Preview fps with m2t

Wolfgang S. wrote on 7/17/2005, 11:39 AM

Just a question, that came up today: if we play an m2t file in the timeline - Vegas 6b - typically we have a preview speed of 10 fps only, in the quality "preview (auto)".

However, if we play the same m2t file in windows media player 10, but also in PowerDVD (maybe with renaming the extention from *m2t to *mpg), we have the full preview quality (PAL, 25 fps).

In other words: preview quality in Vegas for m2t files seems to be limited within Vegas, but not by the PC power.

Any idea why we have such a reduced number of fps in Vegas?
Any workarounds how we could improve the situation in Vegas?

PC: P4 3.2 Ghz 1 GB Ram.

Comments

VOGuy wrote on 7/17/2005, 12:23 PM

Hi Wolfgang.

Make sure your "Project Properties" are set to match the properties of the clip as it came in from the camera. I believe that the "Cineform 1080i" setting is the one to use. Also, lowering the preview quality setting to "draft" will help.

I've found that the WM player will sacrifice display quality, particularly in moving parts of the picture in order to display a high frame rate.

Travis

Wolfgang S. wrote on 7/17/2005, 2:19 PM

Travis,

the project properties are set to HDV 1080 50i, what fits nice to the PAL m2t footage. The material has not been rendered to the cineform codec (beside the fact, that the project properties do not specify any codec, but only pixel size of the material, field order, pixel aspect ratio and frame rate). No, project properties are not the reason for the poor preview quality - it must be something else.

To reduce the preview quality further does not help either - fps stay as low as measured.

No, there must be other reasons why the fps in the preview is so low - since the PC is able to play the m2t footage with the windows media player in full quality (high resolution, high number of fps).

epirb wrote on 7/17/2005, 7:11 PM

Wolfgang , I forget why it is that way, but it has something to to with buffering of some sort, maybe Spot can chime in if he reads this.
But its the same reason if you click on an m2t file within Vegas in the explorer tab and preview the clip it plays at full frame rate, albeit I notice some hiccupds in the audio, but I thought I remember Spot saying something about it not being buffered in those players.

Not an swer I know but just my 2cents worth.

Wolfgang S. wrote on 7/18/2005, 12:24 AM

Interesting. I will try if the explorer tab plays the preview with full fps. Will give that a try, even if it is no solution, I am afraid.