Vegas handles MP4 file OK in V19, but not in VP21 or VP22

cbrillow wrote on 6/21/2025, 7:59 PM

I have an issue where Vegas is decoding and displaying an MP4 file correctly in 19, but not in 21 or 22. (I didn't upgrade to 20)

This anomaly appears in the preview window and is also encoded into rendered files. I've done a screen capture that illustrates the problem, as seen in the following link:

https://drive.google.com/file/d/1ZXnrmzoMmgkPlTR_18_FA2HxDjt7honu/view?usp=sharing

In the video, the same Vegas project is open in all three versions, with the same area looped 3 times and displayed in the preview window. The first set is shown in VP19, the second is VP21 and the third, VP22.

I've looked at a lot of the Preferences, with respect to video devices, and such, and they seem to be the same in all 3 versions. (I didn't compare every setting in every category.)

If anyone has an idea what could be causing this and/or suggestions on how to fix it, I'd appreciate it very much. I'm more than willing to supply more information, if requested.

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Comments

RogerS wrote on 6/24/2025, 12:08 AM

Here's Mediainfo for this new file. For somewhat unusual things I see are 10-bit 420 4:3 ratio video with full color range matched with 132 kb/s mono AAC audio. While all this should work it's an odd combination.

I think VEGAS is reading the pixel aspect ratio wrong (should be 1?)
There seems to be frame corruption around the start of the third section (around frame 2600)
Performance here on my laptop is okay if I pause and let it buffer for a second before playing it. This is with my RTX 4060 laptop, VP 22.250 and legacy AVC off.

General
Complete name : Morgus Presents 03 - Mosquitos 1080HD (v3)-00.06.11.183-00.06.58.735.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 37.7 MiB
Duration : 50 s 819 ms
Overall bit rate mode : Variable
Overall bit rate : 6 222 kb/s
Frame rate : 59.940 FPS
Writing application : Lavf61.7.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High 10@L4.2
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference fra : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 50 s 819 ms
Source duration : 50 s 717 ms
Bit rate : 5 834 kb/s
Maximum bit rate : 7 959 kb/s
Width : 1 440 pixels
Height : 1 080 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 59.940 (59940/1000) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 10 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.063
Stream size : 35.3 MiB (94%)
Source stream size : 36.8 MiB (98%)
Color range : Full
Matrix coefficients : BT.709
mdhd_Duration : 50767
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 50 s 752 ms
Bit rate mode : Variable
Bit rate : 132 kb/s
Channel(s) : 1 channel
Channel layout : M
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 806 KiB (2%)
Default : Yes
Alternate group : 1