@iEmby Are you sure you have "Quantize to Frames" enabled?

Your footage probably doesn't fit the position of the render frame exactly. Rendering is based on the render frame position, when your footage is not exactly in the render frame position, it's very likely that the front or back of the footage will be mixed with black frames.

Enable Quantize to Frames to avoid frame position errors during editing. Of course, it only aligns the footage to the project frame position. Be especially careful when your render framerate differs from your project's. The frame size and framerate of rendering are completely based on the rendering template, not your project properties.

If you are writing a similar script, you should also manually quantify it to the render frame position in the script content and then render it. Or most simply, put it at the beginning.

@VEGASDerek sir.. u need to see this... and may be it will be fixed in next update...

cos i already sent a defected video due to this error to my client.

although that will be managed this time .... but it should be fixed.. soon

thankyou.

Enable Quantize to Frames to avoid frame position errors during editing. 

this should not be applicable for rendering at least. Especially When i am selecting only one Event by double clicking.

and in matter of Enable Quantize Frames ... i never put them ON..

coz that make issue in snapping sometimes..

in my opinion.

Quantize To Frames should not be considered while rendering

@iEmby Nope, I can't replicate that unless I'm missing something ?

in my opinion.

Quantize To Frames should not be considered while rendering

@iEmby Rendering is based on the exact frames. When you select, the render region you select is always quantized to integer frames. You can try selecting a loop region and then Shift+B. The selection end is always automatically quantized to an integer frame.

In all NLE except VEGAS Pro, frames are always strictly quantified. So they "don't have" such a problem. For VEGAS Pro, it's possible to edit without quantizing frames. However, frames are still quantified during rendering: NLEs cannot directly render a media file with a variable framerate.

@iEmby: You should by all means have 'Enable Quantize to Frames' enabled all the time when editing videos. Otherwise your frames are not aligned and you're counting on error corrections.

Or, if you just want to transcode your footages for a better editing experience, I recommend using FFmpeg in your scripts. Although it has additional learning costs, once mastered, it can be a very useful tool.

I am still getting it

even quantize Frames are ON or OFF

I am still getting it

even quantize Frames are ON or OFF

@iEmby As I said above, "Quantize to Frames" is based only on the project framerate, not render framerate. Now, you want to render, you can either:

• Change the render framerate to the project framerate.

Or:

• Move the footage to a suitable position based on the render framerate via script, and then render it.

For example, your project is 29.97fps, so you should render it at 29.97fps, not 25fps.

If you want the script to be available without "Quantize to Frames" enabled, you can use the latter option. It's easy, I'm sure you can do it on your own.

@iEmby I just tried multiple files, old & new, AVC, HEVC, different aspects, different frame rates, constant & variable, still no black frame,

This one is variable with an unquantified end, still no black frame at the start or end ,

Adding to @zzzzzz9125 's comment, if you enable (check) 'Show Unquantized Event Edges' under the Quantize to Frames in the Options menu, and unquantized frame edges will be highlighted in red:

As expected and unsurprisingly, a black frame feartures at the head of the render of the video event. For around 10 years, I've had unquantized frame edges enabled (it used to be in internal preferences) to avoid getting the occasional black frame in a render because of the occasional video event that somehow ended up to be unquantized.

BTW, unquantized audio event frame edges are not really an issue because audio rendering is not frame based as is the case with video.

@iEmby This isn't about render tho, in both your videos you show the play marker at the start of the event but the preview is black?

The render is correct, it's something to do with the event on the timeline, I can't make this happen despite trying all options I can think of except turning off Quantize to frames, but you show that is turned on,

I am still getting it

even quantize Frames are ON or OFF

@iEmby  At the start of your video you show Quantize to frames to frames On but you can move that event freely on the timeline, ?

@iEmby: Checking 'Enable Quantize to Frames' does not move any events automatically.