Check for HW accelerated encoding and decoding

[g-maxime]

No description provided.

[JeromeMartinez]

@g-maxime possible to test both SW DPX + HW FFV1 and HW DPX + HW FFV1?
For HW DPX, run the command also if the HW DPX does not support the DPX flavor in order to be sure that we have no loss whatever is command line used by the user.

[g-maxime]

@g-maxime possible to test both SW DPX + HW FFV1 and HW DPX + HW FFV1? For HW DPX, run the command also if the HW DPX does not support the DPX flavor in order to be sure that we have no loss whatever is command line used by the user.

Added hwdpx and swdpw variants for the encoding check