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John Cuttis | 22 Apr 21:48
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Encoding speed

I tried to encode two minutes from an AVI DV file 720x480:

ffmpeg latest release produces a FLV 320x240 25fps 360k video 40k audio in about 45 sec.

ffmpeg latest release produces an OGG 320x240 25fps 360k video 40k audio in about 1:20 sec.

ffmpeg2theora the same in about 2 minutes or more.

The FLV quality it's quite good, some dropped frames maybe.
I was wondering to know if ffmpeg team it's using a "special" theora lib version :-)
ok, right question to ask ffmpeg team but, maybe someone have a clue about this.

thanks in advance

JohnC

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Hannes Hauswedell | 16 May 17:25

Re: Encoding speed

Theora-encoding is just that slow, I think...

Am Dienstag 22 April 2008 19:49:13 schrieb John Cuttis:
> I tried to encode two minutes from an AVI DV file 720x480:
>
> ffmpeg latest release produces a FLV 320x240 25fps 360k video 40k
> audio in about 45 sec.
>
> ffmpeg latest release produces an OGG 320x240 25fps 360k video 40k
> audio in about 1:20 sec.
>
> ffmpeg2theora the same in about 2 minutes or more.
>
> The FLV quality it's quite good, some dropped frames maybe.
> I was wondering to know if ffmpeg team it's using a "special" theora
> lib version :-) ok, right question to ask ffmpeg team but, maybe
> someone have a clue about this.
>
> thanks in advance
>
> JohnC
>
>
>      
> _____________________________________________________________________
>_______________ Be a better friend, newshound, and
> know-it-all with Yahoo! Mobile.  Try it now. 
> http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
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xiphmont | 16 May 16:45
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Re: Encoding speed

On Fri, May 16, 2008 at 11:25 AM, Hannes Hauswedell
<theora.list <at> soulrebel.in-berlin.de> wrote:
> Theora-encoding is just that slow, I think...

I think he was referring to the wide difference in the two encoders
with the same input.

Monty
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John Cuttis | 16 May 17:32
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Re: Encoding speed

On Fri, May 16, 2008 at 11:25 AM, Hannes Hauswedell
<theora.list <at> soulrebel.in-berlin.de> wrote:
> Theora-encoding is just that slow, I think...

>I think he was referring to the wide difference in the two encoders
>with the same input.

>Monty

Monty you are correct, ffmpeg produces FLV very quickly and I have done a visual diff sx theora dx flv and I have noted that flv has less frame during camera motion but, globally, it's quite comparable with Theora even more crisp; more FLV is produced in  30-40% less time than theora using always ffmpeg. (internal theora codec)

ffmpeg2theora instead uses more time to do the same.

So two order of doubt about latest ffmpeg release
1) why ffmpeg->FLV encoding is so quickly compared to ffmpeg->theora
2) why ffmpeg->theora is quite quikcly compared to ffmpeg2theora from J.

I think this is not a poor question as time encoding is more than 5-10%

do you have a clue ?

thanks

JC



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