Compare
FLV vs MP4
FLV is mainly encountered in legacy Flash Video files, while MP4 is a widely used container for current video delivery. A migration decision should account for the codecs inside the file, not only its extension.
Which format should you choose?
Preserve and inspect existing FLV assets; for new delivery, consider an MP4 configuration tested with the target players and devices.
Good fit for FLV
Legacy video migration
- Inspecting and migrating a surviving Flash-era video archive
Good fit for MP4
Web video distribution
- Publishing a video encoded to the target browser's supported profile
Basic information
| Field | FLV | MP4 |
|---|---|---|
| Extension | .flv | .mp4 |
| MIME type | video/x-flv | video/mp4 |
| Common uses | Legacy video migration | Web video distribution |
| How to open | Open with an FLV-capable player or converter and inspect the codec if playback fails. | Open with a compatible player or browser; if it fails, inspect actual video and audio codecs. |
| Export or convert | For new distribution, convert to a supported MP4 or WebM profile and verify picture, sound, and subtitles. | For another container or codec, check whether re-encoding occurs; retain the editing master and verify resolution, frame rate, and audio. |
Choose by use case
Inspecting and migrating a surviving Flash-era video archive
Legacy video migration
FLVPublishing a video encoded to the target browser's supported profile
Web video distribution
MP4Key point 1
FLV is associated with legacy Flash-based video workflows.
More on the differencesKey point 2
MP4 is widely used, but playback still depends on its video and audio codecs.
More on the differencesMore on the differences
Keep the original, inspect its streams, and test a representative conversion for picture, sound, captions, and timing. Confirm target-device support before replacing archived or published files.
- FLV is primarily a legacy interchange or playback format today.
- MP4 is commonly used for web and device distribution with compatible codecs.
- Container conversion or re-encoding can affect quality, metadata, and subtitles.
Frequently asked questions
Is every MP4 playable on every device?
No. Codec, profile, resolution, and device support still matter.