best way to export premiere sequence for encoding it with x264

[codemaster]

What is the difference between the following two metods:

Method 1:
- export the sequence using the debugmode frameserver plugin, mode rgb24;
- open the avi signpost in avisynth, convert to yv12 matrix rec601 (premiere sequence is SD);
- save that avs script;
- open that avs script in virtualdub;
- set "video -> color depth... -> output format to compressor/display" to yv12;
- at "video -> compression...", select "Lagarith Lossless Codec", and mode yv12;
- "file -> save as avi...";
- open the avi in avisynth and frameserve to x264.

Method 2:
- export the sequence using "microsoft avi" instead of "debugmode frame server";
- select the Lagarith codec, and mode yv12;
- render;
- open the avi in avisynth and frameserve to x264.

Both methods will produce the same result ? In case of method 2, when Lagarith receives rgb input, it will be converted by lagarith to yv12 the same way avisynth converts it to yv12 ? Is method 1 redundant or unncecessary, because method 2 generates the same result ? Or do you recommend other methods ?

[_Al_]

Why don't you just select yuv in dmfs and load signpost.avi into Avisynth ? And then into x264 encoder, everything in one go. No color space change involved, no intermediate involved.

[codemaster]

Because I have 1,3GB RAM, which is enough to edit SD in Premiere Pro CS3, but not enough for Premiere + QTGMC + x264. But if I render all frames to an intermediate file, then I can close Premiere, so that there will be enough ram for QTGMC + x264.