Am 20.12.2015 um 15:11 schrieb Nicolas George: > Le decadi 30 frimaire, an CCXXIV, Matthias Hunstock a écrit : >> Decklink cards actually do just some bitbanging: take digital input in >> "raw" format (AFAIK UYVY422 10 bit, PCM 16bit) and copy that into your RAM. > > Take digital input... from where?
Ok, the bigger picture: The BlackMagic DeckLink series are capture (and sometimes playout) cards, mostly having SDI in-/outputs, sometimes also HDMI; some older models have analog inputs (RGB component, YUV component and so on) and do ADC themselves. So the digital input is in most cases (HD-)SDI or HDMI, which also includes audio. Since there are well-known "pix_fmts" on the wire, there is only little conversion available in the cards. AFAIK only 10bit/8bit conversion on the video data. So using these cards means you get blasted with raw UYVY422 data and either 2, 8 or 16 PCM 16bit audio channels. Reverse logic applies for playout. >> Another possibility is to demux each channel as a mono track. Would this >> make more sense? > > It depends on the use case, and therefore on where the channels come from. Yes. IMHO a channel mapping is needed in 95% of the use cases, so if it is valid to have an unspecified channel layout than it should be used. Regards _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
