<p>I record an MP4 video with IPEVO document camera. There is no out of sync problem. Here is the metadata of the MP4 video (as the media source).</p>
<pre><code>General
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (mp41/isom)
File size                                : 499 MiB
Duration                                 : 8 min 50 s
Overall bit rate                         : 7 897 kb/s


Video
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Baseline@L3.1
Format settings                          : 4 Ref Frames
Format settings, CABAC                   : No
Format settings, Reference frames        : 4 frames
Format settings, GOP                     : M=1, N=15
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 8 min 50 s
Bit rate                                 : 7 717 kb/s
Width                                    : 1 024 pixels
Height                                   : 768 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Constant
Frame rate                               : 30.000 FPS
Standard                                 : Component
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.327
Stream size                              : 488 MiB (98%)


Audio
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 8 min 50 s
Source duration                          : 8 min 49 s
Bit rate mode                            : Constant
Bit rate                                 : 175 kb/s
Nominal bit rate                         : 192 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                              : 11.1 MiB (2%)
Source stream size                       : 11.1 MiB (2%)
mdhd_Duration                            : 530057
</code></pre>
<p>However, if I edit it with Davinci Resolve 17 Beta, the rendered output has out-of-sync issue. The video lags about 1-2 seconds behind the audio.</p>
<p>Could you tell me what causes this issue?</p>
<h1>Edit 1</h1>
<p>Is it due to the difference of frame rate? The following is taken from the above metadata.</p>
<pre><code>Video Frame rate                               : 30.000 FPS
Audio Frame rate                               : 43.066 FPS (1024 SPF)
</code></pre>
<h1>Edit 2</h1>
<p>I dragged and drop the MP4 clip onto the timeline. The end part of the timeline is shown as follows.</p>
<p><a href="https://i.sstatic.net/bmPRa.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/bmPRa.png" alt="enter image description here" /></a></p>
<p>There are some delayed frames at the end. How to fix this?</p>

CC BY-SA 4.0
2021-03-09T12:08:38.413Z
FPS means something different for audio. See here: https://stackoverflow.com/questions/61235189/video-is-25fps-audio-50-fps
Matt
CC BY-SA 4.0
2021-03-09T13:00:12.877Z
@Matt: Thank you for informing it. It is very helpful.
Display Name
<davinci-resolve>
Davinci Resolve: The rendered output has video that lags 1-2 seconds behind audio
Display Name
# Davinci Resolve: The rendered output has video that lags 1-2 seconds behind audio

(Asked by: username_0 on 2021-03-09)

I record an MP4 video with IPEVO document camera. There is no out of sync problem. Here is the metadata of the MP4 video (as the media source).
General
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (mp41/isom)
File size                                : 499 MiB
Duration                                 : 8 min 50 s
Overall bit rate                         : 7 897 kb/s


Video
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Baseline@L3.1
Format settings                          : 4 Ref Frames
Format settings, CABAC                   : No
Format settings, Reference frames        : 4 frames
Format settings, GOP                     : M=1, N=15
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 8 min 50 s
Bit rate                                 : 7 717 kb/s
Width                                    : 1 024 pixels
Height                                   : 768 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Constant
Frame rate                               : 30.000 FPS
Standard                                 : Component
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.327
Stream size                              : 488 MiB (98%)


Audio
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 8 min 50 s
Source duration                          : 8 min 49 s
Bit rate mode                            : Constant
Bit rate                                 : 175 kb/s
Nominal bit rate                         : 192 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                              : 11.1 MiB (2%)
Source stream size                       : 11.1 MiB (2%)
mdhd_Duration                            : 530057

However, if I edit it with Davinci Resolve 17 Beta, the rendered output has out-of-sync issue. The video lags about 1-2 seconds behind the audio.
Could you tell me what causes this issue?
Edit 1
Is it due to the difference of frame rate? The following is taken from the above metadata.
Video Frame rate                               : 30.000 FPS
Audio Frame rate                               : 43.066 FPS (1024 SPF)

Edit 2
I dragged and drop the MP4 clip onto the timeline. The end part of the timeline is shown as follows.

There are some delayed frames at the end. How to fix this?

**Tags:** davinci-resolve

> **Comments:**
> **username_1**: FPS means something different for audio. See here: https://stackoverflow.com/questions/61235189/video-is-25fps-audio-50-fps  
> **username_0**: @username_1: Thank you for informing it. It is very helpful.  

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## 0 answers

