16:9??

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gogander
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16:9??

Postby gogander » 17 Sep 2008 17:54

Hey! I have an .avi file, exported from Adobe Premiere with 720x576 16:9 pixel aspect ration. Vlc seems to not understand this, and plays it as a 4:3 video. The only way I've been able to fix this is to right click in vlc while the video plays and choose: video-->aspect ratio--->16:9. The problem is that it's really annoying doing this every time i play a video, I'm working with video so there can be some files through a day. Mpeg-2 720x576 16:9 aspect works without any probelm.

And another thing, how to i change the file Icons? If I don't want the... hmm, "orange hat", don't know the name of it in english:p

DJ
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Re: 16:9??

Postby DJ » 18 Sep 2008 00:54

The aspect ratio is contained in the header for the container and is generally pulled from the original file format when the audio and video etc. are placed in the container. VLC uses this information to set the proper aspect ratio. If you can specifically tell VLC to set the desired aspect ratio when it is obviously wrong like 4x3 it seems more like an encoding issue. If you always deal with 16x9 cropped video, you can override the default in preferences.

gogander
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Re: 16:9??

Postby gogander » 18 Sep 2008 11:14

But the thing is, the video file is exported directly from an Adobe Premiere PAL 16:9 Widescreen Project, with 720x576 16:9 Aspect Ratio. So if anyone got Premiere and VLC, I would like to hear their result if they try the same=)

gogander
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Re: 16:9??

Postby gogander » 18 Sep 2008 11:18

BTW: MPC(Media Player Classic) plays it correct, so does Windows Media Player and J River Media Center. So it seems like there's something VLC fails to read in the file... or?

VLC_help
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Re: 16:9??

Postby VLC_help » 18 Sep 2008 14:40

Can you upload sample file somewhere? AVI doesn't support pixel aspect rations properly, that is something that codecs have to handle.

gogander
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Re: 16:9??

Postby gogander » 18 Sep 2008 15:53

Sure, http://driftingdots.com/files/test.avi

.AVI file, exported from Premiere Pro 720x576 16:9, Widescreen Pal Project.

VLC_help
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Re: 16:9??

Postby VLC_help » 19 Sep 2008 20:51

Confirmed, they are DV AVI. I opened trac ticket
http://trac.videolan.org/vlc/ticket/2092

Lotesdelere
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Re: 16:9??

Postby Lotesdelere » 20 Sep 2008 11:54

VLC should fallback to read and apply the aspect ratio information from the video stream if it's not available in the header.
And AFAIK there is no such AR information in AVI files header.

However I've just tried with a H264 video stream of 720*576 with AR 16:9 in a AVI container and it's working fine, so I guess VLC can do the above for some types of video streams but not for some other ones ?

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Re: 16:9??

Postby The DJ » 20 Sep 2008 12:50

The problem with DV is that it is not fully supported. The DV fileformat has a flag that says wether or not something is 16:9. (the information is often not in the video) and i believe we cannot read this information from DV. I'll take a look at the sample, but if I remember correctly, last time I looked at this, i think i came to the conclusion that it was quite difficult to fix without adding ugly DV specific hacks into our CORE. (adding hacks in a module is one thing, but adding them in our core is something i'd rather not.)
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