With same bit rate, especially in low bit rate, AAC has a better sound quality than AC3. In this way, it can produce an audio file with a smaller size while preserving sound quality.
#IS DDP AUDIO SAME AS AC3 MANUAL#
ffmpeg decodes the AC3 audio stream to PCM float planar and accoring to the ilcomponent manual for the audio mixer is only accepts linear input. I did not find the right setting yet to use the hw audio mixer to do this downsampling. The DDP Creator lets you assemble professional RedBook compatible audio CD’s and supports the import and export of DDP 2.00 images and Cue Sheet (cue) files. I use ffmpeg for decoding and downsampling to stereo. Tips: With VBR, the audio can be stored in an economic way by allocating a higher bit rate to the more vibrant parts of media files and a lower bit rate to the more constant segments. The Sonoris DDP Creator is a standalone cross-platform DDP authoring application compatible with virtually any DAW software on the market. The audio compression for this format is lossy and Dolby Digital is the most commonly used version of this format which can house up to six sound channels together. Import those 6 wave files in Vegas to 'mux' them back to AC3. Adjust the 6 tracks (by cutting/adding silence) coming from the AC3 file to sync it with the AAC file.
Import both files inside Audacity using the FFMPEG plugin. It basically allows a TV to pass through any audio it receives, to the AVR/Soundbar without any re-encoding. Tips: A higher bit rate normally guarantees a better quality. AC3 (Audio Coding) is nothing but Dolby Digital Audio Codec, which we commonly use these days on most of the audio devices. Extract both the AAC and AC3 audio files from their respective MKV files using MKVEXTRACT. This 'enhanced Audio Return Channel' can support the full audio bandwidth of the HDMI forward direction (IEC frame rate of 768 kHz), and can carry Dolby TrueHD/MAT as well as DTS-HD Master Audio.
Tips: The higher the sample rate the greater the dynamic range, which means more detail will be captured and the quality of the audio will be better.
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