unexpected jumping frames

[dplaton]

Using Aviaynth (2.08 or 2.5) even at the minimal filtering (blur, sharp)
I get some random distribuited jumping frames, no to much about 2 or 3
sequences on an 15 minutes clip.
Is there a way to locate other then visual the jumping frames, in order
to re-encode or eliminate this very annoing behavoir.

I try for some weeks to find an answer.

[Manao]

How do you get your video into avisynth ? AviSource ? Mpeg2Source ? DirectShowSource ?

If it's Mpeg2Source, what dll are you using ? MpegDecoder.dll ? MPEG2DEC3.dll ? DGDecode.dll ?

Also, did you try latest avisynth ( 2.5.5 )

[dplaton]

Thank you for answer, and sorry for the lack of information.
the source is a VHS -> YUY2 capture RAW avi
Everything is OK in the most part of the m2v encoded clip,
but not related with the encoder some scenes randomly are jumping up and down.
If I use VirtualDub no jumping scenes.
On a variant of decomb use I experienced a horizontal jumping.
I belive is something with the frame order or aligniament, but why
is random?

[dplaton]

I tryed with 2.5 not the very last but a little older, maybe one month older.

[Mug Funky]

what's your script? is it back-and-forth jumping, or jerky motion from repeated frames?

also, what is being used to decode the YUY2? huffyuv? ffdshow?

there's so many variables, it may be best to post everything you're doing, including script, codecs used (find these in "file->properties" in virtualdub), and stuff like that.

one possible difference is that VirtualDub asks for RGB colour, where avisynth prefers YV12, but will take anything. so to me this sounds like a codec issue. try installing ffdshow and enabling raw video in it (for all colourspaces), though this may just turn your video upside-down...

[vinetu]

dplaton, is your problem similar to that (http://forum.doom9.org/showthread.php?threadid=39644&highlight=capture+AND+avisynth+AND+frame+AND+bug) ???

What is your capture card?

[dplaton]

1. conexant capture card
2. droped frames 0-25 for 15 minutes capture
3. uncompressed capture YUY2
4. even minimal script cropbottom() induces random jumping up and down
and/or green splashes.
5. with decomb (I forgot the setings) and some settings the jumping is
changing in forward and backward movements.
6. standard decomb gives the random jumping
7. I eliminate decomb and I "deinterlaced" with blur and sharp, again
the random jumpings.
8. PC Duron 950, SDRAM 256+128, video on board
9. no preview
10. output to mpeg2 encoder.

[vinetu]

If you can isolate a 700Mb part of your capture which contain "jumping" frames,
write it to CD and check on another "avisynth inside" computer and then post here-
you will help the "investigation" of the problem.

Best Regards

[dplaton]

I didn't know the jumping problem until I played the DVD
on a DVD standalone (my target).
After I noticed that something is wrong, I looked at the MPEG2
source, and I found the jumping frames and/or some frames 1-3 green
or with green splashes.
This was happent also at my first encodings with QuEnc to SVCD format.
At that moment I considered that I have used a too high rate to make a
X-SVCD.
Thank you for your answers, and please don't spend any more time on this topic, because I will use only VirtualDub MPEG2.
Also textsub() [VSfilter] dosen't work for me, and I don't know why.
I use MaestroSBT, and the job is donne properly.

:) :( :)

Thank you again for your time and efforts.