3 Blank frames when splitting a vid to insert another

Bria wrote on 6/17/2025, 9:31 AM

I've got a long video, at points I split it, move the tail down a bit, insert another video after the head and then move the tail back to start after the inserted video.

Often, cannot be sure all the time, the last 3 frames of the inserted video are black/blank, they were not before, there is no problem with the audio.

In one case, it was more than 3, 7, I think, but that case may just be different.

This is on the timeline, so pre-render, but it's visible after render.

Any ideas as to what's going on?

 

Thanks

Comments

john_dennis wrote on 6/17/2025, 9:56 AM

Please state

  • Vegas Pro version
  • Width and Height from Project Properties
  • Width and Height of the Media on the timeline
  • Screenshot of Options/Quantize to Frames settings
Bria wrote on 6/17/2025, 11:11 AM

Sorry:

22

1920*1080

"Width and Height of the Media on the timeline" Not sure about but I think you mean this, I've added more:

Long vid:

Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4.2
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 10 min 7 s
Bit rate                                 : 1 329 kb/s
Nominal bit rate                         : 2 500 kb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 60.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.011

 

Second video inserted vid

Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L3
Format settings                          : CABAC / 3 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 3 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 5 s 542 ms
Bit rate                                 : 403 kb/s
Nominal bit rate                         : 500 kb/s
Width                                    : 854 pixels
Height                                   : 476 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 24.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.041
Stream size                              : 273 KiB (98%)

 

I insert the second video as a Vegas project; however, as I changed the way I do things, I delete the audio and then add it back below the audio of the first/main video. Originally, I split both the video and audio of the main video and dropped the second in.

 

 

john_dennis wrote on 6/17/2025, 12:07 PM

Sorry, my coffee consumption is below standard this morning. For discontinuity of cuts, we should be more interested in frame rate differences from the Project Frame Rate and/or the various media frame rates on the timeline.

  • Please state the Project Frame Rate.
  • Turn On Show Unquantized Event Edges (You'll see red lines where events don't align.)
  • Make sure Enable Snapping is turned On
  • Check and Uncheck the other Snap Options to determine if you are snapping to something unexpected.

I see that you have media of different frame rates on the timeline. There is a potential for discontinuity as a matter of course. Always Show Unquantized Event Edges to catch them.

Bria wrote on 6/18/2025, 11:13 PM

Project Frame Rate: Custom (1920x1080, 59.940 fps)

Turned on Show Unquantized Event Edges and lots of red lines.

It's odd that, except for tracks 108 and 109, the audio tracks, I don’t have any red lines after track 88 @ 3:27 in a 20-minute video, but I have edited no further than 13:08 so far. Just noticed there is one red line at the end of the video track 107.

This is my first major Vega project, so I may have adjusted my approach as I go along.

I have definitely had the 3 blank frames problem after 3:27, but have fixed them by deleting them and moving the tail up to the head. 'Politely' ignoring the audio, which has nothing missing, as you can't really hear. All the same, it's far from ideal and always breaks up the workflow badly.

 

I was unsure what you meant about the sapping bit, so I turned off the 3 options after 'Enable Snapping', but had to turn 'Snap to All Events' back on as I really use that.

 

I'm puzzled about what you mean by 'Align', if you look at Red2, there is nothing to align with. Could you please explain what you mean by align.

 

Thanks

 

Bria wrote on 6/19/2025, 8:10 AM

Are, I think I've got it, but got to go to bed.

john_dennis wrote on 6/19/2025, 10:14 AM

@Bria asked: "I'm puzzled about what you mean by 'Align', if you look at Red2, there is nothing to align with. Could you please explain what you mean by align."

At 35,000 ft, by "align" I mean that the leading edge and the trailing edge of a video event aligns with a frame based on the Project Frame Rate. As you move along the timeline, the cursor lands discretely on a frame boundary. With mixed frame rates for different media (You have Frame rate: 60.000 FPS and Frame rate: 24.000 FPS from your Mediainfo report above), you will inevitably have misalignment as indicated by the red lines. Just to add insult to injury, you chose a Project Frame Rate that didn't match either of your source media frame rates.

Why not pick a Project Frame Rate that matches the preponderance of your media like the whole integer Frame rate: 60.000 FPS?

Big Note

Life is a lot simpler if you pick the best frame rate before you start editing.

Bria wrote on 6/24/2025, 12:56 AM

Yeah, I found https://www.vegascreativesoftware.info/us/forum/vegas-21-build-314-getting-black-frames-in-between-clips--145739/, but you put it much more equivalently and certainly better than I could, even after a good night's sleep.

The thing to note is that I'm European, so 25fps and I don't believe in high frame rates, just a numbers game to sell me more junk. However, I did want a high frame rate for this project for a specific reason, but I made a mistake and ended up with 60fps when I wanted 50fps. When it came time to hit Vegas, I'm new, it looked to offer all the standard fps, I was a bit puzzled by 59.940 fps, but assumed that Vegas was just been up itself by not rounding up to 60, like everyone else must do as Vegas seemed to be displaying a list of all the common frame rates. As I said, 60/59.94 is outside of my experience, I'm clueless, not psychotic :)

Now I've found out you can type 60 in, why does Vegas not offer this in the drop-down!

Having set the project to 60fps, lots of red, I fixed it, but it made no difference, possibly made my 24fps problem worse. So I ran it through OBS at 60fps, and the problems seem to be sorted.

I just checked to see if Vegas can record, and it can do the screen, so I could have used it instead of OBS I assume. But the big question is, if Vegas can playback and record, why does it not offer fps conversion as an option? In fact, it could ask me what I want to do when I drop a different fps on the timeline, it does not even need to display it in reality and should be able to do it all computationally.

Cheers for the red stuff, it's taught me 'hyper zooming', very, very useful, particularly for key frames.