Enter a value in the box to set the rate of playback. For example, a setting of 1 will play at normal speed, while 0.5 will play at half speed.
Each video event in your project has a specific duration that is not changed by adjusting the playback rate. If you decrease the speed of a ten-second video event by 50%, only five seconds of video will be shown. On the other hand, if the speed is increased 200%, the ten seconds of video will play in only five seconds. The remaining five seconds of the event will be filled either with a freeze of the last frame or with ten additional seconds of video content from the media file (if the source media is longer than the event).
Enter a value in the box to simulate a lower frame rate. For example, if you enter 0.5 in the box, the event will play at half its original frame rate, and each frame will be held twice as long as in the original media file, creating a strobe effect."
I gotta say that I dont totally understand what they are saying but it doesnt sound like it would separate the 50p frames to produce slow motion in 25fps.
play back rate is what it says. At 50% playback rate your video will be at half speed. The 50p or 60p framerate of the camera will only be a factor in the quality of the image (which should be very good). The project frame rate and the playback rate of the clip are two different things.
In the original post you said something about sound. Do you want the sound to playback at 50% also? This is a whole other problem with unique solutions.
Set project to 60fps, set ruler to Absolute Frames. Note number of frames in clip.
Change project to 25fps. Ctl+Drag end of clip so it's exact same number of frames long. Job done.
Changing playback rate should work but the numbers have to be exact or some resampling may occur. Working with exact frame numbers seems more reliable to me.
Note that S&Q motion in the EX1 will yield better image quality for SloMo than 50p or 60p as the camera writes way more data. Remember to use a faster shutter speed when shooting SloMo.
Haven't a clue why you want the audio, it'll be toast.
Also as a sidenote if you're having trouble and footage looks "interlaced" when doing time streching on vegas timeline with MXF files you should right click on the clip you're changing speed of, choose properties check "disable resample". This will make it perfectly smooth.
I want audio because I shoot a lot of music videos and this way the playback is really easy to sync with the footage.