FLV vs F4V

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.

F4V is a Flash video format based on based on the ISO base media file format and supported in Adobe Flash Player and currently developed by Adobe Systems. F4V file extension specified by ISO/IEC 14496-12 as a base media file format.

Summary:
1. Different media types in FLV and F4V
FLV (video: On2 VP6, Sorenson Spark (Sorenson H.263), Screen video, H.264
audio: MP3, ADPCM, Linear PCM, Nellymoser, Speex, AAC, G.711 (reserved for internal use))
F4V (Video: H.264
Audio: AAC, HE-AAC, MP3
Image: GIF, PNG, JPEG)
2. F4V  is starting with Flash Player 9 update 3
3. F4V does not support Screen video, Sorenson Spark, VP6 video compression formats and ADPCM, Nellymoser audio compression formats.

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

Related Post of FLV File formats