How To Convert MP4 Video File into FLV Format Using FFMPEG

Question

I have to convert an MP4 Video File into FLV format using FFMPEG which I received from different mobile device. I found most of the stuff to convert flv video into mp4 and all.

Can any body help me out to convert mp4 format into flv using FFMPEG. I am using a Windows 7 64bit machine.

Pampuch

If i understand correctly you need to do this within an application right? What language are you programming in? If you only need to convert video, i recommend to use S.U.P.E.R. erightsoft.com/SUPER.html – Augean

And I suggest you to go ask this question on superuser.com since it's not programming related. – Apparel

@Augean Yes i want to convert video file using webservice. i am using vb.net2005. – Pampuch

@Apparel I want to convert video using vb.net and ffmpeg. – Pampuch

It's important to state that in the question. – Apparel

Answer 1

I'm late, but if this can help somebody, it's time well spent.

If I understand correctly, you want to convert MP4 to FLV using FFMPEG. Here are two command lines to help you do that; I'm currently using them myself (you can adjust them to your needs too) :

ffmpeg -i source.mp4 -c:v libx264 -crf 19 destinationfile.flv

and if the first one doesn't work :

ffmpeg -i source.mp4 -c:v libx264 -ar 22050 -crf 28 destinationfile.flv

Please note that -crf XX is the quality of the video you will create. It's between 0 and 51 (but between 17 and 23 is a reasonable range and the lower the number is, the better quality the video is going to be).

The -ar 22050 is for adjusting the audio sample range (audio quality). You can choose 11025, 22050 or 44100.

I suggest you read this Tutorial for FFMPEG . It's really complete and has many useful tips.

Hope this will help you or somebody in the same situation.

Selfservice

This is great and complete answer - it should be accepted - it definitely helped me as I was looking for exactly the same, to convert mp4 to flv using ffmpeg. – Tiebout

as a side note: i was ready to go with choco install ffmpeg - "Adobe Media Encoder" does not support FLV anymore, so this did it for me – Donation

i ended up with ffmpeg -i source.mp4 -strict experimental -vcodec "flv1" -qscale "4" -an converted.flv to have a Adobe Animate CC import compatible file with good quality and no sound (-an removes the sound, use -ar 22050 otherwise).. all done on windows. – Donation