On 12/16/22 21:29, Bob Hepple wrote:
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.
Thanks for considering that!f37 would be nice too. ffmpeg-free is available in this release, so nothing prevents moving wf-recorder to Fedora 37 repos.
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)
Option C sounds like too much maintenance burden for a default option value.
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)
I'm not an expert enough to tell what to choose, but at least I can tell what should be avoided:
- anything h264 or HEVC - these are patented and Fedora won't ship a software implementation of the encoder for these. (except libopenh264, but OSTree-based systems won't have even that). - anything with words vaapi, qsv, v4l2m2m or amf - these only work with a specific hardware
- image formats - jpeg or webp might be a bad choice for a screen recorderNext I'm going to suggest to exclude Theora (a bit outdated) and AV1 (which is _slow_ and less widespread, especially in hw decoders).
Huh, that leaves us with VP8 and VP9. I don't know how these compare in real-time encoding speed but I hope that VP9 encoder is fast enough for hardware released after 2013 :)
Please, also consult with the upstream - wf-recorder includes default parameters for libx264/libx265[1], so they could add a good preset for a royalty-free encoder.
[1]: https://github.com/ammen99/wf-recorder/blob/master/src/frame-writer.cpp#L47
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