[FFmpeg-user] theora question

[Rick C.]

On Apr 26, 2012, at 10:46 AM, Tom Sparks wrote:

> --- On Thu, 26/4/12, Rick C. <rickcorteza at gmail.com> wrote:
> 
>> From: Rick C. <rickcorteza at gmail.com>
>> Subject: Re: [FFmpeg-user] theora question
>> To: "FFmpeg user questions and RTFMs" <ffmpeg-user at ffmpeg.org>
>> Received: Thursday, 26 April, 2012, 10:49 AM
>> 
>> On Apr 25, 2012, at 1:50 PM, Carl Eugen Hoyos wrote:
>> 
>>> Rick C. <rickcorteza <at> gmail.com>
>> writes:
>>> 
>>>> On Apr 24, 2012, at 2:08 PM, Tom Sparks wrote:
>>>> 
>>>>> use the true ffmpeg2theora transcoder
>>> 
>>>> Actually I made a quick trial using this
>>>> and I didn't see a significant difference in speed?
>> 
>>> 
>>> Not very surprising given that ffmpeg2theora is using
>> libtheora 
>>> and FFmpeg.
>>> 
>>>> The same example I used previously which was
>> getting
>>>> only 40fps was about the same with ffmpeg2theora. 
>>> 
>>>> Quality was a bit better though. 
>>> 
>>> That is indeed surprising.
>>> 
>>>> In general does theora just not take advantage of
>> multithreading?
>>> 
>>> Are you sure theora is the right choice for encoding?
>>> There should be better and faster codecs for every use
>> case.
>>> 
>>> Carl Eugen
>>> 
>> 
>> 
>> Regarding the quality I didn't mean to say that ffmpeg
>> couldn't match the quality of ffmpeg2theora with the correct
>> settings,
> I dont think ffmpeg has the option for theora
>> just the settings that I used for my trials which
>> was only -qscale 10. 
> ffmpeg2theora dose not have a qscale
> 
>> I left ffmpeg2theora on the
>> default setting which I read was 6 if I'm not
>> mistaken.  Anyways, regardless of adjustments I had
>> roughly the same speed everytime that's what I meant when I
>> said I didn't see any significant changes.
> I think you can speed it up by using: -d 1
> but it can only be used with --videobitrate 
>> Yes this (theora) wouldn't be something I would want to use
>> everyday, I was just doing some testing and noticed that
>> it's quite slow no matter what I did and I came here to make
>> sure it wasn't something wrong I was doing. :-)  So
>> seems it's not me but the nature of the codec.  I
>> appreciate the help everyone.
> what are the other codec you comparing theora to?
>> 
>> rc
> tom
>> 


Well the few tests I ran were again MPEG-4.  I didn't make a very thorough set of tests I must say, but when I got 400 fps with MPEG-4 and 40 fps with theora a red flag went up regardless of quality. :-)