg 1.2.3 requires = 1.2.3
    Rejected candidates:
      ffmpeg-avcodec.1.2.4: Incompatible with restriction: = 1.2.3
      ffmpeg-avcodec.1.2.2: Incompatible with restriction: = 1.2.3
      ffmpeg-avcodec.1.2.1: Incompatible with restriction: = 1.2.3
      ffmpeg-avcodec.1.2.0: Incompatible with restriction: = 1.2.3
      ffmpeg-avcodec.1.1.11: Incompatible with restriction: = 1.2.3
      ...
- ffmpeg-avdevice -> (problem)
    ffmpeg 1.2.3 requires = 1.2.3
    Rejected candidates:
      ffmpeg-avdevice.1.2.4: Incompatible with restriction: = 1.2.3
      ffmpeg-avdevice.1.2.2: Incompatible with restriction: = 1.2.3
      ffmpeg-avdevice.1.2.1: Incompatible with restriction: = 1.2.3
      ffmpeg-avdevice.1.2.0: Incompatible with restriction: = 1.2.3
      ffmpeg-avdevice.1.1.11: Incompatible with restriction: = 1.2.3
      ...
- ffmpeg-avfilter -> (problem)
    ffmpeg 1.2.3 requires = 1.2.3
    Rejected candidates:
      ffmpeg-avfilter.1.2.4: Incompatible with restriction: = 1.2.3
      ffmpeg-avfilter.1.2.2: Incompatible with restriction: = 1.2.3
      ffmpeg-avfilter.1.2.1: Incompatible with restriction: = 1.2.3
      ffmpeg-avfilter.1.2.0: Incompatible with restriction: = 1.2.3
      ffmpeg-avfilter.1.1.11: Incompatible with restriction: = 1.2.3
      ...
- ffmpeg-avutil -> (problem)
    ffmpeg 1.2.3 requires = 1.2.3
    Rejected candidates:
      ffmpeg-avutil.1.2.4: Incompatible with restriction: = 1.2.3
      ffmpeg-avutil.1.2.2: Incompatible with restriction: = 1.2.3
      ffmpeg-avutil.1.2.1: Incompatible with restriction: = 1.2.3
      ffmpeg-avutil.1.2.0: Incompatible with restriction: = 1.2.3
      ffmpeg-avutil.1.1.11: Incompatible with restriction: = 1.2.3
      ...
- ffmpeg-swresample -> (problem)
    ffmpeg 1.2.3 requires = 1.2.3
    Rejected candidates:
      ffmpeg-swresample.1.2.4: Incompatible with restriction: = 1.2.3
      ffmpeg-swresample.1.2.2: Incompatible with restriction: = 1.2.3
      ffmpeg-swresample.1.2.1: Incompatible with restriction: = 1.2.3
      ffmpeg-swresample.1.2.0: Incompatible with restriction: = 1.2.3
      ffmpeg-swresample.1.1.11: Incompatible with restriction: = 1.2.3
      ...
- ffmpeg-swscale -> (problem)
    ffmpeg 1.2.3 requires = 1.2.3
    Rejected candidates:
      ffmpeg-swscale.1.2.4: Incompatible with restriction: = 1.2.3
      ffmpeg-swscale.1.2.2: Incompatible with restriction: = 1.2.3
      ffmpeg-swscale.1.2.1: Incompatible with restriction: = 1.2.3
      ffmpeg-swscale.1.2.0: Incompatible with restriction: = 1.2.3
      ffmpeg-swscale.1.1.11: Incompatible with restriction: = 1.2.3
      ...
- ocaml-base-compiler -> ocaml-base-compiler.5.3.0
    User requested <= 5.3.0
- ocaml-compiler -> (problem)
    ocaml-base-compiler 5.3.0 requires = 5.3.0
    Rejected candidates:
      ocaml-compiler.5.5: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.4: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.3.0: Requires ocaml = 5.3.0
      ocaml-compiler.5.3.0~rc1: Incompatible with restriction: = 5.3.0
      ocaml-compiler.5.3.0~beta2: Incompatible with restriction: = 5.3.0
      ...
- ocaml-variants -> (problem)
    Rejected candidates:
      ocaml-variants.5.5.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.4.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.1+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.0+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ocaml-variants.5.3.0+BER: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler
      ...