Why convert FLV to SWF?
An .flv holds a linear video and audio stream (H.263, VP6, or H.264 video; MP3 or AAC audio). An .swf is a compiled Flash application containing ActionScript code, vector graphics, and animation timelines - a Flash player used to load FLV files for playback, so the relationship ran that direction, not the reverse. No tool generates a SWF application from a video file, and even a valid SWF cannot play in any modern browser or device since Adobe Flash Player was discontinued.
How to convert FLV to SWF
FFmpeg OPEN-SOURCE
Remux an .flv with H.264/AAC to .mp4 using ffmpeg -i input.flv -c copy output.mp4; for older VP6 or H.263 files, omit -c copy to re-encode.
HandBrake FREE
Open the .flv in HandBrake, select an MP4 preset, and click Start Encode to produce a widely compatible .mp4 file.
VLC FREE
Go to Media > Convert/Save, add the .flv file, choose an MP4 profile, set the destination path, and click Start.
Programs that convert FLV
About these formats
.FLV
Flash Video
An FLV (Flash Video) file is a video made for Adobe Flash Player, the format YouTube and most streaming sites used through the 2000s. Flash is dead since December 2020, but VLC media player…
Open .FLV details →
.SWF
Small Web Format (Shockwave Flash)
An SWF file is a compiled Adobe Flash animation, game, or interactive movie (Small Web Format). Adobe Flash Player reached end-of-life on 31 December 2020 and now actively blocks all Flash…
Open .SWF details →Quality & what to watch
- Adobe Flash Player reached end-of-life on 31 December 2020 and is blocked in all major browsers - even a valid
.swffile is a dead end on modern systems. - For
.flvfiles from around 2010 onward with H.264 video and AAC audio, FFmpeg can remux to.mp4in seconds with no quality loss. - Older
.flvfiles with VP6 or H.263 video require a re-encode to produce an MP4; HandBrake handles these with a simple preset.
