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  1. (sorry, bad english)

    With Avidemux I cut out a small clip from a big video file.
    Then I save the clip.

    MKV with x264: height=1280 width=536 Bitrate=2000

    Avidemux:
    Mpeg4 AVC (x264)
    Average Bitrate (Two Pass) = 1500
    No video filter.
    -> Result: video size = 50 MB (Mediainfo shows: 1280x536 and Bitrate 1500)

    Avidemux:
    Mpeg4 AVC (x264)
    Average Bitrate (Two Pass) = 1500
    Filter swsResize: height=640 width=272
    -> Result: video size = 50 MB (Mediainfo shows: 640x272 and Bitrate 1500)

    Why is this the same size? I don't understand this.

    Please, can anyone help me?
    Last edited by Tedbax; 12th Mar 2016 at 00:22.
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  2. Member
    Join Date
    Jan 2007
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    United States
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    assuming you mean "file size" ?

    because you used the same bit rate ?

    1500 is NOT a large bit rate it is a small/low bit rate

    the overall quality of the video frames is going to be better/higher with the small frame vrs the large frame

    in other words your bit rate is too low for the original size clip cut/edit

    your size is the same for each video clip, because you are using the bare minamum bit rate, it really can;t compress any smaller

    just my opinion, maybe i am wrong
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  3. Originally Posted by theewizard View Post
    assuming you mean "file size" ?

    because you used the same bit rate ?

    1500 is NOT a large bit rate it is a small/low bit rate

    the overall quality of the video frames is going to be better/higher with the small frame vrs the large frame

    in other words your bit rate is too low for the original size clip cut/edit

    your size is the same for each video clip, because you are using the bare minamum bit rate, it really can;t compress any smaller

    just my opinion, maybe i am wrong
    Yes, I mean file size.
    I run Avidemus two times (input is a mkv with 1280x536, bitrate 2000, file size 5 GB).
    Run 1: 1280x536
    Run 2: 640x272
    And both output files are 50 MB.
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  4. Member DB83's Avatar
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    Jul 2007
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    United Kingdom
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    As said, frame size does NOT affect file size.

    File size = run length * Bit Rate.

    So if Bit Rate stays the same then so does the file size.
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  5. Member
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    Nova Scotia, Canada
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    As mentioned, downsizing the res does not affect the file size. However, downsizing should give you better quality at the same bit rate.
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  6. OK.
    Thank you for your answers.
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