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rigaya / QSVEnc

QSVによる高速エンコードの性能実験
http://rigaya34589.blog135.fc2.com/blog-category-10.html
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vp9 encoding--changing cqp or icq value has no effect #166

Closed wwaag76 closed 9 months ago

wwaag76 commented 10 months ago

I've been doing some test encoding using vp9. Changing the cq value for either the cqp icq mode has no effecte on the bitrate of the rendered file. The bitrate in icq is extremely low, 528 kb/sec while the bitrate in cqp mode is always high at 65 mb/sec.

Here is the generic command line I'm using for icq.
qsvencc64 -i inAVSfile --codec vp9 --icq 20 --quality balanced --audio-source inTempWavFile:codec=aac;bitrate=128;delay=44 -o outFile.mp4

Use of bitrate modes works OK.

rigaya commented 10 months ago

With Intel Arc A380, VP9 --cqp did had effect on bitrate, although it didn't really go down to low bitrate. --icq had no effect as you have mentioned.

Anyway QSV VP9 has poor quality, I recommend to use H264, HEVC, or AV1.

wwaag76 commented 10 months ago

Thanks for your reply. I was using an Intel Arc 770. As mentioned, bitrate modes still work OK. Consider this closed.