FFMPEG utilize GPU

[doughnet]

telly release with the issue:
telly, version 1.1.0.8 (branch: dev, revision: 96424a4)
build user: root@7abd9a6a6502
build date: 20200704-05:23:36
go version: go1.12.17

Last working telly release (if known):

Operating environment (Docker/Windows/Linux/QNAP, etc.):
Ubuntu 20.04 (LXC)

Description of problem:
When use FFMpeg = true in the config file it properly uses FFMPEG but it does not utilize any available GPU. The FFMPEG that I have from build does have proper utilization of NVIDIA GPU.

Contents of telly.config.toml [if you're using a version above 1.1]:

• REMEMBER TO DELETE ANY CREDENTIALS IN CONFIG FILES OR COMMAND LINES

FFMpeg = true

Command line used to run telly [if applicable]:

• REMEMBER TO DELETE ANY CREDENTIALS IN CONFIG FILES OR COMMAND LINES

Docker run command used to run telly [if applicable]:

• REMEMBER TO DELETE ANY CREDENTIALS IN CONFIG FILES OR COMMAND LINES

telly or docker log:

Additional information:

[chazlarson]

telly just invokes ffmpeg with some flags; can the GPU be enabled with some flags?