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Diffstat (limited to 'doc/filters.texi')
| -rw-r--r-- | doc/filters.texi | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 9b5f4543b8..96dccc45be 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -11981,7 +11981,18 @@ Upload system memory frames to hardware surfaces. The device to upload to must be supplied when the filter is initialised. If using ffmpeg, select the appropriate device with the @option{-filter_hw_device} -option. +option or with the @option{derive_device} option. The input and output devices +must be of different types and compatible - the exact meaning of this is +system-dependent, but typically it means that they must refer to the same +underlying hardware context (for example, refer to the same graphics card). + +The following additional parameters are accepted: + +@table @option +@item derive_device @var{type} +Rather than using the device supplied at initialisation, instead derive a new +device of type @var{type} from the device the input frames exist on. +@end table @anchor{hwupload_cuda} @section hwupload_cuda |