path: root/DOCS
diff options
authorPhilip Langdale <>2017-05-29 09:48:10 -0700
committerwm4 <wm4@nowhere>2017-06-03 16:41:03 +0200
commit7424651b9637082f71deab9fcc87111e2d9df13f (patch)
treee5d4813a3195e56d39bd313900a765bc69d9e40d /DOCS
parent7e889e5e637536cba3dfced3962ab87d7c8ea01f (diff)
vo_opengl: hwdec_cuda: Support separate decode and display devices
In a multi GPU scenario, it may be desirable to use different GPUs for decode and display responsibilities. For example, if a secondary GPU has better video decoding capabilities. In such a scenario, we need to initialise a separate context for each GPU, and use the display context in hwdec_cuda, while passing the decode context to avcodec. Once that's done, the actually hand-off between the two GPUs is transparent to us (It happens during the cuMemcpy2D operation which copies the decoded frame from a cuda buffer to the OpenGL texture). In the end, the bulk of the work is around introducing a new configuration option to specify the decode device.
Diffstat (limited to 'DOCS')
1 files changed, 10 insertions, 0 deletions
diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst
index 925c501881..2e781e2272 100644
--- a/DOCS/man/options.rst
+++ b/DOCS/man/options.rst
@@ -4802,6 +4802,16 @@ The following video options are currently all specific to ``--vo=opengl`` and
This option might be silently removed in the future, if ANGLE fixes shader
compilation speed.
+ Choose the GPU device used for decoding when using the ``cuda`` hwdec.
+ By default, the device that is being used to provide OpenGL output will
+ also be used for decoding (and in the vast majority of cases, only one
+ GPU will be present).
+ Note that when using the ``cuda-copy`` hwdec, a different option must be
+ passed: ``--vd-lavc-o=gpu=<0..>``.