@Matt-Braun

Hi

In addition to @Former users comment.

A quick check you can do is to analyse the source video clip with MediaInfo and if you see either:

1. in the Video section:
   
   Framerate mode: Variable
   
   or
    
2. in the Audio section
   
   Sampling rate is not 44.1kHz or 48Khz

The video needs converting to Constant framerate and/or the audio sample rate converting to 44.1 or (preferably) 48kHz. with a video converter such as Handbrake or AviDemux

HTH

John EB
Forum Moderator

Thank you @Former user and @johnebaker, updated my signature.

Please find the MediaInfo below; I don't have variable frame rate or a sampling rate other than 44.1kHz or 48Khz

General
Complete name                            : X:\[] MY CLIPS\commentary 2.MP4
Format                                   : XAVC
Codec ID                                 : XAVC (XAVC/mp42/iso2)
File size                                : 1.75 GiB
Duration                                 : 4 min 50 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 51.7 Mb/s
Encoded date                             : UTC 2022-08-15 07:16:12
Tagged date                              : UTC 2022-08-15 07:16:12

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                                 : 4 min 50 s
Bit rate mode                            : Variable
Bit rate                                 : 49.7 Mb/s
Maximum 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                               : 50.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.479
Stream size                              : 1.68 GiB (96%)
Encoded date                             : UTC 2022-08-15 07:16:12
Tagged date                              : UTC 2022-08-15 07:16:12
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : xvYCC
Matrix coefficients                      : BT.709
Metas                                    : 3
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : PCM
Format settings                          : Big / Signed
Codec ID                                 : twos
Duration                                 : 4 min 50 s
Bit rate mode                            : Constant
Bit rate                                 : 1 536 kb/s
Channel(s)                               : 2 channels
Sampling rate                            : 48.0 kHz
Bit depth                                : 16 bits
Stream size                              : 53.2 MiB (3%)
Encoded date                             : UTC 2022-08-15 07:16:12
Tagged date                              : UTC 2022-08-15 07:16:12

@Matt-Braun

Hi Matt.

@johnebaker sent me one of his :XAVC files so I could try it out for comparative performance between his system and mine. (My system being less powerful and older than his own).

I did not have any problems playing his file which is 4K not HD.

So it is not a problem with VPX.

I do notice however that the file needs to be on a fast drive preferably not on the C: drive.

My graphics card is an nvidia 1650 Super. You can see the rest of my computer specs in my + SIGNATURE below to see the rest including the current drivers for my graphics processing units.

Please compare them to your own system specs. Better still post them here for us to assess.

Also make sure you have set the audio within VPX to use the wav driver and that you are running the latest drivers for your GPU.

Ray.

If I trim a clip there will be a distinct crack sound added to the very end of the clip at times.

I have had the same (a distinctive "Zit"), over the years, randomly and seldomly. I just trim a few more frames off the end and it disappears.

@CubeAce

I did not have any problems playing his file which is 4K not HD.

Ray, UHD actually. 😉😂

@AAProds

😛🤣

Hi Al.

While I confess to never having dealt with file containers other than MP4 or Mov for the majority of my editing I have never had to trim frames from any file including those uploaded to the forums for us to test if they have loaded into the programs. The programs themselves should be removing frames automatically on an edit if required to allow GOP alignment if needed for exporting. As far as I know that also would only effect the programs ability to use 'Smart Copy'.

Ray.

@Matt-Braun

Hi

I can see nothing wrong with the video it looks like this is from a Sony or Panasonic camera.

If Alwyns @AAProds suggestion does not fix the issue, try increasing the audio buffer size in VPX - these are the settings I use

Your settings dialog will look slightly different the above is from VPX 14.

Do you have any of the 'All-in-one' codec packs installed eg K-Lite, if so they could be interfering with the codecs used by VPX, and are not necessary for video editing.

@AAProds

Hi Alwyn

. . . . Ray, UHD actually . . . .

To be precise it is 4K UHD or, as you have seen in another post UHD TV (bad name). The naming of 4K and 8K is sloppy as the definitions are an ' approximate' 4000 or 8000 px width. 😒

John EB

@Matt-Braun

Matt, could you put one of your "crack sound" videos files on Google Drive for us to look at? As large as you like.

@Matt-Braun @johnebaker @AAProds @Former user

While I concur with Johns audio buffer / sampling settings be aware this will use more motherboard system ram and the more individual tracks laid down within a project, the longer the delay will become between say pressing a play button and that command being carried out. It will also alter the latency of response to adjusting any alterations to the mixer controls in playback mode. The result will also be system dependent so the result possibly won't be the same as John's.

I always personally try increasing the sampling first (Multitrack and preview size) rather than the buffer numbers to reduce that possible latency. However I would not go beyond 16384 samples before adding one additional buffer at one time or my premise falls apart. Again the result could be system dependent.

I don't know if anyone has made the connection but the resolution of a 4K video is roughly the same as a good quality, not too compressed 4MP jpeg, 8K = to 8MP, and so on although the compression used gives a different 'look' to the image.

I also notice the decoding of an XAVC file is greater than when dealing with MP-4 during playback..

[edit]

Please note the replies here are based upon members personal experiences and preferences.

Ray.

@CubeAce

Hi Ray

. . . . I don't know if anyone has made the connection but the resolution of a 4K video is roughly the same as a good quality, not too compressed 4MP jpeg, 8K = to 8MP, and so on . . . .

Unless my maths deceive me 4K UHD is approx 8 Mp, 8K is approx 33Mp equivalents for still images.

. . . . although the compression used gives a different 'look' to the image. . . .

I believe the difference in look is due to the colour space transfer characteristics ie Gamma curve applied to the sensor data when encoding.

IIRC JPEG has a low level gamma curve applied when encoding and decoding is 'colour perfect'.

BT 709 has a non linear gamma for encoding, the decoding characteristics decoding has to reverse this however it is not an exact match.

. . . . I also notice the decoding of an XAVC file is greater than when dealing with MP-4 during playback . . . .

Are you comparing videos of the same Level (5.1) and resolution?

John EB

@johnebaker

Oops. I don't think I have woken up yet John.

My maths just went out of the window up-scaling from HD

2 MP = 1600 x 12002 Megapixel (forgot to times four 😳)

Are you comparing videos of the same Level (5.1) and resolution?

Compared to the file you sent me? I think so, yes. Possibly higher with the exclusion of the audio codec in use.

General
Complete name                            : H:\Christmas Dickens Festival 2019\100MEDIA\DJI_0161.MP4
Format                                   : MPEG-4
Format profile                           : JVT
Codec ID                                 : avc1 (avc1/isom)
File size                                : 146 MiB
Duration                                 : 12 s 120 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 101 Mb/s
Encoded date                             : UTC 2019-12-08 15:01:53
Tagged date                              : UTC 2019-12-08 15:01:53
Comment                                  : DE=D-CLike, Type=Normal, HQ=Normal, Mode=P
gpt                                      : +2.40
gyw                                      : -28.30
grl                                      : +0.00

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L5.2
Format settings                          : CABAC / 1 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 1 frame
Format settings, GOP                     : M=1, N=30
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 12 s 120 ms
Bit rate mode                            : Variable
Bit rate                                 : 100.0 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 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)                       : 0.241
Stream size                              : 145 MiB (100%)
Title                                    : DJI.AVC
Language                                 : English
Encoded date                             : UTC 2019-12-08 15:01:53
Tagged date                              : UTC 2019-12-08 15:01:53
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                                 : 12 s 117 ms
Bit rate mode                            : Constant
Bit rate                                 : 192 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                              : 280 KiB (0%)
Title                                    : DJI.AAC
Language                                 : English
Encoded date                             : UTC 2019-12-08 15:01:53
Tagged date                              : UTC 2019-12-08 15:01:53

Other
Type                                     : meta
Duration                                 : 1 s 0 ms
Bit rate mode                            : Constant
Default                                  : No

I should also mention I am using the same version of VPX as @Matt-Braun

Ray.

Thank you all for your feedback so far.

Please note that this isn't a playback issue as such - the crackling sound also is present in the exported video! Therefore I don't understand what buffer sizes and such would change?

Also, if the file I'm using plays without crack sounds in any media player I have but doesn't in VPX then it IS a problem of VPX.

Yes, the file is directly from a Sony a6100.

@AAProds I've had added a sample with my original post.

So it is not a problem with VPX.

I do notice however that the file needs to be on a fast drive preferably not on the C: drive.

Because some other XAVC file works on your system? How do you come to that conclusion?

Wouldn't that be a playback issue? The crackling sound is also present in export.

Please compare them to your own system specs. Better still post them here for us to assess.

I've added them to my signature after the first reply suggested that.

I can see nothing wrong with the video it looks like this is from a Sony or Panasonic camera.

Correct: Sony a6100

If Alwyns @AAProds suggestion does not fix the issue, try increasing the audio buffer size in VPX - these are the settings I use

Those seem to be the default settings as mine are the same and i never touched them.

Do you have any of the 'All-in-one' codec packs installed eg K-Lite, if so they could be interfering with the codecs used by VPX, and are not necessary for video editing.

Nope, no codec packs installed.

@Matt-Braun

I've had added a sample with my original post.

Matt, I believe Magix recodes any videos posted on the forum, as Youtube does, so I think the clicks will be baked in to your posted video, which means we can't check it on our machines.

@Matt-Braun Hi, there's no sample file on your orig post, just a video directly uploaded to this forum, that's no good because it's gets altered when uploaded on here,

When @AAProds asked for a sample it needs to be the orig unedited file straight from the camera, Open Google, top right there's a square of dots - Google Drive, drag the file on that window, once it's uploaded right click - Share, there's an option at the bottom of the pop-up window to - Share wit anyone who has this link, Copy, then on here use the chain button at the top of a new comment to share that link,

PS put it in a new comment, nobody like scrolling back up to the top to work out what's been changed or added,

I've had & seen other posts in Vegas where 'noise' is on the later part of a clip, when I get it reloading the clip makes it goes away, but sometimes it doesn't & sometimes it goes away for no apparent reason, some have suggested partial end frames, MP3 or XAVC formats but nobody has come up with a solid solution & there doesn't tend to be many replies on posts like that, so either they don't know or they don't want to know 🤷‍♂️

This is one of mine i posted a while back, the lines make tick noise like in your video

@Matt-Braun Hi, I'm glad you've found a solution, making a sample file to upload would've defeated the object, it would've been no better than the one you posted in your first comment because the orig file would've been altered, no worries tho if moving to that other drive has made it work right without noise, 👍

@Matt-Braun

Hi Matt.

Video editors have to load everything to ram in 'chunks of data' so as to keep the audio and video frames in sync. You can test that by using the scroll lever and slowly move the cursor across the timeline. Listen to the audio. It is repeated until it gets to the next 'chunk' of data. If that data can't then be dumped and the next 'chunk' loaded in time then you get those types of thumps in the audio. Sometimes it can be remedied by increasing the audio buffers or sample rates so more data is loaded at a time but sometimes the drive the files sit on cannot supply the data fast enough or enough data in one burst to supply the data in time. SSDs can be bad at this as they do not handle large files well. The larger the file, the relatively slower the files get delivered. Ideally a slower SATA hard drive but with a very large cache memory is much better to use for video editing. If you are on a laptop it also needs to be able to use USB 3 fully.

It is possible to upload large files of any type onto Google drive for others to download without them being altered.

Ray.

@Matt-Braun

Hi

. . . .  it turns out @CubeAce was onto something with the fast drive. I threw the file in question onto C drive which is a m.2 SSD (and the only fast drive I have) and the problem was gone . . . .

Try loading the file from its old location into a new project - if it crackles, close VPX and using Windows File Explorer browse to the folder where the file is and delete the two files which have the same name as the video clip and file extensions ending in .HDP and .H0

Start VPX and load the file again - does it crackle?

John EB