H.264 Profiles and Levels

Different devices and browsers support different H.264 profiles and levels. Profiles are either baseline, main, high, extendedn, or constrained baseline (although specialty profiles, for example for stereo video, are possible).

The profile and level consists of three bytes. The first byte denotes the profile (42 = baseline, 4d = main, 64 = high). The second byte denotes the constraints, if any, as a bit field. The third byte denotes the level, multiplied by 10. For instance, 0x1f (31 decimal) corresponds to level 3.1.

Browsers

This is a partial list of browsers on various devices and operating systems, and the H.264 profiles they advertise in their SDP offer.

Browser	OS	Device	Profile
Safari	iOS 11	iPhone 6 Plus	42e01f
Safari	OS X 10.12.6	MacbookPro14,3	42e01f
Chrome	OS X 10.12.6	MacbookPro14,3	42001f
			42e01f
			4d0032
			640032

Devices

Device	Profile
Raspberry Pi Model 3B+	420028
	420029
	42002a
	4d0028
	4d0029
	4d002a
	640028
	640029
	64002a
Ambarella A5s	4d001f
Tesla Autopilot 2.0	424020