How To Convert MP4 Video File into FLV Format Using FFMPEG

ffmpeg flv mp4

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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.

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Author by

nipul_tech

http://nipulparikh.wordpress.com/aboutme/

Updated on September 24, 2020

Comments

nipul_tech almost 4 years

i have to Convert 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 windows 7 64bit machine.
- Thomas over 12 years
  
  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
- karlphillip over 12 years
  
  And I suggest you to go ask this question on superuser.com since it's not programming related.
- nipul_tech over 12 years
  
  @Thomas Yes i want to convert video file using webservice. i am using vb.net2005.
- nipul_tech over 12 years
  
  @karlphillip I want to convert video using vb.net and ffmpeg.
- karlphillip over 12 years
  
  It's important to state that in the question.
Siniša over 9 years

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.
BananaAcid over 7 years

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
BananaAcid over 7 years

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.