You_Too said:
And Chewtobacca: On avisynth wiki it says:
The second one (Rec.709) should be used when your source is DVD or HDTV:
<pre>ConvertToRGB(clip, matrix="rec709")</pre>
So it's not about output but input it seems.
It should technically be on both. Whatever you play the final output on should be expecting something that's been encoded with the rec709 matrix. The effect of using the wrong matrix is a slight remixing of RGB channels, which you may find gives a result more to your liking anyway.
DE