Edges chopped off on burned DVD

[rbroberts]

I have some video I generated using Celestia.  I captured video as
640x480 OGG Theora at 29.97 fps,  then imported it into Kino.  After
editing, I exported as mpeg for qdvdauthor, then laid our my menus and
chaptere and burned a DVD.

If I play the VOB file with xine or mplayer, it looks fine.  mplayer
does tell me it is prescaling the video to 720x540 to get the 4:3 aspect
ratio correct (it *is* 4:3).

But when I play back the DVD on my analog TV, I've lost part of the
edges on all four sides.  I can tell its missing because Celestia has
text displayed in those areas and its chopped off.

If I play it on a high-end upscaling DVD player on my 50-inch plasma TV,
the sides are fine, but the top is still missing several lines.

What am I doing wrong?

roland

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[varokan-2]

This sounds more like a question for the dvdauthor mailing list. What is
the aspect adn resolution you see in the dvdauthor.xml file ? what is
mplayer telling you about the video ( -identify flag )

Varol

Roland Roberts wrote:

> I have some video I generated using Celestia.  I captured video as
> 640x480 OGG Theora at 29.97 fps,  then imported it into Kino.  After
> editing, I exported as mpeg for qdvdauthor, then laid our my menus and
> chaptere and burned a DVD.
>
> If I play the VOB file with xine or mplayer, it looks fine.  mplayer
> does tell me it is prescaling the video to 720x540 to get the 4:3 aspect
> ratio correct (it *is* 4:3).
>
> But when I play back the DVD on my analog TV, I've lost part of the
> edges on all four sides.  I can tell its missing because Celestia has
> text displayed in those areas and its chopped off.
>
> If I play it on a high-end upscaling DVD player on my 50-inch plasma TV,
> the sides are fine, but the top is still missing several lines.
>
> What am I doing wrong?
>
> roland
>
>  

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[Ben Blout-2]

>Date: Thu, 10 Apr 2008 21:33:27 -0400
>From: Roland Roberts <roland@...>
>
>I have some video I generated using Celestia.  I captured video as
>640x480 OGG Theora at 29.97 fps,  
<snip>
>If I play the VOB file with xine or mplayer, it looks fine.
<snip>
>But when I play back the DVD on my analog TV, I've lost part of the
>edges on all four sides.  I can tell its missing because Celestia has
>text displayed in those areas and its chopped off.
<snip>
>If I play it on a high-end upscaling DVD player on my 50-inch plasma TV,
>the sides are fine, but the top is still missing several lines.
>
>What am I doing wrong?

I am not sure, but I think everything is just fine!  You are running
into something called 'overscan'.  From en.wikipedia.org/wiki/Overscan:

     Overscan is extra image area around the four edges of a video image
     that is not normally seen by the viewer. It exists because
     television sets in the 1930s through 1970s were highly variable in
     how the video image was framed within the cathode ray tube (CRT).

Read the wiki page for more details - you may find them helpful.

You can get an approximation for this phenonema by using the "Visible
Region" option under tools.  I don't know if the visible region follows
the conventions mentioned in the wikipedia article.

I hoped this helps.

If the above isn't clear, feel free to ask for more details.

-Ben B




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[rbroberts]

QDVDAuthor wrote:
> This sounds more like a question for the dvdauthor mailing list. What
> is the aspect adn resolution you see in the dvdauthor.xml file ? what
> is mplayer telling you about the video ( -identify flag )
266 roland> grep 'video format' /tmp/AstroClub-20080410/dvdauthor.xml
   <video format="ntsc" aspect="4:3" resolution="720x480" />
   <video format="ntsc" aspect="4:3" resolution="720x480" />

I assume you are referring to the files which get used by dvdauthor to
go onto the DVD.  The report 720x480 with a 4:3 aspect ratio.

356 roland> mplayer -identify -vo null -frames 1 AstroClub-20080410001.mpeg
MPlayer 1.0rc2-4.1.2 (C) 2000-2007 MPlayer Team
CPU: Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz (Family: 6, Model:
15, Stepping: 6)
CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
115 audio & 237 video codecs
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote
control.

Playing AstroClub-20080410001.mpeg.
ID_VIDEO_ID=0
ID_AUDIO_ID=0
MPEG-PS file format detected.
VIDEO:  MPEG2  720x480  (aspect 2)  29.970 fps  7500.0 kbps (937.5 kbyte/s)
ID_FILENAME=AstroClub-20080410001.mpeg
ID_DEMUXER=mpegps
ID_VIDEO_FORMAT=0x10000002
ID_VIDEO_BITRATE=7500000
ID_VIDEO_WIDTH=720
ID_VIDEO_HEIGHT=480
ID_VIDEO_FPS=29.970
ID_VIDEO_ASPECT=0.0000
ID_AUDIO_FORMAT=80
ID_AUDIO_BITRATE=0
ID_AUDIO_RATE=0
ID_AUDIO_NCH=0
ID_LENGTH=232.82
==========================================================================
Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
VDec: vo config request - 720 x 480 (preferred colorspace: Mpeg PES)
VDec: using Mpeg PES as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
VO: [null] 720x480 => 720x480 Mpeg PES
Selected video codec: [mpegpes] vfm: mpegpes (MPEG-PES output (.mpg or
DXR3/IVTV/DVB/V4L2 card))
==========================================================================
ID_VIDEO_CODEC=mpegpes
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 48000 Hz, 2 ch, s16le, 224.0 kbit/14.58% (ratio: 28000->192000)
ID_AUDIO_BITRATE=224000
ID_AUDIO_RATE=48000
ID_AUDIO_NCH=2
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
ID_AUDIO_CODEC=mp3
Starting playback...
VDec: vo config request - 720 x 480 (preferred colorspace: Mpeg PES)
VDec: using Mpeg PES as output csp (no 0)
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
ID_VIDEO_ASPECT=1.3333
VO: [null] 720x480 => 720x540 Mpeg PES
A:   0.2 V:   0.0 A-V:  0.126 ct:  0.000   1/  1 ??% ??% ??,?% 0 0

Exiting... (End of file)

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[varokan-2]

This is probably unrelated but according to DVD spec NTSC mp2 is not a
requirement. Most player will play it but some might have issues with
it. Funny thing is that for PAL it is a requirement.

I learned that after working on QDVDAuthor for about three years. I will
yet have to change my menu creation to use a52 audio, which is a
requirement in both NTSC and PAL.

Besides this your video looks okay.

Varol :)

Roland Roberts wrote:

> QDVDAuthor wrote:
>  
>> This sounds more like a question for the dvdauthor mailing list. What
>> is the aspect adn resolution you see in the dvdauthor.xml file ? what
>> is mplayer telling you about the video ( -identify flag )
>>    
> 266 roland> grep 'video format' /tmp/AstroClub-20080410/dvdauthor.xml
>    <video format="ntsc" aspect="4:3" resolution="720x480" />
>    <video format="ntsc" aspect="4:3" resolution="720x480" />
>
> I assume you are referring to the files which get used by dvdauthor to
> go onto the DVD.  The report 720x480 with a 4:3 aspect ratio.
>
> 356 roland> mplayer -identify -vo null -frames 1 AstroClub-20080410001.mpeg
> MPlayer 1.0rc2-4.1.2 (C) 2000-2007 MPlayer Team
> CPU: Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz (Family: 6, Model:
> 15, Stepping: 6)
> CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
> Compiled with runtime CPU detection.
> 115 audio & 237 video codecs
> Can't open joystick device /dev/input/js0: No such file or directory
> Can't init input joystick
> mplayer: could not connect to socket
> mplayer: No such file or directory
> Failed to open LIRC support. You will not be able to use your remote
> control.
>
> Playing AstroClub-20080410001.mpeg.
> ID_VIDEO_ID=0
> ID_AUDIO_ID=0
> MPEG-PS file format detected.
> VIDEO:  MPEG2  720x480  (aspect 2)  29.970 fps  7500.0 kbps (937.5 kbyte/s)
> ID_FILENAME=AstroClub-20080410001.mpeg
> ID_DEMUXER=mpegps
> ID_VIDEO_FORMAT=0x10000002
> ID_VIDEO_BITRATE=7500000
> ID_VIDEO_WIDTH=720
> ID_VIDEO_HEIGHT=480
> ID_VIDEO_FPS=29.970
> ID_VIDEO_ASPECT=0.0000
> ID_AUDIO_FORMAT=80
> ID_AUDIO_BITRATE=0
> ID_AUDIO_RATE=0
> ID_AUDIO_NCH=0
> ID_LENGTH=232.82
> ==========================================================================
> Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
> VDec: vo config request - 720 x 480 (preferred colorspace: Mpeg PES)
> VDec: using Mpeg PES as output csp (no 0)
> Movie-Aspect is undefined - no prescaling applied.
> VO: [null] 720x480 => 720x480 Mpeg PES
> Selected video codec: [mpegpes] vfm: mpegpes (MPEG-PES output (.mpg or
> DXR3/IVTV/DVB/V4L2 card))
> ==========================================================================
> ID_VIDEO_CODEC=mpegpes
> ==========================================================================
> Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
> AUDIO: 48000 Hz, 2 ch, s16le, 224.0 kbit/14.58% (ratio: 28000->192000)
> ID_AUDIO_BITRATE=224000
> ID_AUDIO_RATE=48000
> ID_AUDIO_NCH=2
> Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
> ==========================================================================
> AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
> ID_AUDIO_CODEC=mp3
> Starting playback...
> VDec: vo config request - 720 x 480 (preferred colorspace: Mpeg PES)
> VDec: using Mpeg PES as output csp (no 0)
> Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
> ID_VIDEO_ASPECT=1.3333
> VO: [null] 720x480 => 720x540 Mpeg PES
> A:   0.2 V:   0.0 A-V:  0.126 ct:  0.000   1/  1 ??% ??% ??,?% 0 0
>
> Exiting... (End of file)
>
>  

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[rbroberts]

Ben B wrote:
> I am not sure, but I think everything is just fine!  You are running
> into something called 'overscan'.  From en.wikipedia.org/wiki/Overscan
Thanks, I asked the question on the dvdauthor mailing list and they
pointed me to the same place.  I've subsequently padded my video then
rescaled back down to the right sized to avoid chopping off the edges of
the text.  Thanks!

roland

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