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Allow the user to specify the order in which muxer applications are tried, instead of using a
hard-coded ordering per container type. The ordering is specified per container type ("mkv",
"mp4", "avi", "ts", etc.). The user specifies an ordering such as "ffmpeg,vlc,mp4box" which means
that ffmpeg is tried first, and if that fails vlc, and if that fails mp4box. The muxers currently
available are ffmpeg, vlc, mkvmerge and mp4box. See commandline arguemnt--muxer-preference. -
Work around a bug in VLC, which does not correctly report failure to mux via a non-zero exit code.