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  1. Member
    Join Date: Sep 2010
    Location: India
    Search Comp PM
    Hi,

    I convert my mp4 movies such as this

    General
    Complete name : E:\XXXXXXXX.mp4
    Format : MPEG-4
    Format profile : Base Media / Version 2
    Codec ID : mp42
    File size : 1.80 GiB
    Duration : 1h 29mn
    Overall bit rate mode : Variable
    Overall bit rate : 2 888 Kbps
    Movie name : XXXXXXXXXX
    Encoded date : UTC 2014-06-26 19:20:07
    Tagged date : UTC 2014-06-26 20:49:07
    Writing application : HandBrake rev0 2013051899

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4.0
    Format settings, CABAC : Yes
    Format settings, ReFrames : 8 frames
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 1h 29mn
    Bit rate mode : Variable
    Bit rate : 2 500 Kbps
    Width : 1 280 pixels
    Height : 544 pixels
    Display aspect ratio : 2.35:1
    Frame rate mode : Variable
    Frame rate : 23.976 fps
    Minimum frame rate : 23.810 fps
    Maximum frame rate : 1 000.000 fps
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.150
    Stream size : 1.55 GiB (87%)
    Writing library : x264 core 130 r2273 b3065e6
    Encoding settings : cabac=1 / ref=9 / deblock=1:-3:-3 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-3 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=9 / b_pyramid=1 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=2500 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
    Encoded date : UTC 2014-06-26 19:20:07
    Tagged date : UTC 2014-06-26 20:49:07
    Color primaries : BT.709
    Transfer characteristics : BT.709
    Matrix coefficients : BT.709

    Audio
    ID : 2
    Format : AAC
    Format/Info : Advanced Audio Codec
    Format profile : LC
    Codec ID : 40
    Duration : 1h 29mn
    Bit rate mode : Variable
    Bit rate : 384 Kbps
    Maximum bit rate : 661 Kbps
    Channel(s) : 6 channels
    Channel positions : Front: L C R, Side: L R, LFE
    Sampling rate : 48.0 KHz
    Compression mode : Lossy
    Delay relative to video : 83ms
    Stream size : 244 MiB (13%)
    Language : English
    Encoded date : UTC 2014-06-26 19:20:07
    Tagged date : UTC 2014-06-26 20:49:07


    Here it says that bitrate mode is variable

    My converted file, via TEncoder is

    [COLOR="rgb(139, 0, 0)"]
    General
    Complete name : E:\YYYYYYY.mp4
    Format : MPEG-4
    Format profile : Base Media
    Codec ID : isom
    File size : 1.80 GiB
    Duration : 1h 29mn
    Overall bit rate : 2 889 Kbps
    Movie name : YYYYYYYYY
    Writing application : Lavf55.37.102

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L4.0
    Format settings, CABAC : Yes
    Format settings, ReFrames : 8 frames
    Codec ID : avc1
    Codec ID/Info : Advanced Video Coding
    Duration : 1h 29mn
    Bit rate : 2 500 Kbps
    Width : 1 280 pixels
    Height : 544 pixels
    Display aspect ratio : 2.35:1
    Frame rate mode : Variable
    Frame rate : 23.976 fps
    Minimum frame rate : 23.810 fps
    Maximum frame rate : 24.390 fps
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.150
    Stream size : 1.55 GiB (87%)
    Writing library : x264 core 130 r2273 b3065e6
    Encoding settings : cabac=1 / ref=9 / deblock=1:-3:-3 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-3 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=9 / b_pyramid=1 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=2500 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
    Color primaries : BT.709
    Transfer characteristics : BT.709
    Matrix coefficients : BT.709

    Audio
    ID : 2
    Format : AC-3
    Format/Info : Audio Coding 3
    Mode extension : CM (complete main)
    Format settings, Endianness : Big
    Codec ID : ac-3
    Duration : 1h 29mn
    Bit rate mode : Constant
    Bit rate : 384 Kbps
    Channel(s) : 6 channels
    Channel positions : Front: L C R, Side: L R, LFE
    Sampling rate : 48.0 KHz
    Bit depth : 16 bits
    Compression mode : Lossy
    Delay relative to video : 83ms
    Stream size : 245 MiB (13%)
    Language : English[/COLOR]

    My question is, I convert just the audio and leave the video are "copy source". The resultant file doesnot mention variable bitrate, so, did I lose the variable mode to constant mode? Is there any way to retain variable bitrate mode? If the question appears noobish, please don't be sarcastic....

    Thanks in advance
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  2. Originally Posted by socrates View Post
    The resultant file doesnot mention variable bitrate, so, did I lose the variable mode to constant mode? Is there any way to retain variable bitrate mode?
    For the AC3 audio? No, but you might get better sounding audio by making it 448 Kbps if that's an option.
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  3. Member
    Join Date: Sep 2010
    Location: India
    Search Comp PM
    Thanks Manono...thats good assurance. I was asking for the video part...
    Last edited by socrates; 6th Jul 2014 at 02:38. Reason: Clarity to the question
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  4. Originally Posted by socrates View Post
    I was asking for the video part...
    For the video part? That's why I answered about the audio - because both videos already show as VBR.
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  5. Member
    Join Date: Nov 2013
    Location: Serbia
    Search Comp PM
    No, you didn't. Just because MediaInfo does not report it it doesn't mean your video is CBR. After all, you just copied video part.

    Also, x264 does not realy support CBR mode, only ABR and VBR.
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