MKV stretch by flag for audio playback

[mhendu]

Hi there,

I've tried LAV filters in a few players, including MPC-HC, and when I play back a file where the audio has been stretched to conform to a different video length (e.g., in converting a 25fps video to 24fps and stretching the audio by 25/24) the player seems to want to continue to play back the file at the original frame rate, resulting in dropped or repeated frames. Would be great to have support for the MKV stretch by flag to avoid this behavior and to play back the audio at the desired rate.