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Tools Required: (Portable & Stealth) AvantiPortableYouTubeHDPortable (if new version is released, simply re-run installer to update)FLVExtractPortable (requires .NET framework)YAMBPortable (contains latest MP4box, eac3to, and tagger.)Note: the applications above were all designed by me using PortableApps.comFormat.. so i can personally vouch for safety. Optional: (Portable & Stealth) YTDPortable (provides fast, multiple simultaneous downloads)Pazera Video Converters Suite 1.8 (this is also a very good, free, video/audio converter.. a bit large in size though.)Note: all applications listed above are portable & stealth. (leaves no trash behind after usage.) Synopsis: i download YouTube videos alot.. mainly documentaries which i convert losslessly to audio for listening at night night which helps me go to sleep :) 1. Download desired YouTube video. 2. Start YAMBPortable. 3. Load video. 4. Extract raw formats losslessly. (.aac is natively supported by Windows.. if you don't care about size.. you can use .aac for listening.) (for those concerned about conserving HD space.. continue with tutorial for converting to MP3) 5. Start AvantiPortable. 6. Converting raw audio stream to desired format w/AvantiPortable. 7. How to deal with .FLV formats using FLVExtractPortable. 8. FLVExtractPortable in action. 9. How to convert .FLV to .MP4 losslessly with YAMBPortable. 10. How to load raw streams into YAMBPortable. 11. Finished product.. .MP4 file which we losslessly converted from .FLV :) Note: YAMB is a versatile, light-weight application capable of many conversions, muxing, demuxing, and other useful features not shown here. I highly recommend adding YAMB to your video toolbox. YAMB is quirky, and just a GUI which hasn't been updated in a while, and is known to throw random, harmless errors.. just ignore them.. everything will work fine :)