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README.md

Personal FFMPEG fork

This fork contains the following extensions to ffmpeg (each in its own branch):

  1. nlmeans - Non-Local Means noise reduction filter.
  2. fieldshift - Horizontally shift fields of interlaced images against each other (useful e.g. for VHS video recovery).
  3. libde265 - Integration of libde265 HEVC video decoder.

Documentation

nlmeans

Parameters:

  • h - averaging weight decay parameter (larger values give smoother videos)
  • range - spatial search range (default=3), should be odd number.
  • temporal - number of frames to include into search (default=2)
  • patchsize - pixel context region width (default=7, little need to change), should be odd number.

The defaults (h=8, range=3, temporal=2) is a good starting point for the restoration of very noisy video (old VHS tapes). You may also try 10/5/3 for really noisy inputs or 6/3/1 for good quality inputs.

The NLMeans filter is under GPL, so be sure to configure with --enable-gpl.

fieldshift

  • offset - pixel offset between successive rows

libde265

Get and install the latest version of libde265 from here: https://github.com/strukturag/libde265

Configure this ffmpeg fork with at least these options:

./configure --enable-libde265 --enable-decoder=libde265 --enable-gpl

The patched ffmpeg can play MKVs containing H.265 streams encoded with the DIVX HEVC encoder. You can download an example stream from their webpage: http://labs.divx.com/node/127909

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