h265 support

[Hollymingyi]

dear author，
do u have a plan to support h265? tranks anyway

[JackLau1222]

dear author， do u have a plan to support h265? tranks anyway

Of course, however, it will take more time for official FFmpeg support for more codecs (like h265, vp9 and so on).

Maybe I could create a branch that support h265 in this repo in weeks.