How to convert FLV to MP4
- Add your .FLV file - drop it in the box above or click to browse.
- Convert it to .MP4 in a few seconds.
- Download your new .MP4 file.
What to expect
- If the FLV contains H.264 video and AAC audio, remuxing with
-c copyproduces zero quality loss - the streams are copied as-is into the new container. - Older FLVs using VP6 (
vp6f) or Sorenson H.263 (flv1) must be re-encoded to H.264, which is slightly lossy and takes longer than a remux. - Embedded Flash cue points and
onMetaDatascript tags inside FLV have no MP4 equivalent and are dropped, but normal video playback is unaffected.
Frequently asked questions
Can I convert FLV to MP4 without losing quality?
Yes, if the FLV uses H.264 + AAC - FFmpeg with
-c copy remuxes it losslessly in seconds. Quality loss only occurs when re-encoding older codecs like VP6.Why won't my FLV play on my phone or TV?
FLV was designed for Adobe Flash, which has been end-of-life since 2020 and is blocked in all modern browsers and devices. Converting to MP4 fixes playback everywhere.
How do I check which codec my FLV uses?
Run
ffmpeg -i yourfile.flv without an output file and read the video stream line - h264 means a lossless remux works; vp6f or flv1 means re-encoding is needed.How long does conversion take?
A remux with
-c copy finishes in seconds regardless of file size. Re-encoding to H.264 typically completes in under the video's runtime on a modern machine.Programs that convert FLV: Miro Video Converter · Adobe Premiere Pro · Aimersoft DRM Media Converter for Windows · Any DVD Converter · Any Video Converter FREE · AviDemux · DVD Ripper+Video Converter Ultimate · Free Studio
