A few things.

1st: The link you have for tutorial is longer good as it says the item is no longer there.

2nd: Do you want the info on the finished exported product of the video it self or the footage used in it.

3rd: Am I supposed to use handbrake before I start editing it in video pro or after the video is exported?

@jjgrober

Hi

Thanks for the heads up on the link - it is now working.

Analyse the video footage imported (added) into the project.

Conversion should be done before importing (adding) the video to the project.

HTH

John EB

Here is the info for the current video I'm working on. I guess my only question is what would of changed for me to have to encode it before editing when I didn't have any issues at all earlier?

General
Complete name                            : D:\FS 22 Recordings\elm creek 23.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 23.9 GiB
Duration                                 : 56 min 37 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 60.3 Mb/s
Writing application                      : Lavf58.76.100

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4.2
Format settings                          : CABAC / 2 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 2 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 56 min 37 s
Source duration                          : 56 min 37 s
Bit rate mode                            : Constant
Bit rate                                 : 60.0 Mb/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)                       : 0.482
Stream size                              : 22.8 GiB (95%)
Source stream size                       : 23.7 GiB (99%)
Color range                              : Full
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
mdhd_Duration                            : 3397433
Codec configuration box                  : avcC

Audio #1
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 56 min 37 s
Bit rate mode                            : Variable
Bit rate                                 : 37.3 kb/s
Maximum bit rate                         : 320 kb/s / 320 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 15.1 MiB (0%)
Title                                    : Mic
Default                                  : Yes
Alternate group                          : 1

Audio #2
ID                                       : 3
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 56 min 37 s
Bit rate mode                            : Variable
Bit rate                                 : 288 kb/s
Maximum bit rate                         : 320 kb/s / 320 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 117 MiB (0%)
Title                                    : Game capture
Default                                  : No
Alternate group                          : 1
 

@jjgrober

Hi

. . . .  my only question is what would of changed for me to have to encode it before editing when I didn't have any issues at all earlier . . . .

Did anything change between not drifting and drifting audio?

On the basis that the MediaInfo analysis is of the original recording, that is a good question. From the MediaInfo analysis the video would appear to be OK.

Was the recording captured using OBS?

The video using Constant Bit Rate (CBR) is not one that would normally be used. Variable Bit Rate (VBR) is preferred as this allows the decoder to adapt the the rate depending on the scene contents eg low detail gets lower bits/sec, and high detail gets more bits/sec.

The 2 audio streams should also not cause an issue as Video Pro X can import use both streams.

Try the following:

1. In the project using the original recording - right click the video file and select Create (new) frame table  then export again to see if the audio drifts.
   
   If that does not work
    
2. Re-encode the video file to h.264 encoded video and AAC Stereo encoded audio (this will combine the 2 audio streams into one) and in a new project export this to see if the audio drifts.

John EB

@jjgrober @johnebaker

Hi.

In addition to Johns observations.

It is also possible to further split multiple audio tracks into either separate mono tracks or stereo pairs for further audio mix-downs by right clicking the audio track or combined audio video track if that is how you imported it although whether that would be any help in keeping the audio in sync on export I have no idea. It would give you greater audio control over individual track volumes though.

What I do notice is the two stereo audio channels do not match bit rates for audio quality with your commentary mic set to a lower quality. In theory it should make no difference but in practice I'm not sure.

If it is possible I would up the bit rate of the mic channel to match the game play audio to be on the safe side.

Ray.

@johnebaker @CubeAce

John,

I've tried both of those and I am still getting the same results.

CubeAce,

I find it weird that the file shows it as that just because I went and double checked my settings and I have the same rating set for both audios.

Also I don't know if this will help or if I didn't explain it well enough but when the audio drifts and such in the video, it does at some point come back into sync and the footage will basically replay a certain 10-12 seconds of footage again but with the sound in sync right at the end of the 2 minute mark.

Also just wanted to add that when I slow it back to normal speed it basically over shoots the moment where I have it slowed down in the editing software so basically it extends a 10-12 seconds longer

Hopefully this explains more or it expands on the issue a little better

@jjgrober

Hi.

A couple of questions.

Which version of VPX are you using? I'm asking in case this could be a possible bug we haven't seen before.

If it is VPX 13 what are your program settings on the processing options set to for Import \ Processing \ and Export?

What is creating your video files? It's not a camera is it. It looks like it has been generated \ recorded from a software application. I'm wondering if there are enough reference frames within the file to keep audio in sync with the video content if altered in any way.

Have all previous projects used files form the same sources?

Sorry for my thought meanderings but sometimes my thoughts and questions seem to spark off a though process in John's head that then leads to an answer.

Ray.

@jjgrober, @CubeAce

There should be no issue with the 2 audio streams, they have the same sample rate of 48kHz,and the bitrate is set to variable, as it should be.

I would assume the difference in average bitrate is due to less actual audio in the stream 1.

John EB

@CubeAce

The version I am on right now is 19.0.2.150. I was thinking it was maybe that it was the version causing the issues but didn't want to jump to that conclusion right away. I also have tried uninstalling and reinstalling and still the same results.

For project settings I have been using the HDTV movie settings so FullHD 1080p with 60 FPS. The file being imported is mp4.

The software I have been using to capture everything is OBS and the only setting I've changed recently is I downgrade the bitrate and changed from 2 audio channels to one. The third channel was for a separate project that I'm no longer doing but I never had any issues with that in the beginning.

When I export the video I have been using 2560x1440 60 fps and using the CPU to encode it. The upscale is because of you tube's side of file processing makes it all pixelated just because my channel is too small yet to warrant them processing it as HD so upscaling bypasses that. The bitrate I've been running is 25,000 for max and 20,000 average with a CPB at 8,000. Coding quality high and the kBit/s at 192. I have not changed any of these from the other videos and done it this way since with no issues till now.

Also as additional information it seems this is only happening with the speed up affect. I have edited other videos and those never had the speed up affect in them and had no issues that I am now.

@jjgrober

Hi.

In OBS Studio. Try increasing the KeyFrame Interval to the same amount as you are recording frames per second. That should help with keeping the audio in sync when editing and double your present amount of key frames.

Ray.

This first video is showing what I mean by it doubling back and then getting back in sync.

This the second showing what I mean by it being off. Basically when I pull away it doesn't start the normal speed till after the point when it should of started at. It should of started when I'm unloading which is where I have it set up when I edited the video originally.

@jjgrober

I just tried this for myself using one of my own files I know is good. I had the same results as yourself.

However, right clicking on the speed altered video after applying the speed differences and then selecting 'Create new frame table' and then saving the project resolved the problem for me.

Ray.

@CubeAce

I tired that the other night and it still did it but I'll give it another try here tonight and let you guys know. It doesn't show any confirmation when clicking that does it?

@CubeAce

So i tried it again and i'm still getting the same results. I'm not sure why its working like this but it is yet. I might try starting completely over and seeing if that makes a different but I'm thinking it won't. I did create the new table first saved it and than reopened it if you were wondering.

@jjgrober

Hi.

I have not given up trying to help you yet.

So far we have established that there is a problem with MEP when it comes to keeping and audio track or tracks in sync when altering the speed of a clip more than once but that can be resolved by creating a new frame table.

There are warnings on the product specs page that MEP or VPX can only handle standard versions of video codecs and OBS Studio files set to their default settings are anything but standard in their encoding. There are similar warnings on other video editing application websites so this is a general problem and not just a Magix based one.

There are lots of variables within the OBS Studio screen recorder that stray from the type of MP4 file you would get from a Camcorder or DSLR so my guess would be there is more tweaking to be done within the settings of OBS to make this work and produce files closer to a base normal codec wrapper.

That includes how it encodes the audio as well as the video frames.

I will go away for some hours and see if I can find some OBS settings that work better with an LNE.

Ray.

@CubeAce

@johnebaker

No I understand that. I appreciate all the help that both of you are providing and fix it. It's just weird to me that after it's been fine all this time that I am now just starting to have issues. I keep trying to troubleshoot solutions myself but I thought I try here to see if it was just something simple that I am overlooking.

The only other difference as well is OBS did an update around the same time as well as Video Pro. So that may be fighting each other, but like I said the only time I'm having audio issues is when coming out of the speed up effect which is weird as well. All the other videos I have edited without that effect are fine and no issues with the audio drift. When I get off work today I'm going to try doing it as a completely new project and see if that changes anything (which I know it's probably not but we never know).

I'll keep you guys posted on if that works or not.

Thanks again in advanced.

@jjgrober

Hi.

I'm going to call this in as a possible bug with VPX and MEP 2022.

I have now tested with various OBS settings and with my own camcorder files which should be OK and the problem persists. I even tried with other file types. Both playback and exports can be random as to whether they work or not. See below.

Hi Guys

Please play all of the video to see how random the behaviour is and please check this out on your own systems. Also it only seems to happen if a video is sped up and then later returned back to a normal or below playback speed.

@johnebaker @emmrecs @AAProds @Reyfox @browj2 @Scenestealer

Ray.

@jjgrober

Hi

Taking some steps back -

. . . .  I have been using the speed up effect and it goes a little bit longer than it should be from where I have originally edited it in the video and then towards the end of the video it will somewhat repeat some part of the footage and gets back how it should be. . . . .

Is this one long recording and you are adding the speed effect in part of it with no cuts?

What speed factor setting are you using?

In the Youtube clip, in your first post, between 17:38 and 29.38 is there supposed to be sounds of the tractor and pickup truck ?

Same for the second and third clips for the majority of the clip I hear nothing other then what sounds like the occasional click of key(s) on the keyboard and occasional very short bursts of about 5 frames (1/5 sec) of tractor noise - I downloaded both of these to check and as you can see from the images below there is very little audio - these have been normalised to get it as loud as possible for the waveform display.

Can you post a screen shot of the timeline region about 2 minutes before and after 28:30 where the audio is out of sync - make the timeline pane full screen, to grab the shot, and zoom in both horizontally and vertically.

John EB

@johnebaker

So when I do the videos I end up taking the sound out during the sped up parts of the video and add music instead to form a time laspe. I figure it would be less of a load when I do it that way instead of muting the sound from the game and everything. I also do cuts between the sections of where I speed it up and bring it back to normal. It will be quite a few hours before I can get the other information that you have requested but I figured this will offer some insight in the meantime.

I do not know if I still have that one I might have to use the current one as I think I did some hard drive cleaning and might of gotten rid of that footage if it works out.

@johnebaker 

Please let me know if this is what you're looking for. This is the video I uploaded earlier showing the issues.

Also I use the 4x speed factor.

@jjgrober @johnebaker

Hi.

I have been communicating with John and showing him additional problems that I feel are related and maybe causing your problems as well when using the speed change effect. Files somewhere are not being recorded or saved correctly during the process or upon shutdown of a project.

When you play these next two videos please make sure your sound is turned down.

When the project is re-opened.

The saved sound file

I have tried increasing both audio buffers and sampling rates. Doesn't make any difference at my end.

Ray.