MMS doesn’t have much bandwidth available and it’ll just compress instead of failing to send, so even android to android if you send a long enough HD video the recipient will get compressed garbage. Then, of course, there’s the fact any videos sent over MMS from android to an iPhone(and vice versa iirc) becomes compressed garbage no matter how long or HD the video was, but that’s more Apple’s fault than MMS directly.
MMS doesn’t have much bandwidth available and it’ll just compress instead of failing to send, so even android to android if you send a long enough HD video the recipient will get compressed garbage. Then, of course, there’s the fact any videos sent over MMS from android to an iPhone(and vice versa iirc) becomes compressed garbage no matter how long or HD the video was, but that’s more Apple’s fault than MMS directly.