Hello and thanks for replying.
Your information is very useful and i thank you!
My colleague uses an older version of ffmpeg and the specific
combination (including pix_fmt)
ffmpeg -y -hwaccel cuvid -c:v h264_cuvid
works without any errors.That was my question.I thought i was doing
something wrong or whatever.So i suppose that something has changed
from his version until mine(git latest).
So i have removed -pix_fmt yuv420p and everything works fine.
I also would like to search about the hwdownload option you have entered.
I don't want to change the pixel format(i don't know why you have
thought about it).
Is this the correct way to go?
ffmpeg -y -hwaccel cuvid -c:v h264_cuvid -deint 1 -vsync 1 -timeout
999999 -i foo \
-map 0:v -c:v h264_nvenc -preset slow -profile:v high -b:v 1300k -map
0:a:0 -c:a libfdk_aac -ac 2 -b:a 64k -strict experimental \
-f flv bar
Thanks again for your reply it was very useful and answered my question :)
On 7/25/2017 12:11 AM, James Girotti wrote:
On Mon, Jul 24, 2017 at 11:15 AM, tasos <[email protected]> wrote:
Hello.
I'm using
ffmpeg -y -c:v h264_cuvid -deint 1 -vsync 1 -timeout 999999 -i foo \
-map 0:v -c:v h264_nvenc -preset slow -profile:v high -b:v 1300k -pix_fmt
yuv420p -map 0:a -c:a libfdk_aac \
-ac 2 -b:a 64k -strict experimental -f mpegts foobar
and everything works fine.
When i add -hwaccel cuvid
ffmpeg -y -hwaccel cuvid -c:v h264_cuvid ...... the same as above
I get
Impossible to convert between the formats supported by the filter
'Parsed_null_0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:4
I have run into the same many times trying to do stuff with nvenc and
hwaccel. You're trying to apply a software filter, but you're telling
ffmpeg to do everything in hardware (-hwaccel), so it cannot apply the
filter hence the error. Doesn't matter though, as from what I can tell
nvenc will not change pixel formats for you. Your source is yuv420p, output
will be yuv420p. If you want to change output pixel format to yuv444p, you
could do something like:
ffmpeg -hwaccel cuvid -c:v h264_cuvid -i foo -c:v h264_nvenc -preset slow
-profile:v high444p \
-vf "hwdownload,format=nv12,format=yuv444p,hwupload_cuda" -an -f mpegts
./foobar.ts
This would do the pixel format conversion in software (you could do the
same for any software filter you might want to use). Nvenc then outputs in
yuv444p pixel format.
Of course if you convert to anything but yuv420p, then decoding with cuvid
will not work because only yuv420p is supported in hardware.
https://developer.nvidia.com/nvidia-video-codec-sdk#NVDECFeatures
HTH,
-James
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