[Xvid-devel] XVID encoding image with "run/ghost" distortions

Thu Jun 12 15:10:22 CEST 2014

After encoding, I´m seeing pixels that getting left behind when 3D 
animations occur in the frame, especially on object with solid colors.

Images that are pure video, or photos don´t seem to blur/smudge, but solid 
color objects in the frame do.

Can anyone give an idea what to check?

The test system is encoding the frames in just 6 mS, so its not overloaded, 
and no error are reported.

As to the AVI output, I used a tool to check them, and it says that the file 
has interleaved content, Audio and Video streams, but that the ISINTERLACED 
flag in the avi main header is not set.  But with Microsofts AVI API 
AVIFileWriteStream etc, I can find no way to set this flag.

This is like pulling teeth!!

-----Original Message----- 
From: xvid-devel-request at xvid.org
Sent: Wednesday, June 11, 2014 12:00 PM
To: xvid-devel at xvid.org
Subject: Xvid-devel Digest, Vol 118, Issue 2

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   1. Re: Xvid-devel Digest, Vol 118, Issue 1 (Robin Colclough)

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Message: 1
Date: Tue, 10 Jun 2014 20:58:12 +0200
From: "Robin Colclough" <rcc at sentel-advance.com>
Subject: Re: [Xvid-devel] Xvid-devel Digest, Vol 118, Issue 1
To: <xvid-devel at xvid.org>
Message-ID: <E07ABCF23AB94EFEBE35AD541A859A9B at UsuarioPC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

Hi, and thanks for the replies which I?ve only just seen at the end of the
email; not familiar with this format yet.

I am using AVIStreamWrite to output the xvid encoded video and audio (lame
mp3 encoder).

I?m trying to synchronise 3D gpu frame drawing with the encoding process,
and its been quite difficult to do in real-time but I?m almost there.

The xvid encoder doesn?t always output a frame at each time slot, mainly
because the GPU can?t process more complex 3D within real-time constraints.

To handle this I now calculate the AVI write frame number using the elapsed
time, using QueryPerformanceCounter().

That seems to work, as the video file now tracks each frame to the correct
time spot.

The audio arrives every 2 seconds from the mp3 encoder, because the WAVE API
makes calls every 2 seconds with the cached audio stream.

The audio also records okay, BUT when I play the file its synced until I
click the player timeline to move the play point, then the audio is just not
synced anymore.

Its not an XVID problem as such, but so far I?ve no idea why the audio
stream doesn?t get set to the correct time.

Thanks
Rob

-----Original Message----- 
From: xvid-devel-request at xvid.org
Sent: Tuesday, June 03, 2014 12:00 PM
To: xvid-devel at xvid.org
Subject: Xvid-devel Digest, Vol 118, Issue 1

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Today's Topics:

   1. I set FPS to 120, encode 240 frames, and the video plays back
      over some 8-10 seconds (Robin Colclough)
   2. Re: I set FPS to 120, encode 240 frames, and the video plays
      back over some 8-10 seconds (Michael Militzer)
   3. Re: I set FPS to 120, encode 240 frames, and the video plays
      back over some 8-10 seconds (Elio Blanca)

----------------------------------------------------------------------

Message: 1
Date: Tue, 3 Jun 2014 10:33:23 +0200
From: "Robin Colclough" <rcc at sentel-advance.com>
Subject: [Xvid-devel] I set FPS to 120, encode 240 frames, and the
video plays back over some 8-10 seconds
To: <xvid-devel at xvid.org>
Message-ID: <D088D7DB96234E9CA1626705FEA34CCF at UsuarioPC>
Content-Type: text/plain; charset="iso-8859-1"

I?m using the xvid encoder in non-realtime to encode frames, but its like
xvid ignores the FPS I set, and records at the incoming speed.

I set the FPS to 120, then encode 240 frames, i.e, 2 seconds of video, put
the playback file is wrong, and runs at around the same speed I sent the
frames in.

Why would this happen?

------------------------------

Message: 2
Date: Tue, 03 Jun 2014 11:14:18 +0200
From: Michael Militzer <michael at xvid.org>
Subject: Re: [Xvid-devel] I set FPS to 120, encode 240 frames, and the
video plays back over some 8-10 seconds
To: xvid-devel at xvid.org
Message-ID: <20140603111418.k50oat31cgw8ogws at www.lansco.de>
Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes";
format="flowed"

Hi,

the first questions are: Which program/API do you use to encode your file?
And which program do you use to decode/playback?

Note that framerate information is not only written by the encoder into the
encoded bitstream but container formats (like AVI) have a framerate setting
in their container headers as well. The framerate as written in the
container usually precedes the framerate setting that the encoder wrote into
the bitstream.

In practice this means that if you e.g. write your video into AVI output
but don't set the framerate of the AVI properly, you can specify whatever
framerate you want in Xvid encoder settings but it will have no effect when
playing the file (because the AVI framerate precedes).

Best regards,
Michael

Quoting Robin Colclough <rcc at sentel-advance.com>:

> I?m using the xvid encoder in non-realtime to encode frames, but its
>  like xvid ignores the FPS I set, and records at the incoming speed.
>
> I set the FPS to 120, then encode 240 frames, i.e, 2 seconds of
> video, put the playback file is wrong, and runs at around the same
> speed I sent the frames in.
>
> Why would this happen?
> _______________________________________________
> Xvid-devel mailing list
> Xvid-devel at xvid.org
> http://list.xvid.org/mailman/listinfo/xvid-devel
>
>

------------------------------

Message: 3
Date: Tue, 03 Jun 2014 11:25:29 +0200
From: Elio Blanca <eblanca76 at users.sourceforge.net>
Subject: Re: [Xvid-devel] I set FPS to 120, encode 240 frames, and the
video plays back over some 8-10 seconds
To: xvid-devel at xvid.org
Message-ID: <538D9489.1030601 at users.sourceforge.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Further, I would suggest some useful free tools that can tell you many
details about the resulting
stream, such as "mplayer" (it is a command line tool, better results with
`mplayer -identify
video_stream_name'), "avidemux" and "media player classic - home cinema",
any of them can report
which frame rate has been set in the container header in order to clarify
where the error lies.

Il 03/06/2014 11:14, Michael Militzer ha scritto:
> Hi,
>
> the first questions are: Which program/API do you use to encode your file?
> And which program do you use to decode/playback?
>
> Note that framerate information is not only written by the encoder into
> the
> encoded bitstream but container formats (like AVI) have a framerate
> setting
> in their container headers as well. The framerate as written in the
> container usually precedes the framerate setting that the encoder wrote
> into
> the bitstream.
>
> In practice this means that if you e.g. write your video into AVI output
> but don't set the framerate of the AVI properly, you can specify whatever
> framerate you want in Xvid encoder settings but it will have no effect
> when
> playing the file (because the AVI framerate precedes).
>
> Best regards,
> Michael
>
>
> Quoting Robin Colclough <rcc at sentel-advance.com>:
>
>> I?m using the xvid encoder in non-realtime to encode frames, but its
>>   like xvid ignores the FPS I set, and records at the incoming speed.
>>
>> I set the FPS to 120, then encode 240 frames, i.e, 2 seconds of
>> video, put the playback file is wrong, and runs at around the same
>> speed I sent the frames in.
>>
>> Why would this happen?
>> _______________________________________________
>> Xvid-devel mailing list
>> Xvid-devel at xvid.org
>> http://list.xvid.org/mailman/listinfo/xvid-devel
>>
>>
>
>
>
>
> _______________________________________________
> Xvid-devel mailing list
> Xvid-devel at xvid.org
> http://list.xvid.org/mailman/listinfo/xvid-devel
>

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