[XviD-devel] Questions / Bug fixes / Patches

[Michael Militzer]

Hi Carl,

as said, the N_VOPs at frame_drop_ratio=0 are not frames that got actively
dropped (to reduce framerate or save bits). The N_VOPs are just written to
the bitstream because they are more efficient than P_VOPs with all MBs set
to skip mode.

When N_VOPs occur for frame_drop_ratio=0 then because two or more input
frames are basically identical. And using a N_VOP in such a case is not
against the semantics of the frame_drop_ratio feature I'd say. Hence,
let's leave this unchanged.

Your other proposed changes (new levels for VfW) have been applied to
the 1.3-dev tree of xvid. Thanks.

Best regards,
Michael


Quoting Carl Eric Codere <cecodere at yahoo.ca>:

> Greetings there!
>                Well actually, you are correct, I am really sorry to   
> have made you waste time with this. After further verification, the   
> nodrop option produces correct video output with a constant bitrate.
>
> Nonetheless, I think the frame_drop_ratio=0 might still be useful,   
> what do you think, was it the original syntax goal? Otherwise, just   
> remove that part of my patch...
>
> Thanks for all your help!
> Best regards,
> Carl
>
> --- On Thu, 8/19/10, Michael Militzer <michael at xvid.org> wrote:
>
>> From: Michael Militzer <michael at xvid.org>
>> Subject: Re: [XviD-devel] Questions / Bug fixes / Patches
>> To: xvid-devel at xvid.org
>> Received: Thursday, August 19, 2010, 5:49 PM
>> Hi,
>>
>> I'm still not sure that there is a problem with MP4Box at
>> all. When I look
>> at the console output that you posted using the "-nodrop"
>> option things
>> appear to be fine actually: There's no message about
>> variable framerate
>> and all input frames seem to have been imported (at least
>> it's exactly 28
>> frames more imported than without "-nodrop"). It looks like
>> MP4Box is
>> simply converting the N_VOPs to P_VOPs and this is
>> indicated by the
>> "Removed 28 N-VOPs" message.
>>
>> So: Are you sure that the resulting .mp4 file from the
>> "MP4Box -nodrop"
>> command really is variable framerate and that not all input
>> frames got
>> imported?
>>
>> Regards,
>> Michael
>
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