track_h264: avoid appending empty sps to fmtp line

[tmatth]

This avoids adding fmtp lines of the form "sprop-parameter-sets=" with no value (which leads to malformed SDPs).

[tmatth]

For context I noticed this behaviour when trying to figure out a regression in our usage of rtsp-simple-server since v0.17.17 where the profile-level-id is being stripped and these spurious sprop-parameter-sets= strings are added.

This doesn't completely fix our issue (as the profile-level-id is still being stripped) but I think makes sense on its own.

[aler9]

Hello, what's the name of the client that warns about malformed SDPs? i've seen a lot of cameras (mostly HikVision) that outputs an empty sprop-parameter-sets.

[tmatth]

Hello, what's the name of the client that warns about malformed SDPs? i've seen a lot of cameras (mostly HikVision) that outputs an empty sprop-parameter-sets.

Wireshark :laughing:

[tmatth]

bump

[github-actions[bot]]

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