Will Avisynth 'Directshowsource' Produce Reduced Quality in Frames Served?

[Chakra]

Hi,

I want to use Avisynth to frame serve to Virtualdub. I can't load the video directly into VDub so I think to use Avisynth's 'directshowsource' capability to serve the frames.

Question is, if I use directshowsource does that automatically mean that I lose quality for each frame served relative to the quality of the original video file?

[Baldrick]

No.

But you can't use the Video->Direct stream copy-mode in Virtualdub if you just are going to cut the video. Or well you can use it but you will get uncompressed video=HUGE. You must then use a compression that means you lose quality.

[Chakra]

Okay, Baldrick, many thanks - I think I see how the 'chain' works now.

[dragonkeeper]

Hi,

I want to use Avisynth to frame serve to Virtualdub. I can't load the video directly into VDub so I think to use Avisynth's 'directshowsource' capability to serve the frames.

Question is, if I use directshowsource does that automatically mean that I lose quality for each frame served relative to the quality of the original video file?

What type of video is it mv4, mkv, mp4?
What ae you trying to do to the video we may be able to offer up some better solutions.

[AlanHK]

Question is, if I use directshowsource does that automatically mean that I lose quality for each frame served relative to the quality of the original video file?

You don't lose quality when frameserving, but you have to recompress to make your output file, and that's when you will, inevitably.


Also, DSS may misorder frames. Usually not a problem if you're not doing a lot of Trim()s.

I prefer to use FFMPEGSource2 when AviSource doesn't work. It seems very stable, and lets me seek through a video with VBR audio and stay in sync.