Looking for advice - ffmpeg-free and wf-recorder

[Bob Hepple <bob.hepple@xxxxxxxxx>]

I am the packager for wf-recorder (a wl-roots/wayland screen recorder) which presently resides in rpmfusion - it uses proprietary ffmpeg codecs by default (libx246).

Now that we have ffmpeg-free we have an opportunity to move wf-recorder to the mainstream and change the default codec to the non-proprietary libopenh264. This woud be in rawhide/f38 and on.

This all works fine in testing on f37. The fly in the ointment is that if ffmpeg/rpmfusion is installed in place of ffmpeg-free, then wf-recorder can no longer access libopenh264 and fails with an error. There is a workaround in the use of the option -c libx264. 

Several solutions occur to me and I'm looking for guidance on which path to take:

0. leave wf-recorder where it is, in rpmfusion as in f37 and earlier.

A. compile wf-recorder as shipped by upstream with the default libx264 - the '-c libopenh264' workaround would be needed if ffmpeg-free is installed. This annoys users who install stock fedora.

B. compile wf-recorder with libopenh264 as the default - the '-c libx264' workaround would be needed if ffmpeg/rpmfusion is installed and would annoy those users.

C. leave wf-recorder in rpmfusion and create a wf-recorder-free package by analogy to ffmpeg (this might be obscure as it's not likely to get much publicity - and annoy everyone sooner or later)

D. the best option might be to choose a codec common to both ffmpeg and ffmpeg-free. I'm not terribly au fait with the various codecs so which would I choose? These codecs appear to be in both packages:

 h263_v4l2m2m         V4L2 mem2mem H.263 encoder wrapper (codec h263)
 h264_amf             AMD AMF H.264 Encoder (codec h264)
 h264_nvenc           NVIDIA NVENC H.264 encoder (codec h264)
 h264_qsv             H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (Intel Quick Sync Video acceleration) (codec h264)
 h264_v4l2m2m         V4L2 mem2mem H.264 encoder wrapper (codec h264)
 h264_vaapi           H.264/AVC (VAAPI) (codec h264)
 hevc_amf             AMD AMF HEVC encoder (codec hevc)
 hevc_nvenc           NVIDIA NVENC hevc encoder (codec hevc)
 hevc_qsv             HEVC (Intel Quick Sync Video acceleration) (codec hevc)
 hevc_v4l2m2m         V4L2 mem2mem HEVC encoder wrapper (codec hevc)
 hevc_vaapi           H.265/HEVC (VAAPI) (codec hevc)
 libaom-av1           libaom AV1 (codec av1)

libopenjpeg          OpenJPEG JPEG 2000 (codec jpeg2000)
 librav1e             librav1e AV1 (codec av1)
 libsvtav1            SVT-AV1(Scalable Video Technology for AV1) encoder (codec av1)
 libtheora            libtheora Theora (codec theora)
 libvpx               libvpx VP8 (codec vp8)
 libvpx-vp9           libvpx VP9 (codec vp9)
 libwebp_anim         libwebp WebP image (codec webp)
 libwebp              libwebp WebP image (codec webp)
 mjpeg_qsv            MJPEG (Intel Quick Sync Video acceleration) (codec mjpeg)
 mjpeg_vaapi          MJPEG (VAAPI) (codec mjpeg)
 mpeg2_qsv            MPEG-2 video (Intel Quick Sync Video acceleration) (codec mpeg2video)
 mpeg2_vaapi          MPEG-2 (VAAPI) (codec mpeg2video)
 mpeg4_v4l2m2m        V4L2 mem2mem MPEG4 encoder wrapper (codec mpeg4)
 vp8_v4l2m2m          V4L2 mem2mem VP8 encoder wrapper (codec vp8)
 vp8_vaapi            VP8 (VAAPI) (codec vp8)
 vp9_qsv              VP9 video (Intel Quick Sync Video acceleration) (codec vp9)
 vp9_vaapi            VP9 (VAAPI) (codec vp9)

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