@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 <
greg.armstrong...@renesas.com> 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 <ankur.at.n...@gmail.com>
> *Sent:* May 5, 2021 4:18 PM
> *To:* linuxptp-users@lists.sourceforge.net
> *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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