AVI also a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows technology. AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback.

FLV is a container format developed by Adobe systems which used to deliver video over the Internet using Adobe Flash Player versions 6–11. Flash Video content may also be embedded within SWF files. Flash Video is currently the defacto standard for online video.

1. AVI format is developed by Microsoft for playing on Windows platform and FLV developed by Adobe for online video.
2. AVI format files give easy access to the visitors for viewing the website content than FLV.
3. Saving your file to either FLV or AVI would result in the same video if you use the same codec.
4. FLV is native format to Adobe Flash (Not used for any other software).

Other Comparison: MOV vs WMV / 3GP vs 3G2 / MP4 vs FLV / MKV vs MP4 / MP4 vs MP3 / 3GP vs MOV / 3GP vs FLV / M2TS vs MP4

Related Post of AVI File formats

Related Post of FLV File formats