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Converting a video to FLV.

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Andre Augustson
Converting a video to FLV.
on Mar 19, 2011 at 2:26:15 pm


I'm in desperate need for a good program which converts a video file to FLV so that I can upload it to Youtube. I want to convert it to FLV because of the smaller file size. I was using Free Video to Flash Converter ( but it doesn't work anymore. The output file is just empty when I convert. I have tried other programs but the quality sucks after the conversion. I need a good program who maintains a really good quality.

Thanks for any help!

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Craig Seeman
Re: Converting a video to FLV.
on Mar 19, 2011 at 6:28:21 pm

Sorry but you're way wrong. Data rate determines file size, not codec. At a given data rate codec can be a significant factor on quality. H.264 is more efficient than flv at low data rates. Given the very large sized YouTube accepts even size isn't too relevant. A large H.264 file is best since they're going to re-compress it.

It seems you don't know what flv is either. FLV is a container/wrapper/extension which often contained Sorenson Spark (or equivalent) years back and now commonly contains On2VP6. They were both used in Flash.

These days many H.264 and containers for it work in Flash. That includes mov, mp4, m4v, f4v and others.

On August 20, 2007, Adobe announced on its blog that with Update 3 of Flash Player 9, Flash Video will also support some parts of the MPEG-4 international standards. Specifically, Flash Player will have support for video compressed in H.264 (MPEG-4 Part 10), audio compressed using AAC (MPEG-4 Part 3), the F4V, MP4 (MPEG-4 Part 14), M4V, M4A, 3GP and MOV multimedia container formats, 3GPP Timed Text specification (MPEG-4 Part 17) which is a standardized subtitle format and partial parsing support for the 'ilst' atom which is the ID3 equivalent iTunes uses to store metadata. MPEG-4 Part 2 and H.263 will not be supported in F4V file format. Adobe also announced that it will be gradually moving away from the FLV format to the standard ISO base media file format (MPEG-4 Part 12) owing to functional limits with the FLV structure when streaming H.264.

And if you actually check YouTube's help.
2GB size limit.
Many acceptable codecs and containers.

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Jeff Greenberg
Re: Converting a video to FLV.
on Mar 20, 2011 at 3:56:22 pm


Saying "FLV" is like saying I want a bottle of alcohol. Which sized bottle? Which type of alcohol?
You're describing the bottle (generically) rather than saying what goes in it.

Here's a free flash converter:

That doesn't mean you'll get the best quality output - merely that it works.

What format are you starting with? From what editorial tool?

If you're just going to youtube - you might be thrilled to know that they will let you upload much larger files (takes much longer), but they have pretty decent encoders on their end.
Take a look here

That's good up to 2 gb. Plus they have a tool for much larger video:

But what I think you want is a tool on your end that will build a decent looking h.264 file
After all thats, what youtube recommends

Youtube uses the command line version of FFMPEG
There are a number of free GUI based (rather than command line) tools;
I think you're on windows - here's one:
Don't ask me anything about it - I just know it's free.


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Brad Elliott
Re: Converting a video to FLV.
on Mar 21, 2011 at 8:52:02 pm

Adobe CS3,4,5 has an excellent media encoder for what you need.

If you do not have it this would be probably be more than you want to spend but in my experience this has created the best looking flv files vs other free or less expensive options. This is especially true when I have to meet certain size and data rate specs.

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