A let-down

Mike-D wrote on 5/12/2022, 10:16 AM

After successfully creating a small intro clip in Movie Studio 2022 and finding my way around some of the new ways of working I looked forward to editing a simple fixed-camera video of an hour-long talk with a bit of trimming and a fade-in/out. I began by adding a couple of markers, but after that the sound became out of sync and the video started jumping about. I tried again from scratch by starting a new project, but with the same awful results. I eventually had to use the Video Editor supplied with Windows, which managed the task in its limited fashion. Why am I paying for software that doesn't work?

(PC: AMD Ryzen 3 3100 Quad Core CPU, 6GB AMD RADEON™ RX 5600 XT graphics, with 32GB RAM, running Windows 11 64-bit)

Comments

johnebaker wrote on 5/12/2022, 10:29 AM

@Mike-D

This is a known issue with some formats of video file.

Download and install MediaInfo and analyse the video file and post the results, see this tutorial if you are not familiar with MediaInfo on how to setup MediaInfo and analyse a video clip.

John EB
Forum Moderator

Mike-D wrote on 5/13/2022, 7:41 AM

Here are the results of the MediaInfo analysis:

General
Complete name : H:\Video\monthly meetings\Wimbledon\2022-05-11 14.31.19 Dorking u3a Monthly Talk_ Behind the Scenes at Wimbledon with Alan Chalmers\video1085376909.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/mp42)
File size : 427 MiB
Duration : 1 h 13 min
Overall bit rate mode : Variable
Overall bit rate : 817 kb/s
Encoded date : UTC 2022-05-11 14:54:08
Tagged date : UTC 2022-05-11 14:54:08

Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings : CABAC / 11 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 11 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1 h 13 min
Bit rate : 689 kb/s
Width : 640 pixels
Height : 360 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) : 0.120
Stream size : 360 MiB (84%)
Title : H.264/AVC video
Encoded date : UTC 2022-05-11 14:54:08
Tagged date : UTC 2022-05-11 14:54:08
Codec configuration box : avcC

Audio
ID : 1
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 1 h 13 min
Bit rate mode : Variable
Bit rate : 126 kb/s
Maximum bit rate : 168 kb/s
Channel(s) : 1 channel
Channel layout : C
Sampling rate : 32.0 kHz
Frame rate : 31.250 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 66.0 MiB (15%)
Title : AAC audio
Encoded date : UTC 2022-05-11 14:54:08
Tagged date : UTC 2022-05-11 14:54:08

It was a recording of a Zoom meeting using a Zoom Q8 recorder as a webcam.

CubeAce wrote on 5/13/2022, 8:57 AM

@Mike-D @johnebaker

Hi Mike.

I think the problem lies with the audio stream frame rate which would normally be at 46.785 FPS and not as in your example 31.250 FPS which is a non standard file format for normal video editing. If you try exporting such a file you will see the audio portion frame rate has been changed to 46.785 FPS and the most probable cause of the audio drift.

You may need to convert the file first to a more standard video file format using Handbrake or similar before editing.

Ray.

johnebaker wrote on 5/13/2022, 2:00 PM

@Mike-D, @CubeAce

As @CubeAce has commented the audio samplerate of 32.0 kHz is too low for video - the standard is 48 kHz - and is most likely the cause of the issue, running the video clip through a converter such as Handbrake to get the audio samplerate to 48 kHz should fix the issue.

The audio FPS is calculated from the Samplerate and the number of samples per frame (SPF) - note this frame rate has nothing to do with the video framerate.

John EB