On Sunday, October 9, 2016 11:48:27 PM CDT Marcelo Boufleur wrote: > > SDI is 20bit 48k audio only. There’s really no good reason for anything > > else. > > Technically SDI also supports 48048 and 47952 to allow for pull up/down, > > but I > > think that is done by manipulating the clock rather than explicitly > > changing > > the sample rate. > > SD-SDI PCM Audio is 20 bits, but it can also support 24 bits according to > SMPTE 272M. > Sampling rate can also range from 32Khz to 48Khz. > > For HD, there's also SMPTE 299M which mandates 24 bit audio, and also > sampling rates range from 32Khz to 48Khz.
Although that is in the official spec, I have never seen any SDI equipment use anything other than 48k. Doesn’t mean any doesn’t exist, but if so it’s not very common. I’m not sure there is a difference between 20 and 24 bit audio (in reguards to the bit allocation within the signal) since 20 bit is usually padded inside of a 24 or 32 bit word size. > > You can also have 20 bit in HD (and also SD) in the form of non-audio PCM > Data, using SMPTE 337M format (for Dolby-E and other compressed formats > described in SMPTE 338M). _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
