I used to have rendering issues with Mainconcept AVC encoder long time ago in Vegas Pro 12 that I reported to Sony. The Mainconcept encoder in VP11 was not affected so I used to replace VP11 mainconcept encoder dll in VP12 for a while and then I switched to Sony AVC encoder. Never worried about Mainconcept encoder since.
However, when I bough VP15 I found that I cannot use Sony AVC encoder any longer as it does not play nice with 32-bit video levels pixel format. So I decided to to give Magix AVC encoder another try.
I opened my old project from VP12 era where the glitch was extremely visible in VP13 and VP15 and rendered it with Mainconcept/Magix AVC (CPU Only/Mainconcept AVC mode as I have AMD graphics card). The glitch is still there.
I simplified the project and now it has only one media file (m2ts, ~50MB, 1080-50p from Panasonic TM900) and no filters. The project in 8-bits pixel format and render quality set to Best.
I use default Mainconcept/Magix Internet HD 1080p profile and only change framerate from 29.xxx to 25 or 50.
Then in rendered video I have very pixelated frames. Not all of then, only few, but they are very visible as when the file is played some areas looks like they are 'pulsing'. If stopped and watched by frame some frames are extremely wrong.
If I use variable bitrate mode -- the bitrate of resulting video is very low and not matched to specified average bitrate. If I use constant bitrate mode -- the bitrate of resulting video matched the bitrate I specified, but these very pixelated frames are still there.
Mainconcept encoder included in VP13 and VP15 (after changing Internal setting) are also affected. I was not able to check if mainconcept encoder dll from VP11 still do the trick as I do not have VP11 installer any longer and do not know where I can download it.
When I render using Sony AVC or with x264 encoders (using frameserver) and there are no such issue. My hardware & OS completely changed since than.
So, here some details.
Source file media info:
General ID : 1 (0x1) Complete name : J:\Video\VegasMainconceptBug\2012-11-22_095841.m2ts Format : BDAV Format/Info : Blu-ray Video File size : 41.6 MiB Duration : 12 s 950 ms Overall bit rate mode : Variable Overall bit rate : 27.0 Mb/s Maximum Overall bit rate : 28.0 Mb/s Video ID : 4113 (0x1011) Menu ID : 1 (0x1) Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4.2 Format settings : CABAC / 4 Ref Frames Format settings, CABAC : Yes Format settings, RefFrames : 4 frames Format settings, GOP : M=3, N=24 Codec ID : 27 Duration : 12 s 920 ms Bit rate mode : Variable Bit rate : 25.5 Mb/s Maximum bit rate : 26.0 Mb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate : 50.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.246 Stream size : 39.3 MiB (94%) Audio ...
Project settings, Magix AVC CBR, Magix AVC VBR, Sony AVC encoders properties (orange -- name of default profile used, red -- fields that I modified):
Frame1. Look at grass and these red things (Magix CBR, Magix VBR, Sony AVC, x264):
Frame2. Look at face and T-shirt (Magix CBR, Magix VBR, Sony AVC, x264):
Link to zip file with the project & source media and screenshots (~100MB):
Link to zip file with the project, source media, screenshots and rendered medias (~250MB):