weird artifact on ogm streams

[ivan_alias]

I have done a couple of xvid / ogg streams using oggmux of various versions and each has a small strange atrifact in the top left corner. Like a small horizontal line thats thre all the way through. Its not there when I play the xvid on its own before its muxed with the ogg audio.

Anyone else seeing this?

If this don't make any sense I'll try post a screen shot later when I get home.

[MaTTeR]

How did you mux the file? Either manually with GraphEdit or Koepi's OggMux? OS? OggDS version?

Also, please remember that Ogg is a container format similar to AVI. Vorbis is the audio stream you muxed. Lots of people are confusing terms;)

[Nic]

That confusion isn't helped by its creators always referring to it as Ogg.... :)

-Nic

[ivan_alias]

Oh well just to clarify...

Its an xvid video with a vorbis audio track, muxed into an ogg stream using Koepi's OggMux :)

I believe the terms are correct now :)

I have version 0.9.9.0 of the DS filters and xvid build from a couple of days ago - 5th April.

And I have it on both ogg movies I've done this way. The artifact is there all the way through the film by the way.

Would a screenshot help?

[EDIT] Tried to take a screenshot, but when I pause MP 6.4 the artifact goes away :( . To describe it better its a small grey and silver broken horizontal line that appears to be flashing right up in the top left hand corner of the screen. ITs especially noticeable in dark scenes of course.

Anyone else seen this?

[MaTTeR]

I'm curious if this artifact would show if you opened it up in Vdub and skipped through some frames.

What resolution did you encode at?

[ivan_alias]

It doesnt appear in VDUB or on any of my other xvid films that I have done with mp3s in the usual way. (normal avi streams)

Only on the ones muxed into ogg streams.

Resolution 640x352

[Rasi]

i have the same thing.. although it is just muxxing and no reencoding, some frames simply mess up and look like the old divx3.11 bug...

i really have no clue about how this even can be possible as creating an ogm mainly should leave the source avi exactly like it is.. but somehow it doesnt for me... it changes some frames...

[kastro68]

Originally posted by MaTTeR


Also, please remember that Ogg is a container format similar to AVI. Vorbis is the audio stream you muxed. Lots of people are confusing terms;)


Is the Vorbis audio already in an ogg container???

If so, then it would be like putting an mp4 video with a vorbis audio (which is in an ogg container) into a BIGGER ogg container.

In short, would it be correct so say that a smaller ogg container is being placed inside a bigger ogg container?

[MaTTeR]

Originally posted by kastro68
Is the Vorbis audio already in an ogg container???
Yes, the encoder apps are actually just dumping the Vorbis audio into an Ogg container.


In short, would it be correct so say that a smaller ogg container is being placed inside a bigger ogg container? I think it might be safe to say that though maybe one of the developers here could it explain that concept a little better. I'm not familiar with some of the transcoding code that makes this process happen.

[Neo Neko]

When you mux an OGG-Vorbis File with an MPEG4 video you end up with an OGG file with Vorbis audio and MPEG4 audio. Not an OGG container with an OGG container with Vorbis and an MPEG4 stream. So the muxers pull the video stream out of the AVI and the audio stream out of the ogg and then interleaves the two into a new OGG container. There are no containers inside containers or anything like that. Clean and neat is the word to describe it.