Got artefacts when encoding

[colargol7]

Hello

Here's a strange problem again :

When I record HD movies from TV (french DVB-T, h264, eac3), they play fine in MPC.

But when I encode them with Megui, I got artefacts all over the video :
I never had this probleme until last week, and I didn't changed anything in my settings.

I use "x264 dxva HD extra quaoity" profile, but the result is the same whatever the profile I use.
I use DGAVCDec 1.09 as frameserver, and my avs is very short :

LoadPlugin("C:\video\dgavcdec109\DGAVCDecode.dll")
AVCSource("D:\HD\Caravaggio\1.dga")
BicubicResize(1280,720)

I don't know where this problem comes from, do you have an idea of what happened?
(some friends have the same troubles)


Thx for your help!!!


As usual, a sample :
http://www.mediafire.com/?ymwmmml22tj

http://thumbnails8.imagebam.com/3972/7fdfe539716881.gif (http://www.imagebam.com/image/7fdfe539716881)

[LoRd_MuldeR]

1. What build of x264 do you use?

2. What decoder do you use to check the resulting H.264 stream?

3. Did you check the input AVS script for artifacts in VirtualDub or a similar app?

4. Did you check your system with Prime95 and Memtest86+ ???

[poisondeathray]

Known issue with interlaced h.264 and DGAVCdec (still based on older version of libavcodec) . You will see similar artifacts with h.264 DVB .ts, and AVCHD transport streams when using DGAVCdec

Workaround is to use DGNVTools, or DirectShowSource/DSS2 + CoreAVC , or Divx h.264 , or recent ffdshow build

[LoRd_MuldeR]

Known issue with interlaced h.264 and DGAVCdec (still based on older version of libavcodec) . You will see similar artifacts with h.264 DVB .ts, and AVCHD transport streams when using DGAVCdec

Then the artifacts must appear also when he checks the input AVS script in VirtualDub (not only in the encoded video).

Colargol7, did you check this ???

Workaround is to use DGNVTools, or DirectShowSource/DSS2 + CoreAVC , or Divx h.264 , or recent ffdshow build

What about FFVideoSource?

[colargol7]

Thanks for replies.

You're right that's not an encoding problem.
The result is the same in virtualdubmod

If I use DirectShowSource, the video is ok.
(I use CoreAVC or ffdshow to decode)

I don't know FFVideoSource.
Should I use FFVideoSource or DirectShowSource instead?

[poisondeathray]

What about FFVideoSource?

I've always had difficulties with .ts and ffvideosource() , could never get it to work properly on my end. Theoretically it should work, as libav was updated in one of the recent betas by myrsloik (it's only the older libav versions that have problems with interlaced h.264)

[LoRd_MuldeR]

Doesn't FFVideoSource use Haali's TS parsing code?

Should I use FFVideoSource or DirectShowSource instead?

Use what works for you. DirectShowSource needs suitable DirectShow splitters+decoders to be available on your system. Also it has some problem with frame accuracy.

FFVideoSource should work "out of the box", but has some problems itself. At least FFVideoSource uses a much newer libavcodec version than DGAVCSourece...

[poisondeathray]

Doesn't FFVideoSource use Haali's TS parsing code?

From what I understand from the docs, I think it does.

I could never get transport streams to work with it, even .m2ts from blu-ray.

[colargol7]

So I'll use DirectShowSource.
But I don't understand what have changed since last 2 weeks.
I've already encoded many interlaced movies with dgavcdec without getting artefact :confused:
There have been changes in DVB-T video tracks?

Thank you again

[LoRd_MuldeR]

So I'll use DirectShowSource.
But I don't understand what have changed since last 2 weeks.
I've already encoded many interlaced movies with dgavcdec without getting artefact :confused:
There have been changes in DVB-T video tracks?

Thank you again

Probably you just had luck that you didn't encounter a capture, which casues DGAVCSource to fail, until now...

[colargol7]

Probably you just had luck that you didn't encounter a capture, which casues DGAVCSource to fail, until now...

I've already encoded at least an hundred of clips/movies with Megui/dgavcdec/x264 and I never noticed any artefact.

The problem appeared when they removed ac3 audio track from french dvb-t HD and replaced it with e-ac3.
I don't have any explication...

[LoRd_MuldeR]

Probably they switched their H.264 encoder at the same time or at least modified their encoder settings.

[colargol7]

Probably they switched their H.264 encoder at the same time or at least modified their encoder settings.It may be the reason...