Changes between Version 41 and Version 42 of HWAccelIntro

Timestamp:

Oct 30, 2016, 1:40:24 PM (10 years ago)

Author:

Timo R.

Comment:

--

HWAccelIntro

@@ -134 +134 @@
 }}}
 
+== CUDA/CUVID ==
+
+CUVID, which is also called nvdec by Nvidia now, can be used for decoding on Windows and Linux.
+In combination with nvenc it offers full hardware transcoding.
+
+CUVID offers decoders for H264, HEVC, H263, MJPEG, mpeg1/2/4, vp8/9, vc1.
+Codec support varies by hardware. The full set of codecs being available only on Pascal hardware, which adds VP9 and 10 bit support.
+
+While decoding 10 bit video is supported, CUVID is only able to output 8 bit video, so the additional 2 bits are lost in the process.
+
+Sample decode using CUVID, the cuvid decoder copies the frames to system memory in this case:
+{{{
+ffmpeg -c:v h264_cuvid -i input output.mkv
+}}}
+
+Full hardware transcode with CUVID and NVENC:
+{{{
+ffmpeg -hwaccel cuvid -c:v h264_cuvid -i input -c:v h264_nvenc -preset slow output.mkv
+}}}
+
+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 cuvid -c:v h264_cuvid -i input -vf scale_npp=-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 cuvid hwaccel in ffmpeg.
+
 == Intel QSV ==