Obs Auto-Remux changing constant frame rate to variable

Oninaig

Oninaig

New Member
The auto-remux feature is remuxing my mkv files that have a constant frame rate and outputting mp4 files that have variable frame rates which causes them to have issues with programs like Premiere Pro, etc.

Here is an example recording using NVENC lossless:

MKV File:


Code: 
PS E:\Tools\MediaInfo> .\MediaInfo.exe .\2020-06-30_17-05-04.mkv
General
Unique ID                                : 339760426610405131615425805183653800503 (0xFF9B7A5B1B48EBCBD9AD2E260D506A37)
Complete name                            : .\2020-06-30_17-05-04.mkv
Format                                   : Matroska
Format version                           : Version 4
File size                                : 4.25 MiB
Duration                                 : 6 s 634 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 5 370 kb/s
Writing application                      : Lavf58.29.100
Writing library                          : Lavf58.29.100
ErrorDetectionType                       : Per level 1

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High 4:4:4 Predictive@L5.1
Format settings                          : 2 Ref Frames
Format settings, CABAC                   : No
Format settings, Reference frames        : 2 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 6 s 634 ms
Bit rate mode                            : Variable
Maximum bit rate                         : 120 Mb/s
Width                                    : 2 560 pixels
Height                                   : 1 440 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 60.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Default                                  : Yes
Forced                                   : No
Color range                              : Limited
Matrix coefficients                      : BT.470 System B/G

Audio #1
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : A_AAC-2
Duration                                 : 6 s 594 ms
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 44.1 kHz
Frame rate                               : 43.066 FPS (1024 SPF)
Compression mode                         : Lossy
Title                                    : Track1
Default                                  : Yes
Forced                                   : No

Audio #2
ID                                       : 3
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : A_AAC-2
Duration                                 : 6 s 594 ms
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 44.1 kHz
Frame rate                               : 43.066 FPS (1024 SPF)
Compression mode                         : Lossy
Title                                    : Track2
Default                                  : Yes
Forced                                   : No

And here is the remuxed file:


Code: 
PS E:\Tools\MediaInfo> .\MediaInfo.exe .\2020-06-30_17-05-04.mp4
General
Complete name                            : .\2020-06-30_17-05-04.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 4.26 MiB
Duration                                 : 6 s 617 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 5 398 kb/s
Writing application                      : Lavf58.29.100

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High 4:4:4 Predictive@L5.1
Format settings                          : 2 Ref Frames
Format settings, CABAC                   : No
Format settings, Reference frames        : 2 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 6 s 615 ms
Bit rate mode                            : Variable
Bit rate                                 : 5 101 kb/s
Maximum bit rate                         : 120 Mb/s
Width                                    : 2 560 pixels
Height                                   : 1 440 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Frame rate                               : 60.000 FPS
Minimum frame rate                       : 58.824 FPS
Maximum frame rate                       : 62.500 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.023
Stream size                              : 4.02 MiB (94%)
Color range                              : Limited
Matrix coefficients                      : BT.470 System B/G
Codec configuration box                  : avcC

Audio #1
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 6 s 617 ms
Bit rate mode                            : Constant
Bit rate                                 : 160 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                              : 130 KiB (3%)
Title                                    : Track1
Default                                  : Yes
Alternate group                          : 1

Audio #2
ID                                       : 3
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 6 s 617 ms
Bit rate mode                            : Constant
Bit rate                                 : 113 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                              : 91.4 KiB (2%)
Title                                    : Track2
Default                                  : No
Alternate group                          : 1

Is there a way to force the default auto-remux to maintain a constant frame rate?
 
Suslik V

Suslik V

Active Member
@prantikv NO. Your video was recorded with variable frame rate despite the programs (like MediaInfo) may say that it is not.

This was discussed a lot (there are some useful links and info inside):

Question / Help - OBS's Remux mkv to mp4 feature causes audio issues

I have been using ffmeg in command line (ffmpeg -i 'video file'.mkv -c copy 'video file'.mp4) to convert my mkv video captures to mp4 for editing in DaVinci Resolve (as Resolve doesn't support mkv file types) when using ffmeg i have never had any issues with my encoded videos form Resolve. I...
obsproject.com obsproject.com
 
P

prantikv

New Member
The thing is when i set the fps under settings>video to 25 PAL. This gives me a consant frame rate file both the original mkv and remuxed mp4 file, in both media info and in premiere properites. So no issues when I set it to common fps values 25 PAL. But with 24 it has issues.
 
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