Changes between Version 92 and Version 93 of HWAccelIntro

Timestamp:

Jan 19, 2024, 9:53:58 PM (3 years ago)

Author:

Roger Pack

Comment:

hope this is right

HWAccelIntro

@@ -234 +234 @@
 }}}
 
-
-If ffmpeg was compiled with support for libnpp, it can be used to insert a GPU based scaler into the chain:
-{{{
-ffmpeg -hwaccel_device 0 -hwaccel cuda -i input -vf scale_npp=-1:720 -c:v h264_nvenc -preset slow output.mkv
+AV1 NVDEC HW decoding requires using -c:v av1:
+
+{{{
+ffmpeg -hwaccel nvdec -c:v av1 -i input_av1.mp4 output.ts
+}}}
+
+An example using scale_cuda and encoding in hardware, scale_cuda is available if compiled with ffnvcodec and `--enable-cuda-llvm` (default is on, requires nvidia llvm to be present at runtime):
+
+{{{
+ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i file.mkv -noautoscale -filter_complex [0:0]scale_cuda=1280:-2[out] -map [out] -c:v hevc_nvenc -cq 28 output.mp4
+}}}
+
+another example
+
+{{{
+ffmpeg -hwaccel_device 0 -hwaccel cuda -i input -vf scale_cuda=-1:720 -c:v h264_nvenc -preset slow output.mkv
 }}}
 
 The {{{-hwaccel_device}}} option can be used to specify the GPU to be used by the hwaccel in ffmpeg.
-
-AV1 NVDEC HW decoding requires using -c:v av1:
-
-
-{{{
-ffmpeg -hwaccel nvdec -c:v av1 -i input_av1.mp4 output.ts
-}}}
-
-Here's an example using scale_cuda and encoding in hardware, scale_cuda is available if compiled with ffnvcodec and `--enable-cuda-llvm` (default is on, requires nvidia llvm to be present at runtime):
-
-{{{
-ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i file.mkv -noautoscale -filter_complex [0:0]scale_cuda=1280:-2[out] -map [out] -c:v hevc_nvenc -cq 28 output.mp4
-}}}
 
 == cuda-nvcc and libnpp ==
@@ -263 +262 @@
 
 Both of these are basically "older" cuvid options that require the nvidia SDK to be present when compiled and run.  libnpp provides scale_npp (and a few other _npp filters).  They might have different options/flexibility than their XX_cuda equivalent.  Might be similar performance.  These have more funky licensing (nonfree).  cuda-nvcc has basically been replaced with ffnvcodec + cuda-llvm, scale_npp with scale_cuda.
+
+Example:
+
+{{{
+ffmpeg -hwaccel cuda -i input -vf scale_npp=-1:720 -c:v h264_nvenc -preset slow output.mkv
+}}}
+
 
 = libmfx (Intel Media SDK) =