So I looked in to this and double checked and it turns out there's a bug in Safari affecting the latest releases that seems to sometimes break video playback in the editor preview. It should still work after export, but the bug affecting preview could have confused your local testing when trying to find a format that works. It should be working better in r233. With that release I can definitely play a video in Safari on both macOS and iOS which MPC-HC reports as having the following format:
> Video: MPEG4 Video (H264) 640x360 24fps 612kbps [V: Apple Video Media Handler [eng] (h264 constrained baseline L3.0, yuv420p, 640x360, 612 kb/s)]
> Audio: AAC 22050Hz stereo 65kbps [A: Apple Sound Media Handler [eng] (aac lc, 22050 Hz, stereo, 65 kb/s)]
So yes, Safari does support MPEG-4 h.264 video with AAC audio.
Thanks but i'm using c2.
Also that happen on real device ios 10 11 12 13 and 14 (sound not working with mp4 h264).