[MPlayer-users] Lossless h264 Encoding

[Fluxid]

Anyway, is mencoder (x264) capable of encoding completely lossless h.264 video? As far i remember, x264 only encodes in 4:2:0 chroma format, so chroma is subsampled (pixelized)...

Dnia 17-10-2007 o 15:42:47 Ognjen Bezanov <Ognjen at mailshack.com> napisał:

> Guillaume POIRIER wrote:
>> Hi,
>>
>> On 10/17/07, Ognjen Bezanov <Ognjen at mailshack.com> wrote:
<snip>
>>
>> Yes, but apparently you didn't even care to read curren't manpage
>>
>>        qp=<0-51>
>>               This selects the quantizer to use for P-frames.  I- and B-frames
>>               are offset from this value by ip_factor and  pb_factor,  respec-
>>               tively.  20-40 is a useful range.  Lower values result in better
>>               fidelity, but higher bitrates.  0 is lossless.  Note that  quan-
>>               tization  in  H.264  works  differently from MPEG-1/2/4: H.264's
>>               quantization parameter (QP) is on a logarithmic scale.  The map-
>>               ping  is  approximately H264QP = 12 + 6*log2(MPEGQP).  For exam-
>>               ple, MPEG at QP=2 is equivalent to H.264 at QP=18.
>>
>>
>> :-(
>>
>>
<snip>
>>
>> -x264encopts qp=0
>>
>> Guillaume
>
> oh. I feel stupid now :(
>
> I read the manpage before, but I forgot that I had upgraded mplayer
> since then. Sorry for the time wasting :(
>
> Ogi.
>
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