Re: interlacing artifacts on copy but not on source

On Thu, 2009-04-30 at 08:47 -0400, Brian J. Murrell wrote:
> The subject might be a bit misleading but one can put only so much in a
> subject line.
> 
> I have a DVD which I am trying to rip to my PVR.  The source material is
> 720x480x29.970 and is definitely interlaced, which is not surprising
> given the framerate indicates that it was likely videotaped at source,
> not filmed.  This is what mplayer -v has to say about it:
> 
> MPEG-PS file format detected.
> Searching for sequence header... OK!
> VIDEO:  MPEG2  720x480  (aspect 3)  29.970 fps  9800.0 kbps (1225.0 kbyte/s)
> [V] filefmt:2  fourcc:0x10000002  size:720x480  fps:29.97  ftime:=0.0334
> 
> When I play this on an interlaced television it looks great.  No
> interlacing artifacts can be seen.
> 
> I tried to make an "exact copy" of this DVD by setting my final rip size
> to 720x480 as well, without any zoom, crop, de-interlacing or filters,
> etc.  This is what mplayer -v has to say about my ripped copy:
> 
> AVI video size=1294701368 (149993) audio size=280336896 (280336896)
> VIDEO:  [DIVX]  720x480  24bpp  29.970 fps  2069.5 kbps (252.6 kbyte/s)
> [V] filefmt:3  fourcc:0x58564944  size:720x480  fps:29.97  ftime:=0.0334
> 
> The above rip is also interlaced, but when I play it on the exact same
> television using the exact same video playing software, it is displaying
> interlacing artifacts like crazy.  I can only guess that the interlaced
> frames in the copy are not being displayed in the correct phase with the
> interlacing of television (if that phrasing is at all meaningful).  What
> I mean is that perhaps the odd/even frames in the rip are being shown on
> the even/odd frames of the television -- opposite of what they should be
> showing.
> 
> Any ideas?

Nobody has any ideas about what might be going on here?  Given that I am
using ffmpeg/mpeg4 for the transcode, maybe I should go ask on the
ffmpeg list.  Or would I be more successful on the transcode list given
that it's transcode that is driving ffmpeg?

Thanx,
b.

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