[MPlayer-dev-eng] Make ffmpeg MPEG1/2 decoder the default?

[Loren Merritt]

On Wed, 20 Feb 2008, Ivan Kalvachev wrote:
> On Feb 19, 2008 9:54 PM, RC <cooleyr at gmail.com> wrote:
>> On Tue, 19 Feb 2008 00:29:52 -0700 (MST)
>> Loren Merritt <lorenm at u.washington.edu> wrote:
>>
>>> Theoretically shouldn't be any worse than a idct mismatch, which is
>>> almost  always the case in mpeg1/2 because we have no idea what idct
>>> the dvd  encoder used.
>>
>> "-vc ffmpeg12 -lavdopts fast" looks HORRIBLE playing back the (otherwise
>> perfect, 5Mbps, interlaced, MPEG-2) videos created by my Hauppauge WinTV
>> PVR-250.
>>
>> Short 10MB sample in /incoming:  WinTVPVR250.mpg
>
> I have the feeling Loren was talking about h264.

I was talking about mpeg2. I even said so in the above quote.
I guess none of my dvds used cqm.

> As for ffmpeg12 and fast it is known that the fast quantizer skips the
> custom quantization weight matrixes, that could produce a lot uglier
> output.
>
> There are kind of 2 solutions. One of them is to keep track of the
> custom matrixes  and disable/enable fast if they are/not/  standard.

The other solution is to instantiate cqm and non-cqm versions of both the 
fast and the compliant dequant function.

--Loren Merritt