Linux/AM5708: Multiple H.264 decoding issue

Navneet Agarwal

Part Number: AM5708

Tool/software: Linux

Hi,

I am trying to open multiple decoding instances of (284x160@30 FPS) resolution on my AM5708 processor and it fails to open decoding instances (VIDDEC3_create with null return) after opening 5 such instances. I was just opening one Engine (Engine_open), so I changed my code to open multiple engines and added one decoding instances under each engine. But still its fails after opening max 4 engines.

Is there any limitation on maximum number of decoding instances that can be opened at a time. My use case is to open 20 instances of such resolution or even more with smaller resolution. What need to be done or what I am missing under configuration which can help me to open much such decoding instances.

Regards,

Navneet Agarwal

over 8 years ago

0 Margarita Gashova over 8 years ago

TI__Guru* 80190 points

Hello,

You could try to change this :
#define NUM_INSTANCE 5
in dce.c file under /ipumm/src/ti/framework/dce folder and rebuild the IPUMM firmware.

You could build the IPUMM firmware by following this user guide:
processors.wiki.ti.com/.../Processor_SDK_Building_The_SDK
the last step could be:
MACHINE=am57xx-evm bitbake ipumm-fw
or you could check this wiki:
processors.wiki.ti.com/.../Processor_Training:_Multimedia

BR
Margarita

0 Navneet Agarwal over 8 years ago in reply to Margarita Gashova

Prodigy 50 points

Thanks Margarita.

This was helpful. Can you also help us to know what should be ideal setup with having 24 decoding instances running. Should we go with single engine having 24 decoding instances or we should have multiple engines (say 4) and having 6 decoding instances under each engine ? How does engine and decoding instances work ?

Regards,

Navneet Agarwal

0 Navneet Agarwal over 8 years ago in reply to Navneet Agarwal

Prodigy 50 points

Also noticed that even though I change NUM_INSTANCE to 25, max decoding instance which gets open are close to 11 to 15. Its kind of random behavior as either decoding instances are failing to open or decoding frame starts failing for the instances already opened. If I just open 11 instances everything seems to be running smooth.

0 Margarita Gashova over 8 years ago in reply to Navneet Agarwal

TI__Guru* 80190 points

Hello,

You could run cat /sys/kernel/debug/remoteproc/remoteproc1/trace0 to check if the failure is due to non-availability of memory.
IPUMM firmware reserves 40MB for codec’s heap memory. If the NUM_INSTANCE definition is set to support more instances the memory of 40MB could be not sufficient. Probably this is the reason to observe the failure.

BR
Margarita

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Linux/AM5708: Multiple H.264 decoding issue