Doom9's Forum - View Single Post - Intel SVT-AV1

Blue_MiSfit · 31st October 2019, 03:41

Okay I finally got 2 pass working. @quietvoid you're correct, you have to use -enc-mode-2p with -output-stat-file for the first pass and -enc-mode with -input-stat-file for the second pass.

Here's a quick example using the fastest speed preset and raw 8 bit yuv input, targeting 1080p at 3 Mbps VBR.

First Pass

Code:

svtav1encapp -i Beauty.yuv -w 1920 -h 1080 -fps-num 24000 -fps-denom 1001 -intra-period 96 -irefresh-type 2 -rc 2 -tbr 3000000 
-enc-mode-2p 8 -output-stat-file stats.file -b Beauty_svtav1_8_3000.ivf

Second Pass

Code:

svtav1encapp -i Beauty.yuv -w 1920 -h 1080 -fps-num 24000 -fps-denom 1001 -intra-period 96 -irefresh-type 2 -rc 2 -tbr 3000000 
-enc-mode 8 -input-stat-file stats.file -b Beauty_svtav1_8_3000.ivf

I get an output that decodes okay (and looks awful, predictably), but curiously there's an error during the second pass:

Error in freed returnVal 0

Odd.

Rate control seems to at least hit the target, it achieved 2995 Kbps which is within tolerance.

Any ideas on that error?

31st October 2019, 03:41	#13 \| Link
Blue_MiSfit Derek Prestegard IRL Join Date: Nov 2003 Location: Los Angeles Posts: 5,989	Okay I finally got 2 pass working. @quietvoid you're correct, you have to use -enc-mode-2p with -output-stat-file for the first pass and -enc-mode with -input-stat-file for the second pass. Here's a quick example using the fastest speed preset and raw 8 bit yuv input, targeting 1080p at 3 Mbps VBR. First Pass Code: svtav1encapp -i Beauty.yuv -w 1920 -h 1080 -fps-num 24000 -fps-denom 1001 -intra-period 96 -irefresh-type 2 -rc 2 -tbr 3000000 -enc-mode-2p 8 -output-stat-file stats.file -b Beauty_svtav1_8_3000.ivf Second Pass Code: svtav1encapp -i Beauty.yuv -w 1920 -h 1080 -fps-num 24000 -fps-denom 1001 -intra-period 96 -irefresh-type 2 -rc 2 -tbr 3000000 -enc-mode 8 -input-stat-file stats.file -b Beauty_svtav1_8_3000.ivf I get an output that decodes okay (and looks awful, predictably), but curiously there's an error during the second pass: Error in freed returnVal 0 Odd. Rate control seems to at least hit the target, it achieved 2995 Kbps which is within tolerance. Any ideas on that error? Last edited by Blue_MiSfit; 31st October 2019 at 07:55.