Video running too fast and out of sync with audio

sjmackinder wrote on 7/31/2022, 1:14 PM

I am using Magix ProX14 and have created a video file after 2 days of editing. I was having problems with some of the content having serious audio video slippage. Finally managed to create a full 1920x1080P50 file 6.5GB with no issues. Now trying to reduce the video size to send to a client for assessment using the HD file. Whenever I export this now it creates a lower quality file but the audio and video is miles out of sync and everything is far too fast, anyone any ideas please? I have never had this issue before until now.

Comments

sjmackinder wrote on 7/31/2022, 2:01 PM

Update, just ran the low res render on my Win8 machine running ProX7 with no issues at all. Translated a 6.5GB file to 650MB both MP4. I even tried resorting to factory default settings on ProX14 and it still ran riot with the final end result.

CubeAce wrote on 7/31/2022, 5:20 PM

@sjmackinder

That is odd and something I have never encountered.

Have you inadvertently either changed the audio sample rate or frame rate when exporting?

Ray.

sjmackinder wrote on 8/1/2022, 1:30 AM

Initially I tried to export as a lower res file but this had issue with sections being out of sync although only marginally but noticeable. The only way I could get a fully contiguous file was to export as 1920x1080p50 6.5GB and then all was well. Taking this file I then reloaded the mp4 into ProX14 on a fresh start, this is when the export a second time at low res became ridiculous. The video was so fast on playback and the sync was minutes out not just seconds. Yet ProX7 had no problem with the same file.....?

johnebaker wrote on 8/1/2022, 2:36 AM

@sjmackinder

We need more information on the source video files and the export settings you are using to create the 1920 x 1080p FullHD video, and the low res video.

Download and install MediaInfo and analyse one of the source video clips and the exported Full HD video you are re-importing, and post the results, see this tutorial on how to setup MediaInfo and analyse a video clip to get the data in the correct format.

It would also help if you put your computer specification in your profile signature so we do not have to keep asking for it, see this topic for what is required and please quote processor and graphics card make/model in full.

Are the graphics card drivers up to date?

John EB
Forum Moderator

sjmackinder wrote on 8/1/2022, 2:49 AM

I have put all my computer information in my signature as I was asked to do this the last time I used the forum, have I not done this correctly please? The graphics card drivers are all up top date as it is only 3 months old...

emmrecs wrote on 8/1/2022, 3:24 AM

@sjmackinder

Your "signature" details show you as using VPX13, but your question is about VPX 14 so you do need to "update" it!

As for the comment about the GPU drivers being up to date as it is only 3 months old, unfortunately, it is almost certain that they are not if you have not checked the NVidia web site recently! If you have the GeForce Experience app installed (you really should have it) use it to check whether your drivers are fully up to date. Magix now recommends the use of the Game Ready driver rather than the Studio driver and apparently optimise their software for it since they believe that most users will be using that driver.

Jeff
Forum Moderator

sjmackinder wrote on 8/1/2022, 3:31 AM

I dont understand how to use this forum sometimes, this is a cut and paste from my signature:

Main Machine Dell XPS 17 9710 with 2TB SSD drive

Win11, Magix ProX14

Processor   11th Gen Intel(R) Core(TM) i9-11900H @ 2.50GHz 2.50 GHz
Installed RAM   32.0 GB (31.7 GB usable)
System type   64-bit operating system, x64-based processor
Pen and touch   Touch support with 10 touch points

GPU Nvidia GeForce RTX3600

emmrecs wrote on 8/1/2022, 4:16 AM

@sjmackinder

Thank you for the update! When I checked your signature before I posted last time it still said you were running VPX13, so not sure why?

However, have you also checked about your GPU drivers?

Jeff

sjmackinder wrote on 8/1/2022, 4:36 AM

The thing is I have never owned VPX13 which is strange as my only other version is VPX7 which still runs on my Win8 Dell. Yes I have been onto the Nvidia WEB site and downloaded up to date drivers. My original version was at 30.0.15.1272. After downloading the latest I now have 31.0.15.1659 so quite a difference. I will have a go at rendering the file again. Thank you for your advice, I will let you know how this works out.

emmrecs wrote on 8/1/2022, 5:12 AM

@sjmackinder

Excellent news on the driver updates!

Do let us know whether this (quite significant) update goes any way towards resolving the issue.

I see the numbers you quote are those shown by Windows Device Manager. Do you have the NVidia GeForce app installed? It automatically checks for updated drivers and notifies the user of their release and offers to download and install them.

Jeff

sjmackinder wrote on 8/1/2022, 5:20 AM

Yes I installed the experience app at the same time so hopefully this will do as you say. Many thanks, Simon

sjmackinder wrote on 8/1/2022, 5:43 AM

I have just re run the edit and the result is the same. During the edit it states that no hardware encoding is being used yet when I ran the full HD compiler this used hardware although using the early Nvidia drivers it was rapid and perfect with no sync issues. I am trying to drop the 6.25GB 1080p50 file down to 768x432 16:9 but encounter the issue.

sjmackinder wrote on 8/1/2022, 5:53 AM

I have managed to get the compiler to use graphics hardware but the end result is still the same. The audio plays at normal speed but the video is racing ahead getting more and more out of sync throughout. The odd thing is that prior to export the video and audio is in perfect sync in the edit window throughout. It is as though the export compiler is applying a different frame rate to the audio compared to the video...?

CubeAce wrote on 8/1/2022, 7:04 AM

@sjmackinder

Hi Simon.

Earlier @johnebaker asked you to get MediaInfo data from the files you are using.

I think this must be your next step as I don't think at this point it is a hardware issue.

Ray.

sjmackinder wrote on 8/1/2022, 7:36 AM

The point is that the HD file was created by ProX14 originally but somehow it cannot render this file down to an alternative format in a lower resolution....

CubeAce wrote on 8/1/2022, 8:18 AM

@sjmackinder

Hi Simon.

That just makes it more curious and begs of possible backward compatibility issues. If the file is too low res to begin with, that may be partially the problem or maybe an audio codec change?

We do try not to make unnecessary requests if we don't think something is not relevant.

Ray.

sjmackinder wrote on 8/1/2022, 8:24 AM

General
Complete name : H:\Event Videos\Windsor Castle 27th July 2022\Final 1st edition edit in HD.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/avc1)
File size : 5.98 GiB
Duration : 33 min 18 s
Overall bit rate mode : Variable
Overall bit rate : 25.7 Mb/s
Encoded date : UTC 2022-07-31 16:11:40
Tagged date : UTC 2022-07-31 16:11:40

Video
ID : 1
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
Format settings, GOP : M=3, N=50
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 33 min 18 s
Bit rate : 25.5 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
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 : 5.94 GiB (99%)
Language : English
Encoded date : UTC 2022-07-31 16:11:40
Tagged date : UTC 2022-07-31 16:11:40
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 33 min 18 s
Bit rate mode : Variable
Bit rate : 164 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 : 39.0 MiB (1%)
Language : English
Encoded date : UTC 2022-07-31 16:11:40
Tagged date : UTC 2022-07-31 16:11:40

CubeAce wrote on 8/1/2022, 9:17 AM

@sjmackinder

Hi Simon.

There doesn't seem to be anything amiss with the data on the file.

The only other thing I can think of that has presented some other users in the past with audio problems is the audio settings in Windows.

While it doesn't seem to matter what sampling or bit rate the speaker output is, it is safer to limit all inputs to 24 bit 48kHz.

If that doesn't fix the problem then I personally have no clue as to what to advise next as it should be working.

Ray.

sjmackinder wrote on 8/1/2022, 9:45 AM

Oh well there is one other solution which is a silly one. Use VPX7 which will will work fine with the file to produce a lower quality render mp4 for client assessment. Definitely a step backwards Magix!

emmrecs wrote on 8/1/2022, 9:47 AM

@sjmackinder

Thanks for the additional information again!

Just for the sake of comparison can you also post the MediaInfo data on the exported (faulty) file?

Also, (I don't think we've asked for this before); can you show a screenshot of the settings of the Export screen you are using to create your lower resolution file?

Jeff

sjmackinder wrote on 8/1/2022, 9:57 AM

General
Complete name : C:\Users\SJMAC\OneDrive\Desktop\SD.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/avc1)
File size : 652 MiB
Duration : 33 min 18 s
Overall bit rate mode : Variable
Overall bit rate : 2 736 kb/s
Encoded date : UTC 2022-07-31 18:21:53
Tagged date : UTC 2022-07-31 18:21:53

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings : CABAC / 2 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 2 frames
Format settings, GOP : M=2, N=25
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 33 min 18 s
Bit rate mode : Variable
Bit rate : 2 600 kb/s
Maximum bit rate : 3 600 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.050
Stream size : 620 MiB (95%)
Language : English
Encoded date : UTC 2022-07-31 18:21:53
Tagged date : UTC 2022-07-31 18:21:53
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 33 min 18 s
Source duration : 33 min 18 s
Bit rate mode : Variable
Bit rate : 132 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 31.3 MiB (5%)
Source stream size : 31.3 MiB (5%)
Language : English
Encoded date : UTC 2022-07-31 18:21:53
Tagged date : UTC 2022-07-31 18:21:53

sjmackinder wrote on 8/1/2022, 10:01 AM

sorry I dont know how to provide a screen shot on this forum, it is not obvious...

CubeAce wrote on 8/1/2022, 10:17 AM

@sjmackinder

Hi Use the blue circle icon above when you open a reply text box with the upward arrow in it.

Ray.

sjmackinder wrote on 8/1/2022, 10:20 AM

Aha, thank you, I will probably forget this again next time I post, thank you