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  1. Member
    Join Date
    Sep 2008
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    Hi guys,

    I am currently trying to convert a batch of MKV files into AVI files for compatibility with my DivX Player. In order to prevent frame-rate lag issues with the audio, I have to specify a frame rate when re-encoding the files (As you guys have taught me a long time ago).

    Anyways, I am currently using MediaInfo to pinpoint to frame rate I should use and I get two frame rate numbers to choose from.

    Code:
    General
    Complete name                    : L:\File1.mkv
    Format                           : Matroska
    File size                        : 149 MiB
    Duration                         : 23mn 50s
    Overall bit rate                 : 875 Kbps
    Encoded date                     : UTC 2011-04-05 18:38:03
    Writing application              : mkvmerge v4.0.0 ('The Stars were mine') built on Jun  6 2010 16:18:42
    Writing library                  : libebml v1.0.0 + libmatroska v1.0.0
    Cover                            : Yes
    
    Video
    Format                           : AVC
    Format/Info                      : Advanced Video Codec
    Format profile                   : High@L3.1
    Format settings, CABAC           : Yes
    Format settings, ReFrames        : 8 frames
    Codec ID                         : V_MPEG4/ISO/AVC
    Duration                         : 23mn 38s
    Nominal bit rate                 : 750 Kbps
    Width                            : 848 pixels
    Height                           : 480 pixels
    Display aspect ratio             : 16/9
    Frame rate                       : 23.810 fps
    Original frame rate              : 24.000 fps
    Colorimetry                      : 4:2:0
    Scan type                        : Progressive
    Bits/(Pixel*Frame)               : 0.077
    Writing library                  : x264 core 98 r1629 2e81ce1
    Encoding settings                : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=6 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / weightp=0 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=750 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=1927 / vbv_bufsize=1927 / ip_ratio=1.40 / aq=1:0.50 / nal_hrd=none
    
    Audio
    Format                           : AAC
    Format/Info                      : Advanced Audio Codec
    Format version                   : Version 4
    Format profile                   : LC
    Format settings, SBR             : No
    Codec ID                         : A_AAC
    Duration                         : 23mn 50s
    Channel(s)                       : 2 channels
    Channel positions                : L R
    Sampling rate                    : 44.1 KHz
    Resolution                       : 16 bits
    
    Text
    Format                           : ASS
    Codec ID                         : S_TEXT/ASS
    Codec ID/Info                    : Advanced Sub Station Alpha
    Which frame rate should I use? Google hasn't been to kind to me when I was searching. I doubt re-encoding at 23.810fps or 24.000fps will make a big difference, but it's nice to know which is the correct approach.
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  2. The way I think it works...
    The frame rate is written to the video stream and also at the container level. After you've remuxed video while changing the frame rate, MediaInfo displays the original frame rate written to the video stream as "original frame rate". The new frame rate, after remuxing the video while manually changing it during the process, is displayed as "frame rate".

    If the video in question doesn't have audio sync issues, you'd want to use "frame rate".

    How do you go about specifying a frame rate when encoding? 99.99% of the time it's probably not necessary.
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