vmaf threads
时间: 2023-07-12 12:25:10 浏览: 48
VMAF (Video Multi-Method Assessment Fusion) is a video quality metric that is used to measure the subjective visual quality of encoded videos. In FFmpeg, VMAF can be computed using the libvmaf library, which supports multithreading for faster processing.
To enable multithreading for VMAF in FFmpeg, you can use the `-vmaf_threads` option followed by the number of threads you want to use. For example, to use 4 threads for VMAF computation, you can use the following command:
```
ffmpeg -i input.mp4 -c:v libx264 -b:v 2M -vmaf model_vmaf_v0.6.1.json -vmaf_threads 4 output.mp4
```
Note that the number of threads used for VMAF computation should not exceed the number of available CPU cores, as this may lead to decreased performance due to thread contention. In general, using multiple threads can speed up the VMAF computation for large videos or when using complex VMAF models. However, the actual performance gain will depend on the specific hardware configuration and input video characteristics.