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i have some videos that i would like to convert to become suitable for my iPad air and iPhone 4s, but i can play around with the audio and video format (ex: video codec, video bitrate, frame rate, video aspect, audio codec, audio bitrate, sample rate) which i don't know which best suits them. i am using "any video converter" to do this, if any one has any idea how to do this please tell.

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iOS Devices only support natively MP4 H.264.

By natively I mean, it is the only format with hardware acceleration. Using hardware acceleration instead of software decoding will save you some battery time.

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