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  1. I have MPG videos (some MPEG 1, some MPEG 2). They are 16:9 but many years ago I converted them to 4:3. Stupid idea. All peoples are too thin
    I'd like to chane aspect back without re-encoding.

    I found program called DVDPatcher .

    But when using option First header only program changes nothing.

    So question:
    there is option Entire file . Is it doing re-encoding or not?


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  2. I'm a Super Moderator johns0's Avatar
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    If you are going to watch the videos on your tv you will need to re-encode them since most tv wont recognize dvdpatcher flags,
    I think,therefore i am a hamster.
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  3. Member DB83's Avatar
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    Well according to your screen, your video was already 16:9


    Are you certain you converted to 4:3 or simply not playing them correctly.
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  4. Originally Posted by SmurfRecorder View Post
    So question:
    there is option Entire file . Is it doing re-encoding or not?
    Not re-encoding
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  5. You can demux, use Restream on the M2V, followed by remuxing.

    But "entire file" is probably the better choice.
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  6. Originally Posted by DB83 View Post
    Well according to your screen, your video was already 16:9
    Are you certain you converted to 4:3 or simply not playing them correctly.
    This screen is from this site. I am too lazy to press Print-Screen
    And yes my videos are 4:3 (checked with media info)

    Originally Posted by johns0 View Post
    If you are going to watch the videos on your tv you will need to re-encode them since most tv wont recognize dvd patcher flags,
    So, could anyone suggest other program to change aspect of mpg? Quality is bad, so only option is do it without re-encoding. I know I can save it to MKV with Avidemux, but I must give some videos for aunt, and she has old TV which not support mkv, and mp4 format not support MPEG1/2.

    P.S. On my TV it's playing correctly so maybe on her TV will be playing also.
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  7. You can use clever Ffmpeg-GUI to change the display aspect ratio (DAR) without recoding.
    Last edited by ProWo; 15th May 2021 at 16:24.
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  8. Member
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    Originally Posted by SmurfRecorder View Post
    So question:
    there is option Entire file . Is it doing re-encoding or not?
    DVDPatcher cannot do any encoding, it can only modify flags.

    "Entire file" means it will modify/patch not only the header of the first GOP in a file but rather the header of every GOP within the file.


    So if you "converted" those video files years ago from 16:9 to 4:3 in the same manner – by patching the flags – this will undo that without quality loss. If however you messed with the aspect ratio in some other way, this may not be able to fix it, depending on what exactly happened.
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  9. Originally Posted by SmurfRecorder View Post
    So, could anyone suggest other program to change aspect of mpg?
    As I already suggested:

    Originally Posted by manono View Post
    You can demux, use Restream on the M2V, followed by remuxing.
    It requires the demux, and will do it only for the video, not the MPG. No reencoding. If it's a DVD, PGCEdit can easily change the DAR.
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