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Thread: Compress video to a certain file size?

  1. #1

    Question Compress video to a certain file size?

    I have a 6-minute uncompressed VHS capture.


    It's currently 1.10 GB (6m 55s) and I'd like to compress it to around 20-25 MB.


    I know it will be poor quality but I was wondering if it can be done?


    Freemake Video Converter lets you choose a video output size but you can't enter custom size, you have to choose from it's recommended minimum, upward.

  2. #2

    Default

    You should be able to get a file size like that -- but it's not going to look good!

    Open your file in Virtualdub, select the x.264 vfw codec from the 'Compression' option in the 'Video' drop down menu and - in the configuration setting - select 'Single pass - bitrate based (ABR)'. Then set the Average bitrate setting to around 500 kbits/s.

    That should give you a file size within the range you're looking for.

    (You will need to encode the audio as well - the linear PCM audio stream in your 'uncompressed' file will be a large file, which you can educe by a factor of 8 or 10, by encoding as an AAC audio file)

    As I say, this is going to look pretty bad. .... Try a small test clip from your file at different bitrates - (say 750kb or 1000kb or 1500kb) to see if the extra file size shows a significant imprevement in performance.
    There will probably be a 'sweet spot' within that range to give you best compromise between file size and a drop in quality.

  3. #3

    Default

    Quote Originally Posted by rogs View Post
    You should be able to get a file size like that -- but it's not going to look good!

    Open your file in Virtualdub, select the x.264 vfw codec from the 'Compression' option in the 'Video' drop down menu and - in the configuration setting - select 'Single pass - bitrate based (ABR)'. Then set the Average bitrate setting to around 500 kbits/s.

    That should give you a file size within the range you're looking for.

    (You will need to encode the audio as well - the linear PCM audio stream in your 'uncompressed' file will be a large file, which you can educe by a factor of 8 or 10, by encoding as an AAC audio file)

    As I say, this is going to look pretty bad. .... Try a small test clip from your file at different bitrates - (say 750kb or 1000kb or 1500kb) to see if the extra file size shows a significant imprevement in performance.
    There will probably be a 'sweet spot' within that range to give you best compromise between file size and a drop in quality.
    Fantastic!

    Thank you, once again!

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