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mardi 18 août 2015

DAW HDMI Audio with PC Audio/Video

Some may not realize that most decent modern Windows PCs (those with HDMI outputs) can support high quality DAW audio simultaneously with Windows audio/video without an external DAW interface. With Pro Tools, all that’s necessary is a modern home theater system and/or a high definition audio/video display with HDMI input(s) and ASIO4ALL. (See Benoni’s excellent video on ASIO4ALL installation/use at https://www.youtube.com/watch?v=uCim46I4iRc.)

For HDMI sound from Pro Tools, Windows is first used to configure the speakers as well as their sample rates and bit depths (after connecting a HDMI cable to the computer and theater system). Then, when Pro Tools starts with no other external interfaces connected, a new session using that sample rate with ASIO4ALL as the “Playback Engine” can be created. The ASIO4ALL control panel is then used to select the available HDMI audio device for Pro Tools. The default Windows Playback Device should be set to the computer’s speakers/headphones – as shown below.


For this demonstration, Windows Media Player was used to playback a 1080i / 5.1 video on a laptop’s display extended onto a home theater system display to the right of the main display. The main display was used for Pro Tools and the laptop speakers were used by Media Player. To see how well that Dell i5 @ 1.7GHz with 12GB memory and 5400 RPM hard drive laptop could do, I used a 96 kHz sample rate and listened for audio dropouts as was documented previously at http://ift.tt/1Jg9fiN. Even though the desktop computer used previously was much faster and wasn’t playing video, the dropout test results at 64, 128, and 256 sample buffer sizes were approximately the same. The three attached pdf documents show both displays and the system configurations for all three buffer sizes.

As shown below, Window’s resource monitor, DPC Latency Checker, and PT’s “System Usage” provide additional information on computer (Windows 8.1) and Pro Tools (12.1) performances. Note that the 1000 microsecond offset shown by DPC Latency Checker is due to an incompatibility with Windows 8, as described at the website - http://ift.tt/LnCpjv.


I hope this is understandable/usable – maybe Benoni would be willing to do another one of his excellent videos!

Can Mac’s do this too? :-)

Attached Thumbnails
Click image for larger version Name: 64 Samples.jpg Views: N/A Size: 54.3 KB ID: 4828   Click image for larger version Name: 64 Samples CPU.jpg Views: N/A Size: 73.5 KB ID: 4829  
Attached Files
File Type: pdf 64 Samples.pdf (246.1 KB)
File Type: pdf 128 Samples.pdf (252.1 KB)
File Type: pdf 256 Samples.pdf (245.7 KB)


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