Hi Ankur, Sorry, I misread thinking you wanted to apply the frame rate at the slave. I now understand that you are asking how to set the frame rate as the grandmaster.
Greg From: Ankur Sharma <[email protected]> Sent: May 14, 2021 2:34 PM To: Greg Armstrong <[email protected]> Cc: [email protected] Subject: Re: [Linuxptp-users] SMPTE-2059 Frame Rate 50Hz @Dennis, You are right. I am referring to the use of a PTP management TLV to set various Synchronization Metadata (SM) fields for the video stream. There is a field in this metadata header which is "System Frame Rate". By default it is set to 29.97 Hz. However, I am not sure how to configure PTP4L to change it to 50Hz. @Greg, If I understand correctly, there is no configuration parameter for PTP4L to configure this value? I would like to avoid changing this value in the code for now. If there is a way to configure this parameter through ptp4l.conf or command line, that would be great. On Fri, May 14, 2021 at 7:34 AM Greg Armstrong <[email protected]<mailto:[email protected]>> wrote: Hi Ankur, I don’t think you would set this up via ptp4l but via the PHC to set a periodic output (PTP_PEROUT_REQUEST). Below would be an example for 50Hz. perout_request.start.sec = ts.tv_sec + 1; perout_request.start.nsec = 0; perout_request.period.sec = 0; perout_request.period.nsec = 20000000; if (ioctl(fd, PTP_PEROUT_REQUEST, &perout_request)) { pr_err("PTP_PEROUT_REQUEST"); return -1; } Greg From: Ankur Sharma <[email protected]<mailto:[email protected]>> Sent: May 5, 2021 4:18 PM To: [email protected]<mailto:[email protected]> Subject: [Linuxptp-users] SMPTE-2059 Frame Rate 50Hz Hi, Related to the SMPTE-2059 profile, Can anyone guide/suggest on how we can set the System Frame Rate of 50hz with PTP4L? Regards, Ankur -- ankurandy
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