[mythtv-commits] [MythTV/mythtv] 228e57: Fix ac3 encode to work with FFmpeg 4.4.1

[Peter Bennett]

  Branch: refs/heads/devel/ffmpeg-resync
  Home:   https://github.com/MythTV/mythtv
  Commit: 228e576bb964ff4094b09e5f2f0d69a6d08ee9fa
      https://github.com/MythTV/mythtv/commit/228e576bb964ff4094b09e5f2f0d69a6d08ee9fa
  Author: Peter Bennett <pbennett at mythtv.org>
  Date:   2021-11-09 (Tue, 09 Nov 2021)

  Changed paths:
    M mythtv/libs/libmyth/audio/audiooutputdigitalencoder.cpp

  Log Message:
  -----------
  Fix ac3 encode to work with FFmpeg 4.4.1

MythTV encodes ac3 audio when using the "Upconvert stereo to 5.1 Surround"
option and when using time stretch on content already encoded with ac3
5.1 sound.

FFmpeg 4.4.1 "ac3_fixed" encoder now only supports 32bit samples. We were
using 16bit samples, so a change was needed.

With this commit, ac3 encoding now uses "ac3" encoder instead of "ac3_fixed".
This is a superior encoder that uses floating point instead of integer
arithmetic. The code can still support "ac3_fixed" by setting
If needed this can be made a configure option.