I'm using nvencoder. the first encoding time and the second time are too different.

Gaming and Visualization Technologies Video Processing & Optical Flow
1

I’m using nvencoder.

The first time you run a file, the first and second time gap is too much, why do you know why?

--------------------------------------------------------------------------------------------------------- Encoding input : "Traffic_2560x1600_30_crop.yuv" output : "1.mp4" codec : "HEVC" size : 2560x1600 bitrate : 5000000 bits/sec vbvMaxBitrate : 0 bits/sec vbvSize : 0 bits fps : 30 frames/sec rcMode : CONSTQP goplength : INFINITE GOP B frames : 0 QP : 28 Input Format : YUV 420 preset : HP_PRESET Picture Structure : Frame Mode devicetype : CUDA

[ Input Filesize] : 921600000 bytes
Encoded 150 frames in 8745.59ms

--------------------------------------------------------------------------------------------------------- Encoding input : "Traffic_2560x1600_30_crop.yuv" output : "1.mp4" codec : "HEVC" size : 2560x1600 bitrate : 5000000 bits/sec vbvMaxBitrate : 0 bits/sec vbvSize : 0 bits fps : 30 frames/sec rcMode : CONSTQP goplength : INFINITE GOP B frames : 0 QP : 28 Input Format : YUV 420 preset : HP_PRESET Picture Structure : Frame Mode devicetype : CUDA

[ Input Filesize] : 921600000 bytes
Encoded 150 frames in 1177.17ms

2

You’re reading nearly 1GB from disk. This sounds like disk caching and a spinning rust HDD. Try priming the cache first, before your initial encode run. (e.g. play the yuv in VLC, or similar.)

3

THK.!!!