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How to convert YouTube videos using freeware converters
To convert .FLV videos the following PC software can be used:

• MediaCoder (Freeware/Windows)
• Riva FLV Encoder (Freeware/Windows) - batch conversion can be done only if you own Riva Producer or Riva Producer Lite. What else can you expect from a free converter?
• SUPER (Freeware/Windows)

How to convert .flv video files to play on PSP using freeware video to PSP converters

• PSP Video 9 (Freeware/Windows) - allows you to convert most formats (including .flv) to play on PSP.
• DVDVideoSoft YouTube to iPod and PSP Converter (Freeware/Windows)
• MediaCoder (Freeware/Windows)
• SUPER (Freeware/Windows).

How to convert .flv files to play on iPod using freeware video to iPod converters

• Videora Converter (Freeware/Windows) - allows you to convert most formats (including .flv) to play on iPod.
• DVDVideoSoft YouTube to iPod and PSP Converter (Freeware/Windows)
• MediaCoder (Freeware/Windows)
• SUPER (Freeware/Windows).

How to convert YouTube videos to MP3 using freeware software
Since most FLV video files use MP3 audio, the best choice is to extract it and avoid recompression.

• FLV Extract (Freeware/Windows)
• Avidemux (Freeware/Windows)

Related threads:

• Converting .FLV videos
• Record/Capture/Download flash videos from YouTube

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How to convert flash .FLV videos to DivX, Xvid,... using freeware AviSynth and VirtualDub (Windows):

• Get an FLV Splitter, install ffdshow and enable the FLV1 decoder (I use K-Lite codec pack).
• Install AVISynth.
• Use VirtualDub or your AVI encoder of choice.