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how to force VLC or MPlayer to add letterbox padding

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  how to force VLC or MPlayer to add letterbox padding Robert Riches <spamtrap42@jacob21819.net> - 2014-09-09 04:05 +0000
    Re: how to force VLC or MPlayer to add letterbox padding Robert Komar <robk@robpc4.home.org> - 2014-09-08 23:37 -0700
      Re: how to force VLC or MPlayer to add letterbox padding Robert Riches <spamtrap42@jacob21819.net> - 2014-09-10 02:47 +0000
    Re: how to force VLC or MPlayer to add letterbox padding Rich <rich@example.invalid> - 2014-09-09 10:27 +0000
      Re: how to force VLC or MPlayer to add letterbox padding Robert Riches <spamtrap42@jacob21819.net> - 2014-09-10 02:47 +0000

#12060 — how to force VLC or MPlayer to add letterbox padding

Is there a way to force VLC and/or MPlayer to add black padding
at the top and bottom of the (non-full-screen) displaying window?
In the case of interest, I have a 640x360 network stream that I
want to display in a 640x480 window by adding padding (rather
than stretching).  The fine manual, the usage message, and
Googling have thus far not yielded the answer.

Thanks.

-- 
Robert Riches
spamtrap42@jacob21819.net
(Yes, that is one of my email addresses.)

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#12066

Robert Riches <spamtrap42@jacob21819.net> wrote:
> Is there a way to force VLC and/or MPlayer to add black padding
> at the top and bottom of the (non-full-screen) displaying window?
> In the case of interest, I have a 640x360 network stream that I
> want to display in a 640x480 window by adding padding (rather
> than stretching).  The fine manual, the usage message, and
> Googling have thus far not yielded the answer.
> 
> Thanks.

It would have helped if you gave the options you were using, but
here goes anyway:

mplayer -vf expand=640:480 <path-to-video>

I've tested it with a file, but not with any streaming video.
If the source video prescaled and you want to scale it to 640
pixels, then use:

mplayer -vf scale=640:-2,expand=640:480 <path-to-video>

Cheers,
Rob

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#12089

On 2014-09-09, Robert Komar <robk@robpc4.home.org> wrote:
> Robert Riches <spamtrap42@jacob21819.net> wrote:
>> Is there a way to force VLC and/or MPlayer to add black padding
>> at the top and bottom of the (non-full-screen) displaying window?
>> In the case of interest, I have a 640x360 network stream that I
>> want to display in a 640x480 window by adding padding (rather
>> than stretching).  The fine manual, the usage message, and
>> Googling have thus far not yielded the answer.
>> 
>> Thanks.
>
> It would have helped if you gave the options you were using, but
> here goes anyway:
>
> mplayer -vf expand=640:480 <path-to-video>
>
> I've tested it with a file, but not with any streaming video.
> If the source video prescaled and you want to scale it to 640
> pixels, then use:
>
> mplayer -vf scale=640:-2,expand=640:480 <path-to-video>
>
> Cheers,
> Rob

Thank you very much!  That's exactly what I was looking for!
"expand" didn't come up in my earlier searching.

-- 
Robert Riches
spamtrap42@jacob21819.net
(Yes, that is one of my email addresses.)

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#12075

Robert Riches <spamtrap42@jacob21819.net> wrote:
> Is there a way to force VLC and/or MPlayer to add black padding at
> the top and bottom of the (non-full-screen) displaying window? In the
> case of interest, I have a 640x360 network stream that I want to
> display in a 640x480 window by adding padding (rather than
> stretching).  The fine manual, the usage message, and Googling have
> thus far not yielded the answer.

man mplayer:

   expand[=w:h:x:y:o:a:r]
          Expands (not scales) movie resolution to the given value
          and places the unscaled original at coordinates x, y.  Can be
          used for placing subtitles/OSD in the resulting black bands.

             <w>,<h>
                  Expanded width,height (default: original
                  width,height).  Negative values for w and h are
                  treated as offsets to the original size.

                  EXAMPLE:
                       expand=0:-50:0:0
                              Adds a 50 pixel border to the bottom of
                              the picture.

             <x>,<y>
                  position of original image on the expanded image
                  (default: center)

             <o>
                  OSD/subtitle rendering
                     0: disable (default)
                     1: enable

             <a>
                  Expands to fit an aspect instead of a resolution
                  (default: 0).

                  EXAMPLE:
                       expand=800:::::4/3
                              Expands to 800x600, unless the source is
                              higher resolution, in which case it
                              expands to fill a 4/3 aspect.

             <r>
                  Rounds up to make both width and height divisible by
                  <r> (default: 1).

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#12090

On 2014-09-09, Rich <rich@example.invalid> wrote:
> Robert Riches <spamtrap42@jacob21819.net> wrote:
>> Is there a way to force VLC and/or MPlayer to add black padding at
>> the top and bottom of the (non-full-screen) displaying window? In the
>> case of interest, I have a 640x360 network stream that I want to
>> display in a 640x480 window by adding padding (rather than
>> stretching).  The fine manual, the usage message, and Googling have
>> thus far not yielded the answer.
>
> man mplayer:
>
>    expand[=w:h:x:y:o:a:r]
>           Expands (not scales) movie resolution to the given value
>           and places the unscaled original at coordinates x, y.  Can be
>           used for placing subtitles/OSD in the resulting black bands.
>
>              <w>,<h>
>                   Expanded width,height (default: original
>                   width,height).  Negative values for w and h are
>                   treated as offsets to the original size.
>
>                   EXAMPLE:
>                        expand=0:-50:0:0
>                               Adds a 50 pixel border to the bottom of
>                               the picture.
>
>              <x>,<y>
>                   position of original image on the expanded image
>                   (default: center)
>
>              <o>
>                   OSD/subtitle rendering
>                      0: disable (default)
>                      1: enable
>
>              <a>
>                   Expands to fit an aspect instead of a resolution
>                   (default: 0).
>
>                   EXAMPLE:
>                        expand=800:::::4/3
>                               Expands to 800x600, unless the source is
>                               higher resolution, in which case it
>                               expands to fill a 4/3 aspect.
>
>              <r>
>                   Rounds up to make both width and height divisible by
>                   <r> (default: 1).

Thank you very much!  That's the option that had eluded me in my
earlier searching.  It works beautifully!

-- 
Robert Riches
spamtrap42@jacob21819.net
(Yes, that is one of my email addresses.)

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