When using lossy compression, DTS-HD MA is much more efficient than Dolby TrueHD, and essentially two-thirds as efficient as DTS MA. Though its advantages are in bitrate reduction there are a few drawbacks to using DTS-HD MA: DTS-HD MA bitstream is proprietary. DTS-HD MA is typically inserted at a lower bitrate than the current Dolby TrueHD. This lower bitrate can create image blocking artifacts, which means the image will be incompatible with electronics that employ such methods of image delivery or playback. DOLby TrueHD is an open format. The Open DOLby TrueHD standard is the most significant benefit to using DOLby TrueHD. Since the standard is open, the playback requirements and specifications are readily available for manufacturers. Furthermore, the standard is freely licensable. No expensive fees or royalties are associated with the content protection.
The Dolby LDAS combined format is the same concept, but offers stronger bitrate reduction than DTS-HD MA Content can be encoded in Dolby LDAS format and played back in a Dolby LDAS decoder. However, Dolby LDAS is limited to lossy compression.
Where possible, DTS-HD MA should be used to mitigate any limitations in support from hardware and/or firmware. If a disc or receiver does not play either format, the playback will play the DTS or Dolby TrueHD soundtrack instead.
The two standards are also identical in the types of hardware they require to run. As a digital format, DTS-HD Master Audio requires HDMI version 1.3 or higher for its transmission. The processing of the standard can be done by either a Blu-ray player or A/V receiver. DTS-HD Master Audio, like Dolby True HD, is also backward compatible. If your Blu-ray player or receiver does not support the standard, the soundtrack will still be played back. DTS-HD MA does not include a bitstream, so the process is much simpler than that of DTS-HD Master Audio tracks. A decoder simply restores the materials it receives. While it can run with a player or by itself, the standard also can work at lower resolutions like SACD, or at bitrates up to 11 kHz. Dolby True HD offers only lower bitrates, while DTS-HD Master Audio has no upper limit. The audio bitrate of a DTS-HD MA track is defined in the original source, usually either AAC or lossless PCM. d2c66b5586