This is on a Win11 Pro Alienware R2 M18 laptop, with video coming from a GoPro 12. Graphics show me running normally at 2560x1600. As for what the first mp4 of the 5 in the project is showing me, is the following:

General
Complete name                            : C:\Users\rbrit\OneDrive\Pictures\GX010030.MP4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 1
Codec ID                                 : mp41 (mp41)
File size                                : 453 MiB
Duration                                 : 1 min 3 s
Overall bit rate                         : 60.0 Mb/s
Frame rate                               : 59.940 FPS
Encoded date                             : 2024-07-17 16:28:16 UTC
Tagged date                              : 2024-07-17 16:28:16 UTC

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main@L6@Main
Codec ID                                 : hvc1
Codec ID/Info                            : High Efficiency Video Coding
Duration                                 : 1 min 3 s
Bit rate                                 : 59.7 Mb/s
Width                                    : 5 312 pixels
Height                                   : 2 988 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 59.940 (60000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Bits/(Pixel*Frame)                       : 0.063
Stream size                              : 451 MiB (100%)
Title                                    : GoPro H.265
Language                                 : English
Encoded date                             : 2024-07-17 16:28:16 UTC
Tagged date                              : 2024-07-17 16:28:16 UTC
Color range                              : Full
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Conformance errors                       : 1
 HEVC                                    : Yes
  General compliance                     : Bitstream parsing ran out of data to read before the end of the syntax was reached, most probably the bitstream is malformed (frame 1+[5..6]+[9..10]+[13..14], time 09:28:16.446+[09:28:16.512..09:28:16.529]+[09:28:16.579..09:28:16.596]+[09:28:16.646..09:28:16.663], offset 0x48220+[0xA69FB..0xC2C4B]+[0x118506..0x1351DF]+[0x18E192..0x1AD299])
Codec configuration box                  : hvcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 1 min 3 s
Bit rate mode                            : Constant
Bit rate                                 : 192 kb/s
Nominal bit rate                         : 48.0 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                              : 1.43 MiB (0%)
Title                                    : GoPro AAC
Default                                  : Yes
Alternate group                          : 1
Encoded date                             : 2024-07-17 16:28:16 UTC
Tagged date                              : 2024-07-17 16:28:16 UTC

Other #1
ID                                       : 3
Type                                     : Time code
Format                                   : QuickTime TC
Duration                                 : 1 min 3 s
Bit rate mode                            : Constant
Frame rate                               : 59.940 (60000/1001) FPS
Time code of first frame                 : 09:27:42:23
Time code of last frame                  : 09:28:45:37
Time code, stripped                      : Yes
Title                                    : GoPro TCD
Language                                 : English
Encoded date                             : 2024-07-17 16:28:16 UTC
Tagged date                              : 2024-07-17 16:28:16 UTC

Other #2
ID                                       : 4
Type                                     : meta
Format                                   : gpmd
Codec ID                                 : gpmd
Duration                                 : 1 min 3 s
Bit rate mode                            : Variable
Title                                    : GoPro MET
Language                                 : English
Encoded date                             : 2024-07-17 16:28:16 UTC
Tagged date                              : 2024-07-17 16:28:16 UTC
Duration_LastFrame                       : -752
 

Individual MP4's don't have the problem, only when I try to place them in a project does either issue happen.

@rbritz1970

Hi

Thanks for the MediaInfo data.

What is the CPU model number in the laptop?

Does this speed up and out of sync audio during just timeline playback, or does an export to HEVC video file show the same issue(s)?

John EB

@rbritz1970 Hi, I don't know what 'Bitstream parsing' is apart from what Google tells me, I've never seen that in my GoPro11 videos or any videos to be honest 🤷‍♂️

This is one of mine

Does it matter what order you put the videos on the timeline, ie. is there one video that as soon as you import it it screws all the others up?

I'm running a I9 14500 CPU. As for the two issues, when you create the project and string the 5 videos together, each individual video plays correctly, transitioning to the next video within the project. When you export the project to MP4, and then play it, that is when either issue happens, I am new to the software, so I am expecting I'm doing something wrong. I just don't know why 5 MP4's work separately, but when combined into 1 large MP4, do i have these issues.

@rbritz1970 Hi, I don't know, I just exported a few GoPro11 5312x2988 59.94fps without problem using video as HEVC.

You could share that file/s on Google Drive if you want & we can try them, it'll tell you if we have the same problem?

@rbritz1970 , @Gid

The 'Bitstream parsing' error message would suggest the video stream was closed off incorrectly.

With Gid confirming that he does not get the error message, though from the MediaInfo data posted his camera was upside down (?), this should not make any difference, leads to more questions and testing.

Assuming the video was transferred directly from the camera to PC using Windows File Explorer, ie no GoPro or other 3rd party software was used, I suspect this maybe an 'in camera' issue:-

• Is the memory card, that has been used in the GoPro, one of the brand, type, and speed recommended by GoPro, and can you replicate the same issue using another recommended memory card?
   
• If you run the orginal video files through a video converter, such as Handbrake or Avidemux, 'converting' to HEVC (h.265), do they import/export correctly in Movie Studio?

John EB

@johnebaker Hi, the video I posted MediaInfo of was mounted to he windscreen of my van.

Well I did find something interesting. I took the same 5 MP4 videos, created a new project, and instead of exporting out to MP4 again, I tried the HEVC option and this time the audio works perfectly. So now we have it narrowed down to the MP4 option as being the issue, though digging further is beyond my skill level.

@Gid

Hi

. . . . was mounted to he windscreen of my van . . . .

A good use given the number of crazy drivers on the road. Last Friday saw 4 cars ' race' a red light at a very busy road junction, and the week before a police car, on an emergency, was t-boned at another, again a driver racing a red light.

John EB

@rbritz1970 Your MediaInfo says MP4 HEVC, all GoPro clips are MP4 HEVC, both AVC & HEVC are MP4. Google HEVC vs AVC.

I tried exporting my GoPro clips as AVC to see if that was your problem, the export took quite a while & the result was a garbled mess, this didn't surprise me too much but... , I then exported using the HEVC option & the result was quick & correct.

@johnebaker Yeah I should do it more often, the day I don't will be the day I need it, I need to buy a dashcam one day,

Gid, I guess I'm not following your last post. In your screen capture, that is the option I was using, the MPEG-4 option, and had the audio/video issues. I found a fix by using the HEVC option below the MPEG-4 option, and the issues went away. So I guess I just need to stick with HEVC with the software?

@rbritz1970 Hi, I'm testing something at the moment, but yes stick to HEVC for your clips, you personally won't notice the difference,

This is your MP4 HEVC MediaInfo in the comment earlier

This is what an AVC MP4 would look like

Essentially they are the same, they are both MP4's but one is the old tried & tested AVC that works well with all software, the other is HEVC that is relatively new & some software still struggles a little bit with it.

AVC & HEVC are just ways in which the information from your camera is compressed to fit on a memory card. with cameras now creating bigger images like 4k those file sizes are bigger & so a new compressor was needed, HEVC is the new compressor, there's a lot more to it than that that's why i suggested Googling HEVC vs AVC but basically you're converting one to the other when you use Export - video as MPEG-4

I just exported 3 GoPro clips as MPEG-4, took about 5mins to export 3 clips adding up to a 40sec project.

this was the result, not as bad as one I dud yesterday but still not correct

This is what the orig looks like,

--------------------------------

I exported at HEVC that took less than a minute & the result is correct.

These are those three files if anyone wants to play with them, 573mb but took a few minutes to upload. GoPro11 5.3k 5312x2988 HEVC 8bit files,

Okay I'll stick with HEVC option then. Now to learn how to add a channel logo to the beginning of each project. Thank you all for the help in diagnosing this frustration.