Free online VIV to F4V converter

What the VIV format is

VIV is a legacy video format associated with VivoActive streaming software and the VivoActive Player. It was used for compressed internet video and older web multimedia, so it commonly appears in archived downloads, old websites, and recordings produced by VivoActive-era applications.

VIV is not the same format as modern MP4, and many current players do not include its decoder. File extension detection alone is unreliable; inspect the actual stream with ffprobe input.viv before converting it.

What the F4V format is

F4V is Adobe's ISO Base Media File Format variant for Flash Video. It normally contains H.264/AVC video and AAC audio, unlike the older FLV container's common support for Sorenson Spark and On2 VP6.

F4V was intended for Adobe Flash Media Server, Flash Player, and related publishing systems. It can provide better quality and compression than old FLV codecs, but Flash Player and most Flash delivery systems are now discontinued. Use F4V only when the receiving application specifically requires it; MP4 is generally the more compatible modern target.

How to actually convert VIV to F4V

The most practical desktop method is FFmpeg, provided that the installed build includes a VIV/Vivo decoder and an F4V-compatible muxer.

1. Install a current FFmpeg build and verify that the input is recognized with ffprobe input.viv. Look for detected video and audio streams rather than a message such as “Invalid data found.”
2. Convert and re-encode the streams with ffmpeg -i input.viv -c:v libx264 -preset medium -crf 20 -c:a aac -b:a 128k -movflags +faststart output.f4v.
3. If the output format is not detected from the extension, specify it explicitly: ffmpeg -i input.viv -c:v libx264 -c:a aac -f f4v output.f4v. Use this only if ffmpeg -formats lists an F4V muxer; some builds expose F4V through the MP4 muxer instead.
4. Check the result with ffprobe output.f4v, then test playback in the application that will consume the file. Confirm that the reported codecs are H.264 and AAC.

If FFmpeg cannot decode the VIV file, a converter cannot recover it by changing the extension. Try the original VivoActive Player or another application that still contains the Vivo decoder, export the recording to an intermediate AVI or MP4 file, and then run the FFmpeg conversion. This may require an older operating environment because VivoActive software is obsolete.

You can also convert the file on the 101convert.com website for free without installing software, subject to the site's supported input codecs and file-size limits.

Quality, compatibility, and limitations

Re-encoding is normally unavoidable because VIV's video codec is not suitable for direct placement in F4V. The -crf 20 setting is a quality target, not a fixed bitrate; use a lower value for larger, higher-quality files or a higher value for smaller files. If the source has no audio, remove -c:a aac -b:a 128k.

-movflags +faststart moves the F4V index toward the beginning of the file for progressive playback, but it does not make the file compatible with current browsers. F4V may also fail if the receiving system expects FLV rather than F4V, or requires a particular H.264 profile, level, frame rate, or audio sample rate.