Low transcoding performance with the latest release (v7.49)

[otuncelli]

I'm getting about 70% GPU Video Encoding engine utilization on my 1050 ti while transcoding a video with the latest version (v7.49)

7.48 doesn't have this problem. Everything else is the same.

Comparison 7.49 vs 7.48

More info:

• The input file is 8 bit
• Adding --avsw didn't make any difference
• Same problem with older driver (551.76)
• Turning lookahead off seems to be fixing the issue.

[bitspyer]

can confirmed this issue. with 7.49 there is a frame drop of aprox 40%

[otuncelli]

Also --tune uhq and --tune lossless give me error.

nvenc : Failed to Initialize the encoder
nvenc : .: 8 (NVENC indicates that one or more of the parameter passed to the API call is invalid.)

When I use an invalid value for --tune

Error: Invalid value "invalid" for "--tune"
  Option value should be one of below...
    auto, 0, 1, 2, 3

But these values are invalid as well.

Error: Invalid value "auto" for "--tune"
  Option value should be one of below...
    auto, 0, 1, 2, 3

[Jigsawbg]

@otuncelli --tune uhq -> "Tune presets for latency tolerant encoding for higher quality. Only supported for HEVC on Turing+ architectures" from SDK. You use Pascal architecture (GTX 1050 Ti). You need at least GTX 1630 which is Turing. For --lossless I don't know.

[otuncelli]

@otuncelli --tune uhq -> "Tune presets for latency tolerant encoding for higher quality. Only supported for HEVC on Turing+ architectures" from SDK. You use Pascal architecture (GTX 1050 Ti). You need at least GTX 1630 which is Turing.

Ah, I see. Thank you for the info.

[rigaya]

The performance drop was due to the new --lookahead-level option added in NVEnc 7.49, defaulted to auto.

I've changed the default to 0 in NVEnc 7.50, and will remove the performance drop.

[otuncelli]

Awesome! I can confirm the issue has been fixed.

I'm guessing performance drop on higher lookahead-levels is expected since I'm using a Pascal arch card.