FLV to M4V Converter

How to Convert FLV to M4V Online

1. Upload Your FLV File: Drag and drop or click "Add Files" to select FLV files. Old YouTube downloads, Flash-era e-learning recordings, archived webinars, and screen captures from Flash-based streaming sites all work. Batch is supported.
2. Pick Video Codec and Quality: Default is H.264 — the codec every Apple device expects in an.m4v. Choose H.265 / HEVC for ~40% smaller files on iPhone 7+ and Apple TV 4K. Set a quality preset (Highest → Lowest), target a percentage of the original size or an exact file size in MB, or fine-tune with CRF (18 = visually lossless, 23 = default, 28 = smaller).
3. Resize or Trim (Optional): Pick a resolution preset (1080p / 720p / 480p / 360p), enter a custom width × height, scale by percentage, or trim using start time + duration in HH:MM:SS.sss format. Old FLV sources are usually 360p or 480p — upscaling won't add detail, so leave the resolution alone or downscale.
4. Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared. The output drops straight into iTunes or the Apple TV app.

Why Convert FLV to M4V?

FLV (Flash Video) was the dominant web video format from 2003 through about 2015 — the container YouTube, Vimeo, Dailymotion, and most streaming sites used during the Flash era. Adobe officially ended Flash Player support on December 31, 2020, and from January 12, 2021 onward Adobe blocked Flash content from running entirely. FLV files are now stranded — playable only in VLC or specialty converters. M4V is Apple's MPEG-4 container, introduced with the iTunes Store in 2006, designed to drop straight into the iTunes / Apple TV library with chapter markers, captions, and Dolby flags intact.

• Importing Flash-era archives into Apple TV / iTunes — Old YouTube downloads, recorded webinars, lecture captures, and corporate training videos saved as FLV during the Flash era. Convert to M4V and they appear in the Apple TV app's library or sync to an iPad over iCloud Drive without rejection.
• Playing on iPhone, iPad, and Apple TV — iOS does not support FLV at all, and even VLC for iOS struggles with old Flash codecs (Sorenson Spark, VP6, Nellymoser audio). M4V with H.264 + AAC plays natively on every Apple device made since the original iPhone in 2007.
• AirPlay to Apple TV — Apple TV's HLS-based AirPlay receiver expects MPEG-4 in either.mp4 or.m4v. FLV won't stream; M4V does, with hardware-accelerated H.264/HEVC decoding on Apple TV 4 and later.
• Cleaner library organization — The.m4v extension signals to iTunes / Apple TV that the file is a video meant for the library, distinct from generic.mp4 sharing files. Useful when consolidating decade-old downloads alongside Apple Store purchases.
• Smaller files than the FLV source — H.264 (and especially H.265) are 50-70% more efficient than FLV's typical Sorenson H.263 / VP6. A 100 MB FLV often becomes a 30-50 MB M4V at equal visual quality.
• Fixing playback issues — Many old FLVs have audio desync, partial corruption from interrupted downloads, or unsupported codecs. Re-encoding to M4V normalizes the file and resolves most playback problems.

FLV vs M4V — Format Comparison

Codec Choice for the M4V Output

Frequently Asked Questions

Why won't my FLV play on iPhone or Apple TV?

iOS and tvOS have never natively supported FLV. The format relied on Flash Player, which Apple famously refused to ship on iOS — Steve Jobs published "Thoughts on Flash" in 2010 explaining why. Even VLC for iOS struggles with the older codecs FLV typically carries (Sorenson Spark, VP6, Nellymoser audio). Converting to M4V puts the content into a container Apple devices play natively.

What's actually different between M4V and MP4?

Both are MPEG-4 Part 14 — the same container under the hood. The.m4v extension signals to iTunes and the Apple TV app that the file belongs to the library and may carry FairPlay DRM, chapter markers, captions, and Dolby audio flags. For DRM-free files the formats are functionally interchangeable. If you need to share with Windows / Android users instead, see FLV to MP4.

Should I pick H.264 or H.265?

H.264 is the safe default — it plays on every Apple device made since the original iPhone, and the encoding is fast. H.265 / HEVC produces files ~40% smaller at the same visual quality, but requires iPhone 7+ (2016), iPad Pro / Air 2+, Apple TV 4K, or macOS High Sierra+. If your library is going to a 2020s-era Apple TV, H.265 is the better long-term pick.

Will I lose quality converting FLV to M4V?

A small re-encoding loss is unavoidable since FLV's Sorenson H.263 / VP6 and M4V's H.264 / HEVC are different codecs. At CRF 18-22 the difference is invisible — and the M4V often looks subjectively cleaner because modern codecs handle the same content more efficiently. Old FLVs were typically encoded at low bitrates (the source quality is the cap), so don't expect the conversion to add detail that isn't there.

Will Apple TV recognize my converted M4V in the library?

Yes. Drop the M4V into the TV app's "Add to Library" or import via iTunes / the Music app on macOS. The file appears alongside Store purchases. You won't get the rich Apple metadata (poster art, episode info) automatically — you can add those manually with a tagger like Subler if it matters.

Can I batch convert multiple FLV files?

Yes — drop in entire folders of FLVs. They convert in parallel withon our servers and download individually or as a single ZIP. Useful for modernizing an archive of old YouTube downloads or Flash-era lecture captures into a tvOS-friendly library.

Can I trim or cut while converting?

Yes. Use the trim section to enter a start time and duration. Both accept seconds (12.5) or HH:MM:SS.sss format (00:01:30.500). Trim first to skip dead air, advertising bumpers, or test patterns common in old web video before they land in your Apple TV library.

What if my FLV is corrupted?

Many old FLVs have minor corruption from incomplete downloads or interrupted streaming captures. Re-encoding cleanly from the start sometimes fixes mild issues. For severely damaged FLVs, repair with VLC's "Save as" feature first, then convert the repaired file. If a file keeps failing, try FLV to MP4 — the looser MP4 muxer is occasionally more forgiving than the M4V one.