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ffmpeg setting keyframes

Wed, 20 Aug 2008 22:44:06 EST

At work, we routinely use ffmpeg for conversion of various video formats into flv. Recently, one of the things we wanted to do was manually set the keyframes. If you search for the command line switch that is used to set keyframes, then you will get a lot of odd results that won't work.

After a little research, it turns out that ffmpeg refers to keyframes as GOP or group of pictures. You can set the keyframe encoding rate simply by using the command line switch -g. So in order to convert an uncompressed .mov file into a flv of the same quality with a keyframe at every frame, I used the following command:

ffmpeg -i UncompressedMov.mov -sameq -g 1 OutputFile.flv

I hope that saves someone a half hour of searching!

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Charles Palen has been involved in the technology sector for several years. His formal education focused on Enterprise Database Administration. He currently works as the principal software architect and manager at Transcending Digital where he can be hired for your next contract project. Charles is a full stack developer who has been on the front lines of small business and enterprise for over 10 years. Charles current expertise covers the areas of .NET, Java, PHP, Node.js, Javascript, HTML, and CSS. Charles created Technogumbo in 2008 as a way to share lessons learned while making original products.

Comments

Drumkruk

April 16, 2013 11:33 am

Thank you very much! This is exactly what we needed to fix a major bug in our system!

A guest

March 15, 2013 02:35 am

-sameq does not mean 'same quality', it means 'same quantizers'
http://ffmpeg.org/trac/ffmpeg/wiki/Option%20%27-sameq%27%20does%20NOT%20mean%20%27same%20quality%27

webdiyer

January 14, 2013 04:29 am

File will be very large!

Ryo saeba

March 22, 2012 2:13 pm

Save my end of day, first in google! Thank you!

ocvadmin

December 20, 2011 2:57 pm

That was helpful. We are about to change that and check. Found this in 1 minute and could save 29 like you said.

Johan-Belgium

December 6, 2011 08:08 am

Yep! Saved me some googling time too! Thanks!

October 21, 2011 11:40 am

still saving people time 3 years later! tks!

tartartar

September 22, 2011 09:47 am

Yes, thank you! Saved me hours.

Guest

May 8, 2011 07:28 am

thankyou!

Done

January 18, 2011 6:19 pm

Thanks a bunch!

Sam

August 12, 2010 03:07 am

Thank you very much!

elad

February 14, 2010 05:16 am

THANKS :)

kirk

January 3, 2010 04:50 am

thanks ) now my ffm problem is solved in case anyone else came across the same problem the 'ffm' file *should* start with a keyframe!

Mike

December 15, 2009 1:23 pm

Many thanks. First page I searched. DONE!

alex

December 3, 2009 03:56 am

great, thanks for your time!!

Rosen

November 2, 2009 10:50 am

Thanks !

Tom

October 22, 2009 12:17 am

Saved me half an hour. Cheers!

August 11, 2009 05:33 am

Thanks!

Charles

July 22, 2009 2:27 pm

Your welcome everyone. Who would have ever thought it would be called "Group of Pictures"...right? I have worked with video editing for several years and never heard that term.

phil

July 22, 2009 2:09 pm

save a lot of time to me too, thanks

Jim J

June 23, 2009 5:07 pm

Saved me time too

taksistaZR

June 9, 2009 3:48 pm

Thank you, it saved me time

gorefest

May 26, 2009 1:54 pm

Great hint! Lotsa thanks!

huck fin

May 24, 2009 2:57 pm

Wow, Thanks for posting this. I would have never thought it was so simple (and undocumented). I have been trying this for days.

April 26, 2009 05:11 am

Yes it saved me time.. first result on google :D thanks

bad kittie

March 1, 2009 09:03 am

yep, same here, thank you! :)

Guest

January 25, 2009 00:56 am

Thank you! I've been searching for "keyframe" info for at least half an hour. Definitely saved me time.

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ffmpeg setting keyframes

Wed, 20 Aug 2008 22:44:06 EST

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