[FFmpeg-user] theora question

[Rick C.]

On Apr 27, 2012, at 12:31 PM, Tom Sparks wrote:

> --- On Fri, 27/4/12, 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: Friday, 27 April, 2012, 11:46 AM
>> 
>> 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. :-)
> witch mpeg-4?
> mpeg-4 part 2 (XVID, DVIX,etc) or mpeg-4 part 10 (H.264)
>> 
> tom sparks


Sorry part 2 for DivX...