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.

score 30 · Answer 1 · answered Sep 05 '11 at 05:44

30

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

answered Sep 05 '11 at 05:44

laurent

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it tells me `-b` is ambiguous. Use `-b:v` or `-b:a` instead. What's this? – Optimus Prime Jul 19 '13 at 07:00
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@OptimusPrime: that's the video/audio bitrate respectively (if anyone else was also confused). – Qantas 94 Heavy Sep 23 '13 at 13:40
But the file size is so high. Anyway to reduce the file size without compramising quality. My video file mostly contains texts – samnaction May 15 '14 at 12:22

score 16 · Answer 2 · answered Jan 17 '13 at 09:11

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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

answered Jan 17 '13 at 09:11

Elby

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+1, the first command above is the only one that worked for me, others either had "invalid parameters" or seg faulted. – Ash Oct 26 '13 at 02:40
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this is THE solution! ,) – Luca Davanzo May 28 '14 at 12:38
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+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. :) – Tenaciousd93 Jan 28 '15 at 20:21
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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 – SYK Apr 16 '15 at 20:57

score 9 · Answer 3 · edited Apr 02 '14 at 02:41

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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

edited Apr 02 '14 at 02:41

Community

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answered Oct 01 '12 at 12:26

Semertzidis Aris

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This does NOT mean 'same quality': http://ffmpeg.org/trac/ffmpeg/wiki/Option%20%27-sameq%27%20does%20NOT%20mean%20%27same%20quality%27 – CaptainProg Oct 11 '12 at 12:00
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"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." – Iulian Onofrei May 07 '15 at 19:18
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`-q:a 0 -q:v 0` is the answer in 2020 – Alec Istomin Mar 13 '20 at 17:40

score 5 · Answer 4 · answered Oct 26 '17 at 06:40

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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.

answered Oct 26 '17 at 06:40

Saad Anees

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`-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. – llogan Oct 26 '17 at 18:54

How to convert flv to avi using ffmpeg high quality

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