ffmpeg transcode H.265 to H.264 by Nvidia CUDA error

[slick zheng]

i have a video file with H.265, and i want to transcode it into H.264 in a Nvidia T4 vm, here is my command

[Attachment 72840 - Click to enlarge]
ffmpeg -hide_banner -hwaccel cuda -hwaccel_output_format cuda -i UPL_MmrXRhwoub.mp4 -c:v h264_nvenc output.mp4

but i got a error like this:

[hevc @ 0x5567877726c0] Skipping NAL unit 62
[hevc @ 0x5567876e2c00] Skipping NAL unit 62
[hevc @ 0x5567876f3040] Skipping NAL unit 62
[h264_nvenc @ 0x5567869ba480] Provided device doesn't support required NVENC features
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

does anyone who know how to solve this problem?

[ProWo]

Try

ffmpeg -hide_banner -hwaccel cuda -hwaccel_output_format cuda -i UPL_MmrXRhwoub.mp4 -c:v h264_nvenc -c:a copy -dn output.mp4

[pandy]

But NVEnc is not CUDA... NVidia suggest something like this https://developer.nvidia.com/blog/turing-h264-video-encoding-speed-and-quality/

I will be not surprised if vm prevent to use NVEnc by ffmpeg.

[ProWo]

But NVEnc is not CUDA... NVidia suggest something like this https://developer.nvidia.com/blog/turing-h264-video-encoding-speed-and-quality/

I will be not surprised if vm prevent to use NVEnc by ffmpeg.

Read:
https://trac.ffmpeg.org/wiki/HWAccelIntro

[slick zheng]

Try

ffmpeg -hide_banner -hwaccel cuda -hwaccel_output_format cuda -i UPL_MmrXRhwoub.mp4 -c:v h264_nvenc -c:a copy -dn output.mp4

this command is same error, it doesn't work

[slick zheng]

But NVEnc is not CUDA... NVidia suggest something like this https://developer.nvidia.com/blog/turing-h264-video-encoding-speed-and-quality/

I will be not surprised if vm prevent to use NVEnc by ffmpeg.

do you know how to solve this problems?

[ProWo]

Try

ffmpeg -hide_banner -hwaccel cuda -hwaccel_output_format cuda -i UPL_MmrXRhwoub.mp4 -c:v h264_nvenc -c:a copy -dn output.mp4

this command is same error, it doesn't work

And with

ffmpeg -vsync 0 -hwaccel cuvid -i UPL_MmrXRhwoub.mp4 -c:v h264_nvenc -an -dn output.mp4

Your Nvidia GPU is updatet with the newest drivers?

[sophisticles]

If all you want to do is encode using the built in Nvidia encoding chip. all you need is:

ffmpeg -i input -c:v h264_nvenc -profile high444p -pixel_format yuv444p -preset default output.mp4

This is an example. you can leave out -profile high444p -pixel_format yuv444p doe 8-bit 420 encoding.

The -hwaccel cuda -hwaccel_output_format cuda is for hardware accelerated decoding of the source, this is useful if you have a slower cpu and the source format can be accelerated by nvdec.

For the sake of simplicity, i recommend you let ffmpeg decode the way it sees fit.

[slick zheng]

Try

ffmpeg -hide_banner -hwaccel cuda -hwaccel_output_format cuda -i UPL_MmrXRhwoub.mp4 -c:v h264_nvenc -c:a copy -dn output.mp4

this command is same error, it doesn't work

And with

ffmpeg -vsync 0 -hwaccel cuvid -i UPL_MmrXRhwoub.mp4 -c:v h264_nvenc -an -dn output.mp4

Your Nvidia GPU is updatet with the newest drivers?

i work with this command:
ffmpeg -loglevel verbose -hwaccel cuvid -hwaccel_output_format cuda -i input.mp4 -vf format=yuv420p -c:v h264_nvenc output.mp4
but the speed is too slow, just 1.6x, it's not normal, my CUDA version is 12.2, ffmpeg version is 4.2.7-0ubuntu0.1

[slick zheng]

If all you want to do is encode using the built in Nvidia encoding chip. all you need is:

ffmpeg -i input -c:v h264_nvenc -profile high444p -pixel_format yuv444p -preset default output.mp4

This is an example. you can leave out -profile high444p -pixel_format yuv444p doe 8-bit 420 encoding.

The -hwaccel cuda -hwaccel_output_format cuda is for hardware accelerated decoding of the source, this is useful if you have a slower cpu and the source format can be accelerated by nvdec.

For the sake of simplicity, i recommend you let ffmpeg decode the way it sees fit.

this command has below error:
[h264_nvenc @ 0x55e5a1f276c0] No NVENC capable devices found

[sophisticles]

this command has below error:
[h264_nvenc @ 0x55e5a1f276c0] No NVENC capable devices found

There's your answer, either the video card you have does not support nvenc, meaning it's quite old because this has been around for years or the drivers you are using are faulty.

What are your system specs, specifically OS and video card?

[pandy]

But NVEnc is not CUDA... NVidia suggest something like this https://developer.nvidia.com/blog/turing-h264-video-encoding-speed-and-quality/

I will be not surprised if vm prevent to use NVEnc by ffmpeg.

Read:
https://trac.ffmpeg.org/wiki/HWAccelIntro

Did you read provided link - CUVID is for decode, for encode there is only NVEnc. Also NVidia provided syntax has nothing with CUDA.

[pandy]

But NVEnc is not CUDA... NVidia suggest something like this https://developer.nvidia.com/blog/turing-h264-video-encoding-speed-and-quality/

I will be not surprised if vm prevent to use NVEnc by ffmpeg.

do you know how to solve this problems?

Use already provided link - there is ffmpeg usage case - copy it and verify if you have access to NVEnc - ffmpeg returns information that there is no NVENC - verify iof you have proper ffmpeg build and all required resources.

[slick zheng]

this command has below error:
[h264_nvenc @ 0x55e5a1f276c0] No NVENC capable devices found

There's your answer, either the video card you have does not support nvenc, meaning it's quite old because this has been around for years or the drivers you are using are faulty.

What are your system specs, specifically OS and video card?

os is ubuntu 20.04，video card is Nvidia T4, CUDA version is 12.2, ffmpeg version is 4.2.7

[slick zheng]

But NVEnc is not CUDA... NVidia suggest something like this https://developer.nvidia.com/blog/turing-h264-video-encoding-speed-and-quality/

I will be not surprised if vm prevent to use NVEnc by ffmpeg.

do you know how to solve this problems?

Use already provided link - there is ffmpeg usage case - copy it and verify if you have access to NVEnc - ffmpeg returns information that there is no NVENC - verify iof you have proper ffmpeg build and all required resources.

i test the nvidia test command ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4, also has this problem
test command is from here
also from https://trac.ffmpeg.org/wiki/HWAccelIntro#CUDANVENCNVDEC i see full transcode command is
ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input -c:v h264_nvenc -preset slow output
and this is also error

[pandy]

i test the nvidia test command ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4, also has this problem
test command is from here
also from https://trac.ffmpeg.org/wiki/HWAccelIntro#CUDANVENCNVDEC i see full transcode command is
ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input -c:v h264_nvenc -preset slow output
and this is also error

NVidia for NVEnc propose this:

High Quality: -c:v h264_nvenc -preset medium -b:v BITRATE -bufsize BITRATE*2 -profile:v high -bf 3 -b_ref_mode 2 -temporal-aq 1 -rc-lookahead 20 -vsync 0

Transcode may imply explicit call for NVDec decoder.

Once again - verify if your ffmpeg build support NVEnc - try this

ffmpeg -h encoder=h264_nvenc >h264_nvenc.txt

and

ffmpeg -h decoder=hevc_cuvid >hevc_cuvid.txt

[slick zheng]

i test the nvidia test command ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4, also has this problem
test command is from here
also from https://trac.ffmpeg.org/wiki/HWAccelIntro#CUDANVENCNVDEC i see full transcode command is
ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input -c:v h264_nvenc -preset slow output
and this is also error

NVidia for NVEnc propose this:

High Quality: -c:v h264_nvenc -preset medium -b:v BITRATE -bufsize BITRATE*2 -profile:v high -bf 3 -b_ref_mode 2 -temporal-aq 1 -rc-lookahead 20 -vsync 0

Transcode may imply explicit call for NVDec decoder.

Once again - verify if your ffmpeg build support NVEnc - try this

ffmpeg -h encoder=h264_nvenc >h264_nvenc.txt

and

ffmpeg -h decoder=hevc_cuvid >hevc_cuvid.txt

i tested two command.
1: ./ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i UPL_1vKBpdd4iX.mp4 -c:a copy -c:v h264_nvenc -b:v 5M -vf scale_cuda=format=yuv420p output2.mp4
2: ./ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i UPL_1vKBpdd4iX.mp4 -c:a copy -c:v h264_nvenc -b:v 5M -vf output2.mp4

1 is work, 2 will display the error message, i wan't to know why nvenc encoder require scale_cuda filter

[october262]

i test the nvidia test command ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4, also has this problem
test command is from here
also from https://trac.ffmpeg.org/wiki/HWAccelIntro#CUDANVENCNVDEC i see full transcode command is
ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input -c:v h264_nvenc -preset slow output
and this is also error

NVidia for NVEnc propose this:

High Quality: -c:v h264_nvenc -preset medium -b:v BITRATE -bufsize BITRATE*2 -profile:v high -bf 3 -b_ref_mode 2 -temporal-aq 1 -rc-lookahead 20 -vsync 0

Transcode may imply explicit call for NVDec decoder.

Once again - verify if your ffmpeg build support NVEnc - try this

ffmpeg -h encoder=h264_nvenc >h264_nvenc.txt

and

ffmpeg -h decoder=hevc_cuvid >hevc_cuvid.txt

i tested two command.
1: ./ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i UPL_1vKBpdd4iX.mp4 -c:a copy -c:v h264_nvenc -b:v 5M -vf scale_cuda=format=yuv420p output2.mp4
2: ./ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i UPL_1vKBpdd4iX.mp4 -c:a copy -c:v h264_nvenc -b:v 5M -vf output2.mp4

1 will display the error message, 2 is work, i wan't to know why nvenc encoder require scale_cuda filter

try adding either -preset hq or preset p4 after your input file and see if it'll work - https://www.reddit.com/r/ffmpeg/comments/juvioh/ffmpeg_error_provide_device_doesnt_support/

[slick zheng]

i test the nvidia test command ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i input.mp4 -c:a copy -c:v h264_nvenc -b:v 5M output.mp4, also has this problem
test command is from here
also from https://trac.ffmpeg.org/wiki/HWAccelIntro#CUDANVENCNVDEC i see full transcode command is
ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input -c:v h264_nvenc -preset slow output
and this is also error

NVidia for NVEnc propose this:

High Quality: -c:v h264_nvenc -preset medium -b:v BITRATE -bufsize BITRATE*2 -profile:v high -bf 3 -b_ref_mode 2 -temporal-aq 1 -rc-lookahead 20 -vsync 0

Transcode may imply explicit call for NVDec decoder.

Once again - verify if your ffmpeg build support NVEnc - try this

ffmpeg -h encoder=h264_nvenc >h264_nvenc.txt

and

ffmpeg -h decoder=hevc_cuvid >hevc_cuvid.txt

i tested two command.
1: ./ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i UPL_1vKBpdd4iX.mp4 -c:a copy -c:v h264_nvenc -b:v 5M -vf scale_cuda=format=yuv420p output2.mp4
2: ./ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i UPL_1vKBpdd4iX.mp4 -c:a copy -c:v h264_nvenc -b:v 5M -vf output2.mp4

1 will display the error message, 2 is work, i wan't to know why nvenc encoder require scale_cuda filter

try this command - ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i input -c:v h264_nvenc -preset slow output
https://superuser.com/questions/1676886/i-need-ffmpeg-command-to-convert-some-video-fi...264-with-nvidi

this command is same error