On 09/09/2016 04:17 PM, Leandro Raffo wrote:
2016-09-09 15:59 GMT-03:00 Charles <[email protected]>:
I'm trying to encode AVFrames using the GPU from C code, so I was
trying to see how ffmpeg's source code was doing it and asking for a
pointer on it (or its location lol). I've already encoded directly
with ffmpeg (to see its working) but I need to encode random AVFrames
not an entire video. Also giving a yuv420 video to the Nvidia ENC
samples produces a corrupted video.
nvenc is going to encode yuv video into h264 stream, I am not sure the
output format is what you want.
To get "random" frames encoded, you will have to do something like GOP=1 and
mark all frames key frames somehow.
Sounds like you are trying to create a slide show from random frames in a
video stream?
Pure theory YMMV...
If you want to use nvenc directly you need to transform AVFrame to
EncodeFrameConfig
See
NVENCSTATUS CNvEncoder::EncodeFrame(EncodeFrameConfig *pEncodeFrame, bool
bFlush, uint32_t width, uint32_t height)
Should be able to create your own convertAvFrametoEncoded
REF: convertYUVpitchtoNV12 convertYUVpitchtoYUV444
Setting ecoded->yuv[0], encoded->yuv[1], encoded->yuv[2], dstwidth,
dstheight from
av_frame->data[0] av_frame->data[1] av_frame->data[2], av_frame->width,
av_frame->height, av_frame->linesize
but I think the output will not be a "VIDEO FRAME"
Thanks
cco
I have RGB images of a video that I was converting to AVFrames and I
wanted to encode in real time without incurring in heavy CPU usage.
Basically offload the hard part to the GPU. I thought ffmpeg api would
expose some kind of functionality for this (I've seen code doing
decoding with VDPAU). I'll keep checking the nvidia examples( I was
avoiding them mainly because of the amount of boilerplate that I don't
have a clue what is doing and because it encoded garbage.) and see If
I can do it with your pointers. Thanks!
If you use ffmpeg and specify the h264_nvenc it will use almost no cpu
Here is a mostly working example, it runs as a pthread just push frames (RGB)
https://gist.github.com/LinuxwitChdoCtOr/1fbfc44443de8f0fcf6a742f5562376d
You will need to specify which h264 enoder to use if you have more than one
Just FYI it is still a lot of code
Thanks
cco
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