TDA2SX: Sync Link frame drop issue

Socrates Paramasivam

Part Number: TDA2SX

Hi,

I am facing issues in sync link when i run the following usecase on TDA2x EVM.

Usecase:

NullSource (A15) -> Dup_alg -> Merge_NTPD
Dup_alg -> Alg_EvePD (EVE2) -> Alg_NTPD (DSP2) -> Merge_NTPD -> Sync_NTPD -> Alg_NTPDDraw -> Display_Video
GrpxSrc -> Display_Grpx

The average execution time of Alg_EvePD is 21 ms. And the average execution time of Alg_NTPD is 45 ms.

We have set Sync parameters as below
SyncNTPD->syncDelta = 100;
SyncNTPD->syncThreshold = 5000;

However Sync link is always dropping the frames,(in SyncThreshold check: sometimes diffTime is very high compared to threshold )
(in syncDelta check: sometimespBuffer->srcTimestamp is too less than higherTimeStamp)

This issue occurs only in VSDK 2.10. However when i tested same usecase using VSDK2.07 it works as expected.
Could you please guide me on how to fix the issue on VSDK2.10?

Regards,
Socrates

over 8 years ago

0 Alex Bashkov over 8 years ago

TI__Genius 13440 points

Socrates Paramasivam,

I have pinged Vision SDK experts for comments how to fix this glitch.

Thanks,

Alex

0 Brijesh Jadav over 8 years ago in reply to Alex Bashkov

TI__Guru**** 476505 points

Are you sure both the algorithms are taking less than 100ms?

SyncDelta will be used in syncing two frames, if their srcFrmTimeStamp is within 100ms, they are sync'ed.

But If the timestamps does not match, sync link will keep these frames for syncThreshold amount of time and after than it will drop this frame.

It looks like your frames are coming from dup link, so in this case, you could keep sync delta to be 1 or 2 ms.

SyncThreshold depends on your latency of the frame in the second path.

Regards,

Brijesh

0 Shiju Sivasankaran over 8 years ago in reply to Alex Bashkov

TI__Genius 13395 points

Hi
can you please check the "srcTimestamp" is correcly propogated in Alg_EvePD (EVE2) & Alg_NTPD (DSP2) links.
the output buffer should have copied srcTimestamp from the input buffer.

regards, Shiju

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TDA2SX: Sync Link frame drop issue