Worked around the random encoding hang issue due to incorrect number

[Austin-Hu]

of FIFO objects.

Signed-off-by: Austin Hu austin.hu@intel.com

As the 3rd (work around) option, to fix #497 , #514 .

[tianjunwork]

is lookAheadDistance alone good enough?

[Austin-Hu]

Unfortunately, either lookAheadDistance or intraPeriodLength alone isn't good enough...

[Austin-Hu]

With the PR applied, encoding performance could be increased. But memory consumption would be increased as its side effect, due to the increased number of Output FIFO objects, which take memory calculated by: EB_OUTPUTSTREAMBUFFERSIZE_MACRO * number_of_output_fifo, where EB_OUTPUTSTREAMBUFFERSIZE_MACRO depends on input resolution.

Some typical encoding performance and memory consumption comparison:

Command	Data Type	Without PR #512	With PR #512
./SvtHevcEncApp -i bbb_1920x1080_420p.yuv -w 1920 -h 1080 -n 5000 -b 0.265	Encoding Performance (FPS)	160	327
	Memory (GB)	2	2.4
./SvtHevcEncApp -i bbb_1920x1080_420p.yuv -w 1920 -h 1080 -encMode 0 -intra-period 100 -scd 0 -rc 0 -q 22 -n 1000 -b 0.265	Encoding Performance (FPS)	3.73	6.9
	Memory (GB)	2.2	2.5
./SvtHevcEncApp -i 7680x3840_P444.yuv -w 7680 -h 3840 -color-format 3 -b 0.265 -n 500	Encoding Performance (FPS)	16.56	18.25
	Memory (GB)	26.5	26.9

[tianjunwork]

Hi @Austin-Hu , I will re-enable out_alloc and increase stream output fifo to fix the hang issue. will close this one. Thank you for doing the profiling.