Pixelated frames appear in render between events

dxdy wrote on 6/8/2023, 5:24 PM

An old problem popped up in Vegas 20 that I think was solved in Vegas 19.

My Canon XF300 makes a series of 2Gigabyte MXF files during a long shoot. I place them all on the timeline butted up against each other. I render pretty exclusively with Vuokoder making MP4 files.


Occasionally (I know that is not scientific) at the point between two events, a couple of highly pixelated frames are generated FROM AN EVENT SEVERAL EVENTS PRIOR. For example, a pixelated fragment of the third event might appear between events 6 and 7.


In an old thread, someone speculated this might be some kind of a buffer overflow.


My old solution for this was to put one empty frame between frames 6 and 7 in the above example. That usually cured the problem. But then it went away, maybe in version 17 or 18.


Now, to get  a project out the door, I use FFMPEG to concatenate the MXF files into a single file and load one very large file into Vegas 20.

Anyone else having the problem in Vegas 20?

Mediainfo:

General
Complete name                            : C:\Users\fshad\Videos\AA153605.MXF
Format                                   : MXF
Commercial name                          : XDCAM HD422
Format version                           : 1.2
Format profile                           : OP-1a
Format settings                          : Closed / Complete
File size                                : 1.91 GiB
Duration                                 : 5 min 13 s
Overall bit rate                         : 52.2 Mb/s
Encoded date                             : 2022-06-04 14:30:19.000
Writing application                      : CANON XF300 1.00

Video
ID                                       : 2
Format                                   : MPEG Video
Commercial name                          : XDCAM HD422
Format version                           : Version 2
Format profile                           : 4:2:2@High
Format settings                          : CustomMatrix / BVOP
Format settings, BVOP                    : Yes
Format settings, Matrix                  : Custom
Format settings, GOP                     : M=3, N=15
Format settings, wrapping mode           : Frame
Codec ID                                 : 0D01030102046001-0401020201040300
Duration                                 : 5 min 13 s
Bit rate mode                            : Constant
Bit rate                                 : 50.0 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 29.970 (30000/1001) FPS
Standard                                 : Component
Color space                              : YUV
Chroma subsampling                       : 4:2:2
Bit depth                                : 8 bits
Scan type                                : Progressive
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 0.805
Stream size                              : 1.83 GiB (96%)
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Delay_SDTI                               : 17935951

Audio #1
ID                                       : 3
Format                                   : PCM
Format settings                          : Little
Format settings, wrapping mode           : Frame (AES)
Codec ID                                 : 0D01030102060300
Duration                                 : 5 min 13 s
Bit rate mode                            : Constant
Bit rate                                 : 768 kb/s
Channel(s)                               : 1 channel
Sampling rate                            : 48.0 kHz
Frame rate                               : 29.970 FPS (1601.6 SPF)
Bit depth                                : 16 bits
Stream size                              : 28.7 MiB (1%)
Delay_SDTI                               : 17935951
Locked                                   : Yes

Audio #2
ID                                       : 4
Format                                   : PCM
Format settings                          : Little
Format settings, wrapping mode           : Frame (AES)
Codec ID                                 : 0D01030102060300
Duration                                 : 5 min 13 s
Bit rate mode                            : Constant
Bit rate                                 : 768 kb/s
Channel(s)                               : 1 channel
Sampling rate                            : 48.0 kHz
Frame rate                               : 29.970 FPS (1601.6 SPF)
Bit depth                                : 16 bits
Stream size                              : 28.7 MiB (1%)
Delay_SDTI                               : 17935951
Locked                                   : Yes

Other #1
ID                                       : 1-Material
Type                                     : Time code
Format                                   : MXF TC
Frame rate                               : 29.970 (30000/1001) FPS
Time code of first frame                 : 04:58:55;29
Time code of last frame                  : 05:04:09;23
Time code settings                       : Material Package
Time code, stripped                      : Yes

Other #2
ID                                       : 1-Source
Type                                     : Time code
Format                                   : MXF TC
Frame rate                               : 29.970 (30000/1001) FPS
Time code of first frame                 : 04:58:55;29
Time code of last frame                  : 05:04:09;23
Time code settings                       : Source Package
Time code, stripped                      : Yes

Other #3
Type                                     : Time code
Format                                   : SMPTE TC
Muxing mode                              : SDTI
Frame rate                               : 29.970 (30000/1001) FPS
Time code of first frame                 : 04:58:55;29

 

Comments

DMT3 wrote on 6/8/2023, 5:37 PM

Any chance that you have Quantize to Frames disabled?

dxdy wrote on 6/9/2023, 12:55 PM

Thanks DMT3, but QTF is not disabled.

john_dennis wrote on 6/9/2023, 1:42 PM

@dxdy

I would try this:

  • In Shutter Encoder, convert all the MXF files to ProRes 422
  • Replace each MXF file with the Pro Res version.
  • Render

Does the issue remain?

Mindmatter wrote on 6/10/2023, 8:02 AM

Over the years, I encountered all kinds of weirdness in Vegas ( the program😁).
When stuff with this level of strangeness happened, I could usually cure it by diseabling GPU and ram to zero and then restart just before rendering. Not very scientific either but it worked. I haven't seen any of it with V20 so far though.

AMD Ryzen 9 5900X, 12x 3.7 GHz
32 GB DDR4-3200 MHz (2x16GB), Dual-Channel
NVIDIA GeForce RTX 3070, 8GB GDDR6, HDMI, DP, studio drivers
ASUS PRIME B550M-K, AMD B550, AM4, mATX
7.1 (8-chanel) Surround-Sound, Digital Audio, onboard
Samsung 970 EVO Plus 250GB, NVMe M.2 PCIe x4 SSD
be quiet! System Power 9 700W CM, 80+ Bronze, modular
2x WD red 6TB
2x Samsung 2TB SSD

Howard-Vigorita wrote on 6/10/2023, 3:21 PM

@dxdy Thought your description of that old thread sounded familiar:

https://www.vegascreativesoftware.info/us/forum/voukoder-render-has-pixleated-frames-around-some-event-transitions--129720/#ca806494

It's never been fixed in Vegas, far as I know. I think Shutter Encoder now builds ffmpeg and that same script into it's gui. Gluing the clips together before pulling them into Vegas also benefits multicam editing so I've incorporated doing that to all my footage. If you really want to keep the footage segmented, you might try playing with buffer settings in Video Prefs and see if that makes a difference.

mark-y wrote on 6/13/2023, 8:05 PM

Does "Show unquantized frame edges" reveal anything?