How to convert flv to avi using ffmpeg high quality

Question

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.

Solution 1

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

Solution 2

This is a Good solutions

ffmpeg -async 1 -i inputVideo.flv -f avi -b 700k -qscale 0 -ab 160k -ar 44100 outputVideo.avi

Or Used following one

ffmpeg -loglevel 0 -async 1 -i inputVideo.flv -f avi -b 700k -sameq -ab 160k -ar 44100 outputVideo.avi

Solution 3

There is also another solution found on the internet and works like charm!

Just use same quality parameter -sameq.

ffmpeg.exe -i video.flv -sameq outputVideo.avi

Actually the command sameq is not same quality. In order to successfully do it this one must be applied: in case you have multiple files to do here is the complete command

for %i in (*.flv) do ffmpeg -i "%i" -q:a 0 -q:v 0 "%i".avi

Solution 4

To preserve quality use -qscale 0.

For example ffmpeg.exe -i InputVid.avi -qscale 0 OutputVid.mp4

I converted my 1.64 GB avi video to 4.35 MB mp4 file.

View more solutions

Comments

[CaptainProg]

This does NOT mean 'same quality': ffmpeg.org/trac/ffmpeg/wiki/…

[Optimus Prime]

it tells me -b is ambiguous. Use -b:v or -b:a instead. What's this?

[Qantas 94 Heavy]

@OptimusPrime: that's the video/audio bitrate respectively (if anyone else was also confused).

[Ash]

+1, the first command above is the only one that worked for me, others either had "invalid parameters" or seg faulted.

[samnaction]

But the file size is so high. Anyway to reduce the file size without compramising quality. My video file mostly contains texts

[Luca Davanzo]

this is THE solution! ,)

[Tenaciousd93]

+1 thanks to your second solution that I updated in ffmpeg -i input.flv -async 1 -f avi -b 700k -qscale 0 -ab 160k -ar 44100 outputVideo.avi. I convert a 100 mins flv video of 270mb to 1.5 GB avi file with the same quality. :)

[SYK]

Also works for me for avconv -async 1 -i in.mp4 -vf "transpose=1" -f avi -b 700k -qscale 0 -ab 160k -ar 44100 out2.avi

[Iulian Onofrei]

"Option 'sameq' was removed. If you are looking for an option to preserve the quality (which is not what -sameq was for), use -qscale 0 or an equivalent quality factor option."

[llogan]

-qscale is ignored by libx264 which, if available, is the default encoder for MP4 output. Use -crf instead if using this encoder. Since it is ignored I'll assume the default of -crf 23 was applied in your case.

[Alec Istomin]

-q:a 0 -q:v 0 is the answer in 2020