FLV to M4V Converter
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Supports: FLV
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Need help?How to Convert FLV to M4V
- Upload Your FLV File — Click "Choose Files" or drag and drop your Flash Video (FLV) file. Only .flv files are accepted.
- Choose Video Codec — Under Video Codec, the default for M4V output is H.264. Other options include H.265/HEVC, AV1, VP8, VP9, MPEG-4, and more.
- Set Video Quality — Under File Compression, choose from: Quality Preset (Highest through Lowest), Target File Size % (1-100% slider with Smart Scaling), Specific File Size (MB/KB), Constant Bitrate, Variable Bitrate, Constant Quality (CRF), or Constraint Quality.
- Set Audio Codec — Under Audio Codec, the default for M4V is AAC.
- Adjust Resolution (Optional) — Under Video Resolution, keep the original or choose Preset Resolutions (1080p, 720p, 480p, etc.), Fixed Resolutions, Resolution Percentage, or custom Width/Height/Width×Height.
- Trim (Optional) — Under Trim, set a Start Time and Duration to extract a specific segment.
- Convert & Download — Click "Convert" and download your M4V file.
Why Convert FLV to M4V?
FLV (Flash Video) was the dominant web video format in the 2000s, used by YouTube, Dailymotion, and countless websites. Since Adobe discontinued Flash Player in 2020, FLV files no longer play in modern browsers. M4V is Apple's video container — essentially MP4 optimized for iTunes and Apple devices. Converting FLV to M4V modernizes your old Flash videos for playback on iPhone, iPad, Apple TV, and in iTunes, preserving legacy web content in a format that works on current devices, and re-encoding with H.264 for better compression than the original FLV codec.
FLV vs M4V Comparison
| Feature | FLV (Flash Video) | M4V (Apple Video) |
|---|---|---|
| Video codec | Sorenson Spark or VP6 | H.264 (default) |
| Audio codec | MP3 or AAC | AAC (default) |
| Browser support | None (Flash discontinued) | Safari, QuickTime |
| Device support | VLC only | All Apple devices |
| File size (1 min, 720p) | 5-15 MB | 5-10 MB |
| Streaming | Legacy Flash streaming | HLS, iTunes |
| Best for | Archived web video | Apple ecosystem playback |
What happened to Flash Video?
Adobe ended Flash Player support on December 31, 2020. All major browsers removed Flash playback. FLV files can still be played in VLC or standalone Flash players, but converting to M4V (or MP4) is the recommended path for modern playback.
Which codec should I use?
H.264 with AAC audio (both defaults) is the standard for Apple devices and provides excellent compatibility. H.265 produces smaller files but requires newer hardware (iPhone 7+, Apple TV 4K+).
Will the quality improve after conversion?
No — converting cannot recover quality lost by the original FLV encoding. However, H.264 is more efficient than Sorenson Spark or VP6, so the M4V file may be smaller at equivalent visual quality.
What is the difference between M4V and MP4?
M4V and MP4 are nearly identical containers. M4V is Apple's variant that can include FairPlay DRM. Non-DRM M4V files are functionally the same as MP4. For maximum cross-platform compatibility, use FLV to MP4 instead.
Can I batch convert multiple FLV files?
Yes. Upload multiple FLV files at once and they will all be converted to M4V with the same settings. Click "Convert" and download each file individually or as a batch.
Can I adjust the resolution during conversion?
Yes. Under Video Resolution, choose Preset Resolutions (1080p, 720p, 480p, etc.), Fixed Resolutions, Resolution Percentage, or enter custom Width, Height, or Width×Height values. Lowering resolution reduces file size significantly.