Framerate issue

[Damiano]

I have an MKV file that is somehow wrong. First thing I noticed is that the audio is positively too fast. I ran it through mediainfo and got this:

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 12 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 24mn 16s
Width                                    : 704 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 4:3
Original display aspect ratio            : 3:2
Frame rate mode                          : Constant
Frame rate                               : 25.997 fps
Original frame rate                      : 23.976 fps
Standard                                 : NTSC
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Writing library                          : x264 core 78 r1309M 4d77de8
Encoding settings                        : cabac=1 / ref=12 / deblock=1:1:1 / analyse=0x3:0x133 / me=umh / subme=10 / psy=1 / psy_rd=0.4:0.0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / chroma_qp_offset=-2 / threads=6 / nr=0 / decimate=1 / mbaff=0 / constrained_intra=0 / bframes=5 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / wpredb=1 / keyint=250 / keyint_min=25 / scenecut=40 / rc_lookahead=50 / rc=crf / mbtree=0 / crf=17.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / vbv_maxrate=17500 / vbv_bufsize=14000 / ip_ratio=1.40 / pb_ratio=1.30 / aq=1:0.20

So, I surmised that it should really be 23.976 and I have no clue why it's overridden somehow to something that doesn't even exist as an accepted standard. Deliberate speedup? It didn't require it at all, now it's just out of whack. Anyway, my question is, is there an easy way to fix this without re-encoding?

[jagabo]

Try remuxing with MvktoonixGUI specifying the lower frame rate. You may have to adjust the audio too.

But what to you mean by "too fast"? Is the audio out of sync with the video? Is the pitch too high?

[Damiano]

Try remuxing with MvktoonixGUI specifying the lower frame rate. You may have to adjust the audio too.

Thanks, I will try.

But what to you mean by "too fast"? Is the audio out of sync with the video? Is the pitch too high?

Yes, sorry. That's exactly what I meant, it's definitely higher than what it's supposed to be but not out of sync, no.