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  1. Member
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    Aug 2006
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    I am using MKVCleaver to demux MKV files so I can re-mix the audio. I then use MKVMerge to mux the raw .264 files and my new AC3 track. When I add the video file to MKVMerge I get the prompt to enter the frame rate. I enter the frame rate as shown in with Mediainfo for the original file. After MUXing I get a different frame rate than what I entered. Is that normal? I really don't see any difference to my eye but the OCD in me makes me want to post and ask here.

    This is one example:

    Original MKV:

    General
    Complete name : F:\RiffTrax Projects\XXX\XXX.mkv
    Format : Matroska
    File size : 2.70 GiB
    Duration : 2h 4mn
    Overall bit rate : 3 112 Kbps
    Writing application : HandBrake 0.9.5
    Writing library : libmkv 0.6.4.1

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L3.0
    Format settings, CABAC : Yes
    Format settings, ReFrames : 4 frames
    Muxing mode : Container profile=Unknown@3.0
    Codec ID : V_MPEG4/ISO/AVC
    Duration : 2h 3mn
    Bit rate : 2 602 Kbps
    Width : 720 pixels
    Height : 360 pixels
    Display aspect ratio : 2.35:1
    Original display aspect ratio : 2.35:1
    Frame rate mode : Variable
    Frame rate : 23.976 fps
    Resolution : 24 bits
    Colorimetry : 4:2:0
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.419
    Stream size : 2.25 GiB (84%)
    Writing library : x264 core 112
    Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=15.0 / qcomp=0.60 / qpmin=3 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
    colour_primaries : BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M
    transfer_characteristics : BT.709-5, BT.1361
    matrix_coefficients : BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M

    Audio
    ID : 2
    Format : AC-3
    Format/Info : Audio Coding 3
    Codec ID : A_AC3
    Duration : 2h 4mn
    Bit rate mode : Constant
    Bit rate : 448 Kbps
    Channel(s) : 6 channels
    Channel positions : Front: L C R, Surround: L R, LFE
    Sampling rate : 48.0 KHz
    Stream size : 398 MiB (14%)
    Language : English
    Remixed MKV:

    eneral
    Complete name : F:\RiffTrax Projects\XXX\RT-003-XXX_SD.mkv
    Format : Matroska
    File size : 2.69 GiB
    Duration : 2h 4mn
    Overall bit rate : 3 109 Kbps
    Encoded date : UTC 2011-07-11 03:53:41
    Writing application : mkvmerge v4.8.0 ('I Got The...') built on May 24 2011 03:12:58
    Writing library : libebml v1.2.0 + libmatroska v1.1.0

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L3.0
    Format settings, CABAC : Yes
    Format settings, ReFrames : 4 frames
    Muxing mode : Container profile=Unknown@3.0
    Codec ID : V_MPEG4/ISO/AVC
    Duration : 2h 4mn
    Bit rate : 2 599 Kbps
    Width : 720 pixels
    Height : 360 pixels
    Display aspect ratio : 2.35:1
    Original display aspect ratio : 2.35:1
    Frame rate mode : Variable
    Frame rate : 20.000 fps
    Resolution : 24 bits
    Colorimetry : 4:2:0
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.501
    Stream size : 2.25 GiB (84%)
    Writing library : x264 core 112
    Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=15.0 / qcomp=0.60 / qpmin=3 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
    colour_primaries : BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M
    transfer_characteristics : BT.709-5, BT.1361
    matrix_coefficients : BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M

    Audio
    ID : 2
    Format : AC-3
    Format/Info : Audio Coding 3
    Codec ID : A_AC3
    Duration : 2h 4mn
    Bit rate mode : Constant
    Bit rate : 448 Kbps
    Channel(s) : 2 channels
    Channel positions : L R
    Sampling rate : 48.0 KHz
    Stream size : 398 MiB (14%)

    Like I said to my eyes I don't notice a difference but it doesn't seem right. Any tips? Better tools for the job?

    Thanks!!
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  2. Member rickydavao's Avatar
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    You don't need to do the extra (1st) step of demuxing your MKV. Open MKVMerge and add your original MKV file. You will notice in the middle "window" of MKVMerge that it will display all the tracks making up your original MKV file ... in your case probably only the video and (original) audio. Each will have a checked box on their left. Uncheck the box for the audio, thereby deselecting it for the mux. Now add your new AC3 file to the same project, and go ahead and mux. You should have a new MKV with the original video and new audio, without the original audio.
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  3. Member
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    Originally Posted by rickydavao View Post
    You don't need to do the extra (1st) step of demuxing your MKV. Open MKVMerge and add your original MKV file. You will notice in the middle "window" of MKVMerge that it will display all the tracks making up your original MKV file ... in your case probably only the video and (original) audio. Each will have a checked box on their left. Uncheck the box for the audio, thereby deselecting it for the mux. Now add your new AC3 file to the same project, and go ahead and mux. You should have a new MKV with the original video and new audio, without the original audio.
    That is good info. Thanks! There are times though that I need the audio track from the MKV to make my re-mix. Is there any tool you recommend that I could use to just rip or copy the audio only from the MKV file?
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  4. Member rickydavao's Avatar
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    MKVCleaver should be fine for extracting just the audio from your MKV file, as I believe you can specify which tracks you want to extract (ie. just the audio). Of course, if you extract all of the tracks, you can just delete the wants you don't need (ie. the video) as long as you keep your original MKV file. I think I used to use OGMCleaver (since it also does MKV files) to extract the tracks from my MKV files, but I think that was only because it was quick and very easy to use.
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  5. Member
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    Thanks again for the info!!
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