F4V stores H.264 video and AAC audio in Adobe's Flash-compatible MPEG-4 container. The iPhone Video preset creates H.264 1080p MP4 files specifically optimized for Apple's iPhone hardware decoder and smaller display size. This conversion transforms unplayable Flash video into content perfectly suited for iPhone's screen and storage constraints.

iPhones have never supported Flash Player — Apple's refusal to support Flash on iOS was a key factor in Flash's decline. Converting F4V to the iPhone Video preset produces files tailored to iPhone's hardware capabilities: H.264 with the right profile for hardware decoding, bitrate scaled for a 6-inch display, and fast-start enabled for instant playback from the Photos or Files app.

The iPhone Video preset outputs H.264 High Profile Level 4.1 at 1920x1080 with a target bitrate of 4-6 Mbps — optimized for iPhone's 6.1-6.7 inch displays where higher bitrates provide diminishing returns. AAC-LC stereo at 128 kbps / 44.1 kHz handles audio. The moov atom is placed at the beginning of the file for instant playback start. Color space metadata is set to BT.709 for correct rendering on iPhone's P3 wide color gamut displays.

Resolution: 1920x1080

Bitrate: 8-12 Mbps

H.264 recommended for fast processing

Resolution: 1080x1080

Bitrate: 3.5 Mbps

Square or 9:16 for Reels

Resolution: 1080x1920

Bitrate: 4 Mbps

9:16 vertical, under 60s ideal

Resolution: 1280x720

Bitrate: 5 Mbps

Under 140s, 512MB max

Resolution: 960x540

Bitrate: 2 Mbps

16MB limit for standard, 64MB for document

Resolution: 1280x720

Bitrate: 4 Mbps

8MB free, 50MB Nitro

All iPhones from iPhone 5s (2013) onward support H.264 High Profile 1080p. This covers every iPhone still receiving software updates.

Yes. The output MP4 is fully compatible with iTunes/Finder sync, iCloud Photos, and the Files app on iPhone.

At 4-6 Mbps, expect about 30-45 MB per 10 minutes of video. A two-hour movie would be approximately 400-650 MB.

Yes. AirPlay supports H.264 MP4 natively, so you can stream the converted file to Apple TV, HomePod with display, or AirPlay-compatible TVs.

The converter preserves the original aspect ratio with letterboxing if needed. F4V files from Flash players sometimes use 4:3 — the output will have black bars on a 16:9 iPhone screen.

Device	F4V	iPhone Video
Windows PC	Partial	Partial
macOS	Partial	Partial
iPhone/iPad	Partial	Partial
Android	Partial	Partial
Linux	Partial	Partial
Web Browser	No	No

特徴	F4V	iPhone Video
正式名称	Flash MP4 Video	iPhone Compatible Video
拡張子	.f4v	.mp4
最適な用途	MPEG-4 based	iPhone optimized

Convert F4V to iPhone Video — Free Online Converter

F4VからiPhone Videoへの変換について

F4VをiPhone Videoに変換する理由

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他の形式をiPhone Videoに変換

F4VとiPhone Videoの比較