90000 fps rate problem

emmrecs wrote on 1/11/2021, 1:19 PM

Can you download, install and point the free MediaInfo at this file and copy and paste here the results of the Text view? We need to see what codecs etc. are being used in order to try and determine why this file seems to playback so fast! Does it literally play at 90000 fps or is that just you trying to describe what happens?

Jeff
Forum Moderator

johnebaker wrote on 1/11/2021, 1:50 PM

@Garry_A

Hi

What is the source of the MP4 file - an ultra high speed camera shooting at 90000 fps?

Do you mean 16+ from 2010, or are you abbreviating 2016+?

John EB
Forum Moderator

Garry_A wrote on 1/11/2021, 2:45 PM

I'm downloading video files off the internet, as mp4 files. I'm downloading at either 1080, 720 or less (currenlty trying a few different download transfer options). These are standard videos at standard speed.
Saved on to desktop, when watched using QuickTime player or Windows Media player the speed is okay at 29.97fps.
Then when imported into my existing movie the clip changes to 90000fps. EG a 10 minute video would become 0.8 of a second long.
I am running "16+ HD" from 2010. Using a Windows 10 machine. 64 bit.

johnebaker wrote on 1/11/2021, 3:08 PM

@Garry_A

Hi

We definitely need that MedaInfo analysis.

. . . . 16+ HD" from 2010. Using a Windows 10 machine . . . .

This could also be a contributor to the issue - MEP16+ is not compatible with Windows 10, and I am surprised that you actually are able to launch it.

We need your computer specification - see this topic for details of the information required also include whether Windows 10 is 32 bit or 64 bit.

Was Windows 10 a clean, or only, install, or has the computer been upgraded from 7 (or earlier) through 8 to 10?

John EB

Garry_A wrote on 1/11/2021, 3:25 PM

Windows 10 is 64 bit. From new.

MediaInfo for the video file is as follows...

General
Complete name                            : C:\Users\garry\OneDrive\Desktop\SEG\Diana 720 60fps.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 1.55 GiB
Duration                                 : 4 h 40 min
Overall bit rate                         : 792 kb/s
Writing application                      : Lavf58.29.100

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L3.1
Format settings                          : CABAC / 3 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 3 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 4 h 40 min
Duration_FirstFrame                      : -33 ms
Bit rate                                 : 659 kb/s
Width                                    : 854 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Frame rate                               : 29.970 FPS
Minimum frame rate                       : 29.970 FPS
Maximum frame rate                       : 29.990 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.054
Stream size                              : 1.29 GiB (83%)
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 4 h 40 min
Bit rate mode                            : Constant
Bit rate                                 : 126 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                              : 252 MiB (16%)
Default                                  : Yes
Alternate group                          : 1

As you can see the FPS is at 29.97, then once imported into my project it becomes 90000fps in the project.

johnebaker wrote on 1/11/2021, 3:48 PM

@Garry_A

Hi

Is this an OBS recording - if so see this topic on OBS from this comment onwards - it is a bit of along read!

. . . . As you can see the FPS is at 29.97 . . . .

Quite true, however the line I was expecting is this one:

Frame rate mode : Variable

That is the likely cause of the issue - when MEP16+ was released variable frame rate was 'in its infancy', the program expects to see Constant framerate video as do many others. The framerate range of min to max is very low.

Another issue you are going to have is the audio sample rate is 44.1 kHz, MEP is expecting 48kHz, this coupled with the Variable Frame rate (VFR) may give audio sync issues.

I would suggest downloading and installing Handbrake and convert the video to MP4 with h.264 encoding and Constant frame rate set in the Video tab, and in the Audio tab set 48kHz sample rate once you have added the video.

HTH

John EB

AAProds wrote on 1/11/2021, 6:00 PM

@Garry_A

Gday Garry, could you post the link to the problematic youtube video so we can have a look at the file ourselves?

Thanks, A

Garry_A wrote on 1/12/2021, 2:31 PM

@johnebaker . You're a star.

I've downloaded Handbrake, converted the troublesome video file it to MP4 h.264 with a constant Frame Rate.
Once imported in to the project the file is okay and keeps it 25fps format.

Thanks to all for your knowledge and ideas.
Case closed. Thread closed.