Flash Video (.FLV)
FLV (Flash Video) is a container format that was used to deliver video content over the internet via Adobe Flash Player. It typically contains video encoded with Sorenson Spark or VP6 codecs and audio in MP3 or AAC format. FLV was once the dominant web video format but became obsolete after major browsers discontinued Flash Player support in 2020.
Advantages of Flash Video
What the FLV format does well, and why you might choose it.
- Compact file sizes with acceptable streaming quality
- Simple container structure that is quick to parse
- Large existing archive of legacy web video content
Limitations of Flash Video
What the FLVformat doesn't do well, and when to choose another format.
- Obsolete format since Adobe Flash Player reached end-of-life in 2020
- No modern browser supports FLV playback without third-party tools
- Limited codec support compared to modern containers like MP4
What FLV files are used for
- Legacy web video archives and content migration
- Converting old Flash-based video content to modern formats
- Historical video content from early streaming platforms
How FLV files work
Video files are containers (MP4, MOV, MKV, WebM, AVI) that wrap one or more video streams (compressed by a codec like H.264, H.265/HEVC, VP9, or AV1), an audio track (AAC, AC3, OPUS), and optional subtitle and metadata tracks. The container determines compatibility, metadata support, and what kinds of streams it can hold; the codec determines compression efficiency and CPU/GPU cost to decode. Bitrate, frame rate, color space (Rec.709 for HD, Rec.2020 for HDR), and chroma subsampling (4:2:0, 4:2:2, 4:4:4) all affect quality and file size.
Best practices when working with FLV
Edit a transcoded intermediate (ProRes, DNxHD, or constant-bitrate H.264) — direct H.265 or AV1 source is brutal on the CPU during scrubbing and can cause dropped frames in playback. Master once, export targeted distribution copies (MP4 with H.264 for compatibility, WebM with VP9/AV1 for modern browsers). Keep audio at a higher bitrate than you think you need — audio is a small fraction of total file size and lousy audio ruins good video. Chapter markers, embedded subtitles, and color metadata get lost when reformatting between containers, so include them explicitly at export time.
Convert to FLV
The most common formats people convert to FLV, ready to convert in seconds.
Convert FLV to other formats
Convert Flash Video files into the format you actually need.
Choosing FLV versus the alternatives
MP4 + H.264 + AAC: the universally-compatible choice. Plays everywhere, supported by every editor, the right answer for almost every distribution scenario. MP4 + H.265: half the file size, but slow encoding and patchy support outside the latest devices. WebM + VP9 or AV1: efficient and royalty-free, perfect for modern web video, no support on legacy devices. MOV: Apple's container, mostly equivalent to MP4 but better integrated with Final Cut Pro. MKV: maximum flexibility, multiple audio/subtitle tracks, but inconsistent support outside dedicated media players.
Where FLV fits in real workflows
Video pipelines have three stages: capture (camera-native or transcoded intermediate), edit (an editing-friendly intermediate codec), and deliver (a tightly-tuned distribution master per platform). Conversion happens at every transition. Choosing intermediate and delivery codecs intentionally — instead of just leaving everything as direct camera output — saves storage, edit time, and re-encoding when delivery requirements change.
Privacy and file handling
When you convert a FLVfile with MegaConvert, the file is uploaded to our converter, processed, and automatically deleted within an hour. We don't train models on your files, share them with third parties, or retain them after the conversion completes. The download link expires when the file is removed. If your work involves files subject to NDA or compliance requirements (HIPAA, GDPR data processing), please review our privacy policy before uploading sensitive material.
Frequently asked questions about FLV
What is a .FLV file?
FLV (Flash Video) is a container format that was used to deliver video content over the internet via Adobe Flash Player. It typically contains video encoded with Sorenson Spark or VP6 codecs and audio in MP3 or AAC format. FLV was once the dominant web video format but became obsolete after major browsers discontinued Flash Player support in 2020.
What is the MIME type of FLV?
The official MIME type for FLV files is video/x-flv. This is the value web servers and applications use to identify the format when transferring files.
What category does FLV belong to?
FLV is a Video Converter format. Files in this category share common conversion paths and use cases.
How do I open a .FLV file?
FLV files are typically opened by software that natively supports the Flash Videoformat. If you don't have a compatible application, the most reliable approach is to convert the file to a more universal format using the converters listed above. Most Flash Video files convert to widely-supported alternatives in seconds.
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