VS 2021 Constant Frame Rate Video out of sync Audio

[cybernick]

A CFR file out of VS 2021 played fine. The files specs are bellow. The file is recorded via Riverside video recording service.
But in VS 2021 the audio is out of sync from the begging
Any idea?

Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 1.92 GiB
Duration : 40 min 14 s
Overall bit rate : 6 830 kb/s
Writing application : Lavf58.76.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L4
Format settings : CABAC / 1 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference : 1 frame
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 40 min 14 s
Bit rate : 6 756 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 24.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.136
Stream size : 1.90 GiB (99%)
Writing library : x264 core 157
Encoding settings : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=24 / lookahead_threads=8 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=1 / keyint=250 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=crf / mbtree=1 / crf=18.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 40 min 14 s
Source duration : 40 min 13 s
Source_Duration_LastFrame : -17 ms
Bit rate mode : Constant
Nominal bit rate : 69.8 kb/s
Maximum bit rate : 69.8 kb/s
Channel(s) : 1 channel
Channel layout : C
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Source stream size : 20.1 MiB (1%)
Default : Yes
Alternate group : 1
mdhd_Duration : 2414280

[lata]

What do you mean by “A CFR file out of VS 2021 played fine”
Then say “But in VS 2021 the audio is out of sync from the begging”

Is riverside video recordings a security camera?
We do seem to get reports of problems using security footage with Video Studio

The video fps is using 24fps where the audio is showing 46.8fps, seems odd to have such a difference.

[cybernick]

I mean that the file works in any player besides VS2021.

But in VS2021 preview and timeline the audio is out of sync.

Riverside.fm is a nice tool for video podcasters. The case is that VS2021 does not like the constant frame rate video which supposed to be used in audio sync operation.

In my case as work workaround I used the separate audio and synced manually since the auto sync does not work due to wro long audio wave in video file.

But it is nice observation you had with frame rate of audio. I will inform riverside.fm support team.