GPU video synchronisation

SteSom — Wed, 27 Nov 2024 13:40:38 GMT

Hello,

I must synchronize the video and audio output to a PTP source (grandmaster clock). Therefore, I need a drift-free, synchronized audio/video clock, either the PTP or the system clock.

My hardware environment:

- Intel Atom x6211E using the integrated GPU and the HDMI output

- Linux: latest Debian Bookworm

From my understanding, the goal of linuxptp4l and phc2sys is to synchronize the system clock to an external source, which in my case is a PTP grandmaster clock. I measured the vertical syncs to see if they were in sync with the system clock, but they weren't. Is there a technology that syncs the pixel clock to the system clock? (TSN could be a keyword here) Or is there a way to tune/adjust the pixel clock somehow? I could also patch the driver to support such a functionality if the hardware supports it.

topic GPU video synchronisation in Software Tuning, Performance Optimization & Platform Monitoring

GPU video synchronisation