Doom9's Forum - View Single Post - Updated (Grainy Source): x264 vs x265 vs NVENC H.265 vs QSV H.265 [2-pass @ 5000kbps]

tonemapped · 16th July 2021, 12:11

I'm currently working on some new comparisons, but keeping the logs and doing the following tests (all at 2-pass/QSV at CRF but same bitrate):

▶ Nvidia NVENC H265 @ 5000kbps, P7, 10-bit
▶ x264 @ 5000kbps, veryslow, 8-bit
▶ x265 @ 5000kbps, slow, waggoner (settings suggested above), 10-bit [slow & veryslow is too slow to justify encoding, but doing so for testing]
▶ x265 @ 5000kbps, slow, grain, 10-bit [slow & veryslow is too slow to justify encoding, but doing so for testing]
▶ Intel QSV @ 5080kbps, ICQ, 'best quality', 10-bit [2-pass not available]

They are completing now, but it's 31°C in my office so might need to wait until later to do them all (it's hot).

These should provide a fairer comparison, and the logs should be useful as well. I'm thinking of posting three screenshots per encode and would post the four minute clip but clearly copyright is an issue. I could technically cut 30 seconds from each one but then I wouldn't know where to upload it.

16th July 2021, 12:11	#15 \| Link
tonemapped Video Fanatic Join Date: Jul 2021 Location: Surrey Posts: 89	I'm currently working on some new comparisons, but keeping the logs and doing the following tests (all at 2-pass/QSV at CRF but same bitrate): ▶ Nvidia NVENC H265 @ 5000kbps, P7, 10-bit ▶ x264 @ 5000kbps, veryslow, 8-bit ▶ x265 @ 5000kbps, slow, waggoner (settings suggested above), 10-bit [slow & veryslow is too slow to justify encoding, but doing so for testing] ▶ x265 @ 5000kbps, slow, grain, 10-bit [slow & veryslow is too slow to justify encoding, but doing so for testing] ▶ Intel QSV @ 5080kbps, ICQ, 'best quality', 10-bit [2-pass not available] They are completing now, but it's 31°C in my office so might need to wait until later to do them all (it's hot). These should provide a fairer comparison, and the logs should be useful as well. I'm thinking of posting three screenshots per encode and would post the four minute clip but clearly copyright is an issue. I could technically cut 30 seconds from each one but then I wouldn't know where to upload it. Last edited by tonemapped; 16th July 2021 at 12:18.