HLS: Support fMP4 as format for HLS

[winlinvip]

What is the business background? Please provide a description.
If want to support HEVC via HLS in Safari, you need to use fMP4 instead of TS in HLS.

Is your feature request related to a problem? Please describe.
Not able to play HLS HEVC via Safari.

Describe the solution you'd like
Use fMP4 instead of TS in HLS.

Describe alternatives you've considered
NO alternative.

Additional context
The fMP4 also save the bitrate for it's more effective than TS format.

[suzp1984]

#4159 was related to this issue, additional features needed are:

• Check HEVC Support
• fmp4 encryption

[winlinvip]

@suzp1984 Thank you very much. I think it's ok to support this feature through a few steps. The first step is to support a basic HLS with fMP4, without encryption, without HEVC support, just as your PR updated. Nevertheless, I think it should entail test and utest, which is crucial for a new feature, so could you please add more utests for this PR.

[suzp1984]

@suzp1984 Thank you very much. I think it's ok to support this feature through a few steps. The first step is to support a basic HLS with fMP4, without encryption, without HEVC support, just as your PR updated. Nevertheless, I think it should entail test and utest, which is crucial for a new feature, so could you please add more utests for this PR.

Sure

[winlinvip]

Feature: Support HLS with fmp4 segment for HEVC/LLHLS. v7.0.51 Merged.