See Music Video Single Crop Dimensions Metadata Example in the iTunes Package Music Specification for details. If the SD source is matted, the SD source should be delivered in its full-frame state with metadata included to specify the crop rectangle. Video source may be delivered matted: letterbox, pillarbox, or windowbox. Gamma values are accepted and the value must be between 2.15 and 2.25 Interlaced content must be tagged non-progressive and field ordering must be defined in the streamįield dominance must be properly tagged (top field first, bottom field first, or progressive) There must be no additional silence at the end of each track when compared to the same track from the corresponding stereo deliverable.Ģ Height depends on aspect ratio of source with a maximum of 480 pixelsĪll encoded content must include pixel aspect ratio (pasp), preferably one that results in a display aspect ratio of 4:3 or 16:9.Ģ9.97 interlaced frames per second video source, delivered as either interlaced or de-interlaced properly tagged as progressiveĢ4, 25, or 30 frames per second sourced from film, delivered as progressiveĢ3.976 frames per second for inverse telecine, delivered as progressive must not be delivered interlaced or delivery will failįor mixed frame rate material, contact your iTunes Technical Representative
1770-4.įor albums where gapless playback is intended between tracks:Įach album track must be delivered as an individual BWF ADM file.Įach track boundary must be no more than half a frame (1,000 samples 48 kHz) earlier or later than the same track boundary in the corresponding stereo deliverable. True-peak level should not exceed -1 dB TP measured as per ITU-R BS. The integrated loudness value should not exceed -18 LKFS measured as per ITU-R BS. You must conform and sync the Atmos files with the stereo reference files for the same project.
#ANNOTATION TRANSCRIBER EXPORT NO TIMECODE CODE#
Provide the Dolby Atmos file as a Broadcast Wave Format Audio Definition Model (BWF ADM) file.Īll tracks within a project must be at the same frame rate.Īll audio must be 24-bit linear pulse code modulation (LPCM) audio at 48kHz. Note: Dolby Atmos audio files generated from stereo mixes are not allowed. (ALAC or FLAC lossless compression is acceptable.) Native resolution of project should be used - do not down-sample. The format of the files must be 24-bit PCM at a sample rate of 44.1, 48, 88.2, 96, 176.4, or 192 kHz. Use these tools to set an appropriate level so that the encode doesn't show clipping.Īlthough Apple doesn't reject files for specific numbers of clips, audible clipping caused by excessive levels to the encoder may be reason for tracks to not be badged and marketed as an “Apple Digital Master." (Up-sampling and/or bit-padding of 44.1 kHz/16-bit files is not allowed.)Īll files must have been auditioned as encoded by the current Apple AAC encoder either with the “Apple Digital Masters Droplet", "RoundTripAAC" plug-in, or the Sonnox "Pro-Codec V2" plug-in that includes Apple's "iTunes +" AAC CODEC. Source format must have been minimum 24-bit with a minimum sample rate of 44.1 kHz. Apple recommends communicating these best practices to your mastering house: The following lists best practices for producing Apple Digital Masters content. Table 1: ProRes Audio Channel Data Assignment and Levelsīest Practices for Apple Digital Masters Content.Film Audio/Video and Alt-Audio Container.
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