stereo and multichannel versions), make sure they are in separate files. get your audio into a continuous raw Dolby Digital stream in a file. make sure you have the ffmpeg command line utility installed.Unfortunately the M4V format does not support DTS as a codec, they remain only playable in WAV-type PCM files. The M4V format also supports chapters, a new menu being added when iTunes detects a track has chapters defined in it - this makes it possible to import a whole album as a continuous DD stream and to access individual tracks as chapters, meaning the audio can play continuously without gaps, gaps being unavoidable if the album is imported as separate tracks. It also contains only raw DD, unlike WAV files which encapsulate it in a padded-out S/PDIF format and use much more space, so it helps to make the most of hard disk space. This provides what is needed - no other application producing audio can mix anything into the playback stream so it stays intact.Īn M4V file imported into iTunes can be played like an MP3, WAV, or ALAC file, but now with full multichannel support. Playing a Dolby Digital track causes iTunes to set up the audio device for exclusive use, the stream being selected via the "Audio & Subtitles" submenu on the Controls menu which becomes available when multiple streams are present in an imported M4V file. This supports multiple audio codecs including Dolby Digital, including multichannel Dolby Digital. However there IS a way by using the M4V format used by podcasts. This works but iTunes does not have exclusive use of the device, so system beeps or viewing web page videos will disrupt the decoding of the bitstream and leave just silence, or even worse, a very loud noise. The only way seems to be to have Dolby Digital or DTS in WAV files and to manually set up the digital output audio device to the right sample rate, setting the iTunes volume to maximum (x1) to preserve the bitstream. It would be great to have multichannel music in iTunes but "multichannel" and "iTunes" are two words which don't mix. This is for Macs but may work on Windows as well with a little "standing on one leg and pulling faces" and such like. This is intended to be a tutorial, hopefully not duplicating a pre-existing thread.
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