FLV to AVI Converter

FLV to AVI Converter

This tool accepts FLV files, the container of the Flash era, normally carrying H.264 although very old files may carry Sorenson or VP6. AVI is a very old container. It has nowhere to record several things that modern formats treat as given: variable frame rate, chapters, layered subtitles. Choose it when you have to work with an old program or device that accepts AVI only. These two containers hold two different families of codecs, so the streams cannot be copied. All the video and audio has to be decoded and then encoded again with the codec of the target format — and that step adds a layer of loss.

How to convert FLV to AVI

1. Select or drag FLV files into the upload area.
2. Confirm that the requested output format is AVI.
3. Start the conversion and review the status of each file.
4. Download each result once processing has finished.

Convert several files in one batch

The interface currently accepts up to 10 files per batch. Files are processed one after another; duplicates, mislabeled files and damaged files may be skipped or reported as errors.

File size after conversion

The size is decided by the output settings and not by the size of the source. The result can come out smaller or larger than the source while still being lower in quality. AVI carries more bookkeeping than newer containers, and the codecs usually paired with it compress less efficiently, so the result often comes out larger than the source.

Check the result

Watch a fast-moving passage and a dark passage — compression marks show up there first — then check that sound stays in step with picture right to the end. FLV files usually have a low resolution by present-day standards. The result cannot be sharper than the source, so do not enlarge it and expect more clarity.

Limits worth knowing

This tool changes the file format. It does not guarantee that every piece of metadata, every format-specific property or every embedded object survives the conversion. Keep the source file and test the result in the application where you plan to use it.

Frequently asked questions

Why is the AVI larger

Because the container keeps more bookkeeping, and the older codecs normally used with AVI compress worse than H.264 at the same quality.

Can AVI hold H.264

In theory yes, but real support is poor and the picture often breaks. This tool re-encodes so the file genuinely plays rather than only playing on paper.

Can my old FLV file be converted

Yes, but if Sorenson or VP6 is inside it, re-encoding happens even when the target belongs to the same family as FLV.

Why does this conversion take so long

Because every frame has to be decoded and encoded again. The time is proportional to the length of the footage, not to the size of the file.

Is there a way to convert without losing quality

Not between these two families of codecs. Avoiding loss means choosing a target format that belongs to the same codec family as the source.

Is my original file replaced?

No. The file on your device is left untouched.