On Mon, 23 Feb 2004, Jonathan Woithe wrote:
> Hi there
>
> [ Please CC me since I don't subscribe to this list ]
I usually do NOT do that - I consider it impolite to not join the
group but still ask people for advice/answers/help.
Want some help? Join the community - it is a low volume and usually
informative mailing list.
> The resulting disk played fine in a Pioneer DV-344 DVD player except for one
> rather noticeable problem. Whenever there was moderate motion of the
> subject, considerable artifacts were observed. If the subject waved their
> arm around a blocky trail would appear, disappearing around half a second
> later on average.
Could be the same problem that Apple's MPEG-2 decoder has: lack
of DPME (Dual Prime Motion Estimation) decoding support.
What happens if you play the DVD using Ogle? It also does not
implement DP decoding.
> When the .m2v was played back on MPlayer 1.0.0pre1 these artifacts were not
> visible.
> I'm reluctant to blame the hardware DVD player for much of this since it's a
> Pioneer DV-344 which has a reputation for playing anything you throw at it.
Hmmm, the pioneers I've had references to were the opposite - sometimes
picky about what they'd play - now a Philips player will play anythin
short of a piece of paper :)
> The result of all this is that it seems mjpeptools is putting something into
> the P frames which the hardware DVD players don't like. Software players
> (Mplayer, ffplay) seem quite happy with them though, which is curious.
No, it's the lack of B frames.
> Can anyone shed any light on these observations - either in terms of ways to
> "fix" the P frames or to make the "I frame only" stream happy with fast
The answer will be to the mailing list :)
Steven Schultz
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