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When using ffmpeg to convert from .wmv files to .flv files, I find that either the quality is too low or the bps is too high. I am working on a Ubuntu Linux installation. Any suggestions?

The bps must be within 500k.

Command line line for high quality:

ffmpeg -i '$raw_video_path' -ab 64 -ar 44100 -b 300k -r 30 -s 720x480 -sameq $temp_flv

This produces a very high quality, but 10 times the allowed bps. Command line for low quality:

ffmpeg -i '$raw_video_path' -copyts -ar 44100 -s 320x240 $temp_flv

This produces too poor a quality with 90% of the the allowed bps.

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migrated from stackoverflow.com Oct 19 '09 at 16:56

This question came from our site for professional and enthusiast programmers.

You would get a better response to this question on superuser.com, as this question isn't programming-related. –  Andrzej Doyle Oct 19 '09 at 14:10

4 Answers 4

The flv format by itself is very low-quality. If you REALLY need to use flv you have to choose: either you stick with youtube-ish quality, or you pump up the bitrate, or, alternatively, you can preprocess the video. What does this mean? Well, to get a denoiser that takes out some of the frequencies, enhancing compressability and outputting a smooth image at the cost of CPU time. It works, and it works really well, plus depending on the content it may look even better. Remember, DCT blocks analyze frequencies, and when they can't reproduce high frequency they come up with crap.

I would use Avisynth's DCTFilter, But I don't know if it would work in Ubuntu. Very good speed and enhances compressability remarkably (It's more of a low-bitrate preprocessor than a denoiser, and the only drawback is when you have very sharp edges, like in anime)

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Last time I encoded video I used Winff. It lets you set some option. It may work for you. Basically it is a grafical interface for ffmpeg.

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We had the same problem here, and we ended up purchasing Sorenson Sqeeze. Not to mention we wanted to be x264 compatible, and squeeze could do all of that. The quality is fantastic. I highly recommend it.

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ffmpeg also supports grabbing and encoding in real time from a TV card.


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Please include the relevant parts of your answer here and don't point somewhere else. Also, your linked article doesn't even mention a specific solution. If you continue to plainly advertise your website like that without really helping the community here, this might result in actions being taken by a moderator. –  slhck Jul 16 '11 at 8:43

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