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  1. Hi, i have an x264 file.
    Code:
    File size                   : 6.75 GiB
    
    Video
    Format                      : AVC
    Format/Info                 : Advanced Video Codec
    Format profile              : Main@L4
    Format settings             : CABAC / 4 Ref Frames
    Format settings, CABAC      : Yes
    Format settings, Reference  : 4 frames
    Bit rate mode               : Constant
    Bit rate                    : 9 000 kb/s / 9 000 kb/s
    Width                       : 1 920 pixels
    Height                      : 1 080 pixels
    Display aspect ratio        : 16:9
    Frame rate                  : 23.976 (24000/1001) FPS
    Color space                 : YUV
    Chroma subsampling          : 4:2:0
    Bit depth                   : 8 bits
    Scan type                   : Progressive
    Bits/(Pixel*Frame)          : 0.181
    Writing library             : x264 core 152
    Encoding settings           : cabac=1 / ref=2 / deblock=1:-1:-1 / analyse=0x1:0x131 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-3 / threads=36 / lookahead_threads=3 / sliced_threads=0 / slices=1 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / stitchable=1 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=48 / keyint_min=2 / scenecut=0 / intra_refresh=0 / rc_lookahead=48 / rc=cbr / mbtree=1 / bitrate=9000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=9000 / vbv_bufsize=9000 / nal_hrd=cbr / filler=1 / ip_ratio=1.40 / aq=3:1.00
    But after muxing with mkvmerge to mkv it shows different bitrate and filesize is much smaller than the orginal x264 file ? Is there anything wrong?

    Code:
    File size                   : 5.11 GiB
    
    Bit rate mode               : Constant
    Bit rate                    : 6 549 kb/s
    Nominal bit rate            : 9 000 kb/s / 9 000 kb/s
    Quote Quote  
  2. 1. Don't shorten the MediaInfo log.
    2. What is the source? Possibly mkvmerge removed useless AVC filler data often found in transport streams.
    https://forum.videohelp.com/threads/393138-mp4-file-has-turned-into-a-1-4GB-smaller-mkv-file
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  3. The orginal file/stream was dash/mp4 downloaded from a vod service... As i read in the thread you posted mkvmerge just removes these usesless H.264 filler NALU data
    Code:
    Format                      : iso6
    Codec ID                    : iso6 (iso6/dash)
    File size                   : 6.76 GiB
    Duration                    : 1 h 47 min
    Overall bit rate mode       : Constant
    Overall bit rate            : 9 005 kb/s
    
    Video
    ID                          : 1
    Format                      : AVC
    Format/Info                 : Advanced Video Codec
    Format profile              : Main@L4
    Format settings             : CABAC / 4 Ref Frames
    Format settings, CABAC      : Yes
    Format settings, Reference  : 4 frames
    Codec ID                    : avc1
    Codec ID/Info               : Advanced Video Coding
    Duration                    : 1 h 47 min
    Bit rate mode               : Constant
    Bit rate                    : 9 000 kb/s / 9 000 kb/s
    Maximum bit rate            : 14.6 Mb/s
    Width                       : 1 920 pixels
    Height                      : 1 080 pixels
    Display aspect ratio        : 16:9
    Frame rate mode             : Constant
    Frame rate                  : 23.976 (24000/1001) FPS
    Color space                 : YUV
    Chroma subsampling          : 4:2:0
    Bit depth                   : 8 bits
    Scan type                   : Progressive
    Bits/(Pixel*Frame)          : 0.181
    Stream size                 : 6.75 GiB (100%)
    Writing library             : x264 core 152
    Encoding settings           : cabac=1 / ref=2 / deblock=1:-1:-1 / analyse=0x1:0x131 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-3 / threads=36 / lookahead_threads=3 / sliced_threads=0 / slices=1 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / stitchable=1 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=48 / keyint_min=2 / scenecut=0 / intra_refresh=0 / rc_lookahead=48 / rc=cbr / mbtree=1 / bitrate=9000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=9000 / vbv_bufsize=9000 / nal_hrd=cbr / filler=1 / ip_ratio=1.40 / aq=3:1.00
    Language                    : English
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  4. Dinosaur Supervisor KarMa's Avatar
    Join Date
    Jul 2015
    Location
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    Yeah looks like filler data.
    Quote Quote  



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