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• Can not build ffmpeg with gpu acceleration on macOS

  21 février 2018, par Kirill Serebriakov

  I’m trying to use my GPU for video encoding/decoding operations on macOS.

  • OS : MacOS 10.12.5 (Sierra) //hackintosh if it matters
  • CUDA Toolkit 8.0 installed
  • NVidia GTX 1080 with latest web driver

  Followed this guides :

  • https://trac.ffmpeg.org/wiki/CompilationGuide/MacOSX
  • https://developer.nvidia.com/ffmpeg

  Config :

  ./configure --enable-cuda --enable-cuvid --enable-nvenc \
  
  --enable-nonfree --enable-libnpp \
  
  --extra-cflags=-I/Developer/NVIDIA/CUDA-8.0/include \
  
  --extra-ldflags=-L/Developer/NVIDIA/CUDA-8.0/lib

  Got this error :

  ERROR: cuvid requested, but not all dependencies are satisfied: cuda

  config.log - full configure log

  I did not install Video Codec SDK (not sure how to make it on macOS, just thought that it may come with cuda toolkit) and according to this page I have a lot of limitations on OSX.

  Is it possible on macOS ? Or this will work only for linux/windows ?

• dxva2_hevc : properly signal the num_delta_pocs from the SPS RPS

  2 mars 2015, par Hendrik Leppkes

  dxva2_hevc : properly signal the num_delta_pocs from the SPS RPS
  ucNumDeltaPocsOfRefRpsIdx needs to contain the flat value from the SPS RPS,
  
  and not the final computed value from the slice header RPS, as this calculation
  
  is done internally by the driver again.
  Sample-Id : http://trailers.divx.com/hevc/Sintel_4k_27qp_24fps_1aud_9subs.mkvi
  

  • [DH] libavcodec/dxva2_hevc.c
  • [DH] libavcodec/hevc.h
  • [DH] libavcodec/hevc_ps.c

• Gstreamer : Hauppauge HD PVR and Multi-video file output

  7 juin 2014, par user3716978

  I have very specific requirements for a Gstreamer pipeline that I can’t seem to create. I’m running Linux Mint Mate 14 (Nadia).

  I have an HD PVR, which records in MPEG TS. It presents, as its interface, a V4L2 device at /dev/video0. What I need is to somehow have it output the captured video to multiple files. That is, like dvgrab’s autosplit, it would output, say, 1800 frames, then create a new output file, then capture another 1800, and on and on.

  I’ve tried numerous methods. First, using multifilesink with the keyframe next-file option does what I want, but it doesn’t seem to add stream headers to the segment files, so that they cannot play properly and/or are missing their initial keyframe.

  I’ve tried limiting each individual capture length using num-buffers, and just restarting the capture after the previous one ends. This works for maybe 30 or 40 files but all the switching on and off eventually locks up the HD PVR, and it has to be power-cycled.

  I could also have it dump images to the disk and work with the individual frames, but this is very slow with MPEG TS since it has to demux, decode, and reencode every frame. It eats up 100% cpu and drops about 60% of the frames on my computer.

  ffmpeg doesn’t work, because the HD PVR driver doesn’t support ioctl. I can’t seem to get mencoder to stream it this way either, but maybe it’s possible ?

  What I need is to :

  • Have a single capture stream, to avoid pissing off the HD PVR
  • Have it split the stream into multiple files which can be individually analyzed
  • Have those multiple files be valid videos
  • Not eat up 100% of my CPU (although high utilization is ok, it needs to run at full speed). Since the stream is 1920x1080x60fps, anything to do with reencoding won’t work. It pretty much needs to be a stream copy.

  Thank you