Changes between Version 75 and Version 76 of Encode/H.264

Timestamp:

Aug 9, 2020, 12:56:24 AM (8 weeks ago)

Author:

megapro17

Comment:

OpenCL enabling for GPU

Encode/H.264

@@ -95 +95 @@
 
 {{{
-ffmpeg -i input.avi -c:v libx264 -preset slow -crf 22 -c:a copy output.mkv
+ffmpeg -i input -c:v libx264 -preset slow -crf 22 -c:a copy output.mkv
 }}}
 
@@ -238 +238 @@
 Refer to the `-vpre` output option in the [https://ffmpeg.org/ffmpeg.html#Preset-files documentation].
 
+== OpenCL ==
+
+To enable OpenCL lookahead add `-x264opts opencl` or `-x264-params opencl=true` to your command line. It will give a slight encoding speed boost using GPU, without hurting quality.
+
+You will see `Compiling OpenCL kernels...` or `OpenCL acceleration enabled with NVIDIA ...`, also file `x264_lookahead.clbin` will be created, which can deleted safely after encoding.
+
+Don't forget about [https://trac.ffmpeg.org/wiki/HWAccelIntro/ HWAccel] too, e.g.: `-hwaccel auto -i input`
+
+
 ----
 
@@ -265 +274 @@
 
 If your input files are RGB, it's the RGB to YUV color space conversion. Use `-c:v libx264rgb` instead.
-
-== Will a graphics card make x264 encode faster? ==
-
-For x264 specifically, probably not. [https://code.videolan.org/videolan/x264/-/commit/f49a1b2ef6d95d8f0f186df0fc3bfe38414e264f x264 supports OpenCL] for some lookahead operations.
 
 See [[HWAccelIntro]] for information on supported hardware H.264 encoders and decoders.