I’m trying out the sample applications in the Nvidia video codec sdk, and am having trouble getting a usesable decoded result. My input files is YuV 4:2:0, taken from here which is 352x288px. I’m encoding using the
AppEncD3D12.exe sample, with the following command:
.\AppEncD3D12.exe -i D:\akiyo_cif.y4m -s 352x288 -o D:\akiyo_out.mp4
This gives the output
GPU in use: NVIDIA GeForce RTX 2080 Super with Max-Q Design [INFO ][17:46:39] Encoding Parameters: codec : h264 preset : p3 tuningInfo : hq profile : (default) chroma : yuv420 bitdepth : 8 rc : vbr fps : 30/1 gop : 250 bf : 1 multipass : 0 size : 352x288 bitrate : 0 maxbitrate : 0 vbvbufsize : 0 vbvinit : 0 aq : disabled temporalaq : disabled lookahead : disabled cq : 0 qmin : P,B,I=0,0,0 qmax : P,B,I=0,0,0 initqp : P,B,I=0,0,0 Total frames encoded: 112 Saved in file D:\akiyo_out.mp4
Which looks promising. However, using the decode sample, a single frame of the output contains what look like 12 smaller frames of the input, in monochrome. I’m running the decode sample like this:
PS D:\Nvidia\Video_Codec_SDK_11.1.5\Samples\build\Debug> .\AppDecD3D.exe -i D:\akiyo_out.mp4 GPU in use: NVIDIA GeForce RTX 2080 Super with Max-Q Design Display with D3D9. [INFO ][17:58:58] Media format: raw H.264 video (h264) Session Initialization Time: 23 ms [INFO ][17:58:58] Video Input Information Codec : AVC/H.264 Frame rate : 30000/1000 = 30 fps Sequence : Progressive Coded size : [352, 288] Display area : [0, 0, 352, 288] Chroma : YUV 420 Bit depth : 8 Video Decoding Params: Num Surfaces : 7 Crop : [0, 0, 0, 0] Resize : 352x288 Deinterlace : Weave Total frame decoded: 112 Session Deinitialization Time: 8 ms
I’m quite new to this so could be doing something stupid. Right now I don’t know whether to look at encode or decode! Any ideas or tips most appreciated.
-I’ve tried other YUV files with the same result. I read that 4:2:2 is not supported, the above is 4:2:0.
- Using the AppEncCuda sample, the decoded video (played with AppDecD3D.exe) is the correct size and in colour, but the video appears to scroll to the right as it is played, with colour information not scrolling at the same rate as the image