Add support for NVDEC (aka CUVID or CUDA) decoding using NVidia GPU through FFmpeg

[Peter Bennett]

VDPAU does not support video that is bigger than 1920x1080. VDPAU is not being updated.

NVDEC is a new API for accessing the GPU of NVidia devices.

[bjoernv]

Unfortunately H265/HEVC videos currently do not play with VDPAU playback profiles (tested with v30-Pre-1011-g7d6974a9b6, see ​https://pastebin.com/DYxWELE9). This worked with MythTV 29. A fix for VDPAU or NVDEC is very welcome.

[Peter Bennett]

Add support for nvdec decode and deinterlace

[Peter Bennett]

This patch adds the ability to decode and deinterlace using NVDEC with the NVidia GPU. At this level it is rather useless because the frames are still brought into main memory and then put back out to the GPU for display. With all the moving around of frames this is slower than using software decode. The next step is to add the direct transfer from decoder to OpenGL without going through system memory. I am looking at this but I may need some assistance from somebody who knows OpenGL.

With this patch it is not possible to change deinterlace methods on the fly, as deinterlace has to be set up before opening the decoder. Implementing change of deinterlace on the fly will require re-instantiating the decoder when changing deinterlace method.

[Peter Bennett <pbennett@…>]

In 718351757/mythtv:

FFmpeg: nv-codec-headers

These headers are needed for building FFmpeg with nvdec support.
These are from the FFmpeg/nv-codec-headers repository

Refs #13357

[Peter Bennett <pbennett@…>]

In dc34c5bb85/mythtv:

Playback: NVDEC decoding

NVDEC decoding for NVidia graphics adapters. This does not yet support
GPU to Video direct rendering. It works for video up to 4K but not
4K at 50fps. It also includes support for GPU based deinterlace.

Refs #13357

[Peter Bennett <pbennett@…>]

In 62d9915a3/mythtv:

FFmpeg: nv-codec-headers

These headers are needed for building FFmpeg with nvdec support.
These are from the FFmpeg/nv-codec-headers repository

Refs #13357

[Peter Bennett <pbennett@…>]

In 8eb463798c/mythtv:

Playback: NVDEC decoding

NVDEC decoding for NVidia graphics adapters. This does not yet support
GPU to Video direct rendering. It works for video up to 4K but not
4K at 50fps. It also includes support for GPU based deinterlace.

Refs #13357

[Peter Bennett <pbennett@…>]

In 0aa23ccfdf/mythtv:

NVDEC: Fix config error when FFmpeg cannot enable nvdec

Use FFmpeg auto detect to disable nvdec when dependencies are missing

Refs #13357

[Peter Bennett <pbennett@…>]

In ffdd5c4139/mythtv:

NVDEC: Fix config error when FFmpeg cannot enable nvdec

Use FFmpeg auto detect to disable nvdec when dependencies are missing

Refs #13357

(cherry picked from commit 0aa23ccfdfccc4e30f07ce14df2f85ae00bec344)

[Peter Bennett <pbennett@…>]

In f13a4feac/mythtv:

NVDEC: Fix compile error when nvdec is selected but vaapi is not selected

Refs #13357

[Peter Bennett <pbennett@…>]

In 4d7ebfa901/mythtv:

NVDEC: Fix compile error when nvdec is selected but vaapi is not selected

Refs #13357

(cherry picked from commit f13a4feac08248288f37b097f1aced09d5e69697)

[Peter Bennett <pbennett@…>]

In 136d40a968/mythtv:

NVDEC: Fix small problem with make clean

make clean should not delete files created by configure.

Refs #13357