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  1. I have a video with the following properties

    General
    Format : AVI
    Format/Info : Audio Video Interleave
    File size : 175 MiB
    Duration : 21mn 11s
    Overall bit rate mode : Variable
    Overall bit rate : 1 154 Kbps
    Writing application : Some super fast AVI muxer

    Video
    ID : 0
    Format : MPEG-4 Visual
    Format profile : Advanced Simple@L5
    Format settings, BVOP : 2
    Format settings, QPel : No
    Format settings, GMC : No warppoints
    Format settings, Matrix : Default (H.263)
    Codec ID : XVID
    Codec ID/Hint : XviD
    Duration : 21mn 11s
    Bit rate : 992 Kbps
    Width : 624 pixels
    Height : 352 pixels
    Display aspect ratio : 16:9
    Frame rate : 23.976 fps
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Compression mode : Lossy
    Bits/(Pixel*Frame) : 0.188
    Stream size : 150 MiB (86%)
    Writing library : XviD 70

    Audio
    ID : 1
    Format : MPEG Audio
    Format version : Version 1
    Format profile : Layer 3
    Codec ID : 55
    Codec ID/Hint : MP3
    Duration : 21mn 11s
    Bit rate mode : Variable
    Bit rate : 149 Kbps
    Channel(s) : 2 channels
    Sampling rate : 48.0 KHz
    Compression mode : Lossy
    Stream size : 22.6 MiB (13%)
    Alignment : Aligned on interleaves
    Interleave, duration : 24 ms (0.58 video frame)
    Interleave, preload duration :38 ms


    Need to convert it to following mkv format to reduce the size without losing much quality...



    Format : Matroska
    Format version : Version 2
    File size : 69.4 MiB
    Duration : 21mn 48s
    Overall bit rate : 445 Kbps
    Encoded date : UTC 2009-11-20 18:33:49
    Writing application : mkvmerge v2.9.7 ('Tenderness') built on Jul 1 2009 18:43:35
    Writing library : libebml v0.7.7 + libmatroska v0.8.1

    Video
    ID : 1
    Format : AVC
    Format/Info : Advanced Video Codec
    Format profile : High@L3.1
    Format settings, CABAC : Yes
    Format settings, ReFrames : 2 frames
    Codec ID : V_MPEG4/ISO/AVC
    Duration : 21mn 48s
    Width : 640 pixels
    Height : 352 pixels
    Display aspect ratio : 16:9
    Frame rate : 23.976 fps
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Progressive
    Default : Yes
    Forced : No

    Audio
    ID : 2
    Format : AAC
    Format/Info : Advanced Audio Codec
    Format profile : HE-AAC / LC
    Codec ID : A_AAC
    Duration : 21mn 48s
    Channel(s) : 2 channels
    Channel positions : Front: L R
    Sampling rate : 48.0 KHz / 24.0 KHz
    Compression mode : Lossy
    Default : Yes
    Forced : No

    Menu
    00:00:00.097 : en:00:00:00.097

    As u can see both the video have almost the same length but the size of 2nd one is extremely less.Quality being as good as the first one!

    How do i convert the file?What codecs do i need?All i need is to convert the file without losing any quality.If there is any other format which can do that,please let me know about that too.

    P.S i am fairly new here.This is my first thread.So please help.Looking forward!
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  2. I'm a MEGA Super Moderator Baldrick's Avatar
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    You will lose quality. Especially when you shrink an already heavily compressed video again. It's best to convert directly from the best source available.

    But anyway, use for example handbrake, open your avi, change to mkv with h264 video and aac audio, under the video tab can you set the output file size, under the audio tab lower the bitrate to 64kbit/s. Convert and see how it looks like.
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  3. I know what you mean.But look at the above given mkv file.Both the files have almost the same length but the size of mkv file is less than even half.And the quality is perfect.What type of conversion should i do to get such a format??
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