Linux – How to convert flv to avi using ffmpeg high quality

ffmpegflashflash-videolinuxvideo

Need to convert flv files to avi or mov, trying out ffmpeg but the output quality is terrible. How can I get the video output to be on par quality with the source?

I thought ffmpeg -i name.flv -s 320x… name.avi would do it, but no good.

Best Answer

That's the command I was using for a ffmpeg project, the quality should be good enough. If not, try increasing the bitrate (-b argument):

ffmpeg -i input.flv -ar 22050 -b 2048k output.avi

Related Solutions

Flash CS4 refuses to let go

Flash still has the ASO file, which is the compiled byte code for your classes. On Windows, you can see the ASO files here:

C:\Documents and Settings\username\Local Settings\Application Data\Adobe\Flash CS4\en\Configuration\Classes\aso

On a Mac, the directory structure is similar in /Users/username/Library/Application Support/

You can remove those files by hand, or in Flash you can select Control->Delete ASO files to remove them.

Rotating videos with FFmpeg

Rotate 90 clockwise:

ffmpeg -i in.mov -vf "transpose=1" out.mov

For the transpose parameter you can pass:

0 = 90CounterCLockwise and Vertical Flip (default)
1 = 90Clockwise
2 = 90CounterClockwise
3 = 90Clockwise and Vertical Flip

Use -vf "transpose=2,transpose=2" for 180 degrees.

Make sure you use a recent ffmpeg version from here (a static build will work fine).

Note that this will re-encode the audio and video parts. You can usually copy the audio without touching it, by using -c:a copy. To change the video quality, set the bitrate (for example with -b:v 1M) or have a look at the H.264 encoding guide if you want VBR options.

A solution is also to use this convenience script.

Best Answer

Related Solutions

Flash CS4 refuses to let go

Rotating videos with FFmpeg

Related Topic