Flashes between video clips after rendering

[Steve Rhoden]

If you have GPU enabled, disable it, and see if you get different results.

Steve Rhoden
(Cow Leader)
Film Editor & Compositor.
Filmex Creative Media.
https://www.facebook.com/FilmexCreativeMedia
1-876-461-9019

[Harry Mitchell]

I have already tried disabling “GPU acceleration of video processing” but I still get the same result.

[Bill Burnette]

The little gaps — check them to see if any of your “events” are not an exact number of frames long. It happened to me that a Canon camera produced clips that would show up with fractional lengths on the timeline. With “snap” on, it is impossible to remove the gaps except by trimming each such event at frame boundaries.

[John Rofrano]

It sounds like your clips are not ending on frame boundaries. This can happen if you use some 3rd party plug-ins that sync multiple cameras to audio because they might not sync on frame boundaries.

Look at the start of any event that has a black frame at the end and see if it starts on a frame boundary. If not, turn off Quantize to Frames, move the event so that starts on a frame boundary and turn Quantize To Frames back on again. If the start of the event is on a frame boundary then do the same with quantize to frames and extending the end of the event.

Bottom line: All video events must start and end on frame boundaries.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Harry Mitchell]

Sorry but I tried the suggestions above but no difference has been made.

So I turn of quantize to frames. I then zoom in all the way ,so I can a clear view of the cut between events, and move the event so it begins on the dotted line with the numbers at the top (which I’m assuming is the frame boundary). I then make sure it ends on a dotted line and do the same with the next clip.

How can I make sure that the events begin and end exactly on a frame boundary?

~Harry

[John Rofrano]

[Harry Mitchell] “How can I make sure that the events begin and end exactly on a frame boundary?”

Always make sure that Quantize to frames is on so that when you drop media onto the timeline, it always gets dropped on frame boundaries.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Harry Mitchell]

But you just told me to turn it off so I can make sure all the events begin and end on a frame boundary.

~Harry

[John Rofrano]

[Harry Mitchell] ” But you just told me to turn it off so I can make sure all the events begin and end on a frame boundary.”

I’m sorry if my instructions were confusing. Please allow me to explain:

Quantize to Frames ensures that you can only make edits on frame boundaries. It should always be enabled if there is any video in your project. It’s only purpose as an option is for people who use Vegas as a Digital Audio Workstation (DAW) tool. It should never be disabled for video editors.

I told you to turn off Quantize because somehow, you have gotten yourself into a situation that should never have happened. Somehow your video edits are not on frame boundaries. To correct this situation, you need to turn OFF Quantize, move the video back to a frame boundary, and turn ON Quantize again so that it doesn’t happen in the future.

So I told you to turn off quantize temporarily to fix the problem and then turning it back on to make sure it doesn’t happen again. You should always edit video with Quantize to Frames turned ON.

Does that make sense?

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Harry Mitchell]

Ok I do what you say. I turn off quantization and move each event so it begins and ends on a frame boundary but the problem still persists.

Also I’m still not quite sure why we are turning off quantization in the first place. I’m moving the events so they begin on a frame boundary but surely that is the job quantization is meant for. So how can I make sure the event is starting exactly on the the frame boundary if quantization has been turned off and why not just leave it on if it’s supposed to make sure all events start and end on a frame boundary?

[Mike Kujbida]

[Harry Mitchell] “So how can I make sure the event is starting exactly on the the frame boundary if quantization has been turned off…”

Zoom in pretty close to the end of an event on your timeline. Place your cursor at what you think is the end of the event. Use the left and right arrow keys to go back one frame and then forward one frame. If the cursor ends at the end of the event, you’re OK. If it doesn’t, go back one frame and drag the end of the event back to the cursor. Repeat this procedure for all problem events.

HINT: place the cursor at the beginning of the first event and use the numeric 9 key to move to forward to the end of the event (numeric 7 key moves back to the beginning of the event). Use the left and right arrow keys as explained above to ensure that the cursor is stopping on a frame. If it doesn’t, repeat the above procedure.
Press the numeric 9 key to jump to the beginning of the next event.
Repeat as necessary.

NOTE: If you have events on more than one track, you’ll have to do this for all events on each track.

[Harry Mitchell] “why not just leave it on if it’s supposed to make sure all events start and end on a frame boundary?”

That’s the way you’re supposed to edit.
To repeat what John said in the post above yours: “You should always edit video with Quantize to Frames turned ON.”