Re: ogg to mpeg

Phil Ehrens wrote:
> Phil Ehrens wrote:
>> Carl Karsten wrote:
>>> Phil Ehrens wrote:
>>>
>>>> I'm not suggesting that the crap programs available for Windows and Mac
>>>> are worth 2 cents, but Linux video software is in a pretty messy state
>>>> overall. Still no decent editor, and no decent subtitling program.
>>>> Transcode can make dvd's that totally blow away even the best commercial
>>>> dvd's, by the way... But I don't know why. Unless all the "pros" are
>>>> total idiots.
>>> In what way is the tc produced dvd better?
>> Use of available bits. I just made a dvd with an *average* bitrate
>> of 2.8, and a peak of 13. The source was a beautiful h.264 hdtv
>> capture. By balancing the use of the nr filter in ffmpeg with the
>> msharpen filter of transcode, I achieved a dvd that preserves
>> fine detail amazingly well, loses a little low contrast edge detail
>> in dark scenes, and has nearly zero mosquito noise. It's a two
>> pass encode, and it has hard-coded fancy styled subtitles rendered
>> by mplayer.
>>
>> The peak bitrate is outside the standard, but it is only transient,
>> so any player not made more than five years ago handles it without
>> a buffer problem, since the average bitrate is so low. I've found
>> that buffering problems start to occur at about 18 mbit transients
>> with modern players. If the peak bitrate were hard limited to
>> conform to the standard, it would yield some macroblocking in high
>> motion scenes (there are panning shots with sword fights). I am
>> particularly interested in the fabrics used in the costumes, and
>> it is easy to differentiate between silk, cotton, and bast fibers
>> on this dvd ;^)
>>
>> I have some dvd's that have an average bitrate of 1.8 with very
>> static content that look about the same as a typical commercial
>> dvd (with a bitrate of 4-6). Those have peaks below 8.
> 
> Gah! Foolish me... I left out the most important difference... I
> forget about this because to me it just seems natural to do it...
> 
> Since I compensate for overscan, my dvd's show 15% more of the
> picture than commercial dvd's, AND the bitrate is effectively
> 15% higher because I don't waste bits on that part of the picture
> that would otherwise be lost to overscan. By the way, my peak
> bitrate overstep is only a deviation from the dvd standard, the
> mpeg2 standard allows it... Mpeg2 decoding chips are designed to
> the mpeg2 standard, afaik.

you mean that isn't my TV's fault? :)

wow, I wonder why the DVD industry isn't on top of this stuff.  Seems like it 
would be good biz... wait.  Dilbert's boss is everywhere.

Carl K