[theora] Loseless Video Codec

[Stefan Gürtler]

Stefan Gürtler schrieb:
> Philip Jägenstedt schrieb:
>> On Fri, Jan 8, 2010 at 09:23, dos386 <dos386 at gmail.com> wrote:
>>>> P.S. Opera 10.5 just added support for Ogg *thumbs up*
>>> http://my.opera.com/ODIN/blog/opera-10-5-pre-alpha-build-released-here-is-whats-new
>>>
>>>> Will Opera 10.50 include support for playing Ogg Theora video using the HTML5 video tag?
>>>> @Petter: Yes, we're working to include it in future builds.
>>> I can't find ^^^ such info :-|
>> http://my.opera.com/core/blog/2009/12/31/re-introducing-video
>>
>>>>> Could you elaborate on this?  Standard MJPEG is necessarily lossy.
>>>> Judging by the size and image quality
>>>> it actually __is__ __lossless__ too (the bitrate setting as no effect). I'm
>>>> sure ljpeg can be done with mencoder etc too.
>>> It would be maybe good to make sure that the competitor __IS__
>>> lossless by comparing the frame bitmaps.
>> The video has already been captured, so there's no helping my data if
>> ffenc_ljpeg isn't lossless (which would be a bit surprising, but
>> possible). But in any case, I have really wanted a tool to verify that
>> two videos are in fact pixel-identical and perhaps to show visual
>> diffs. Does anyone know of such a tool?
> 
> How to ensure that two clips have identical information: Decode each 
> frame to uncompressed pictures and calculate a md5sum. MPlayer has a 
> video output driver, which calculates the md5 sums of the frams.
> See mplayer -vo help
> 
> For showing the differnce between two clips i would suggest to look into 
> the avisynth frame server, e.g 
> http://avisynth.org/oldwiki/index.php?page=Compare

This one should be even better to spot any differences:
http://avisynth.org/mediawiki/Subtract

Using linux as OS -> try avs2yuv

Stefan

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