How to use ffmpeg to downmix 5.1 DTS HD MA or Dolby TrueHD to stereo AAC with Dolby Pro Logic II?
Solution 1:
According to the manual entry on aresample, you have to supply the resampler options in a different format:
The filter accepts the syntax
[sample_rate:]resampler_options, wheresample_rateexpresses a sample rate andresampler_optionsis a list ofkey=valuepairs, separated by ":".
That means you'd need to call it like this:
-af "aresample=matrix_encoding=dplii"