Opened 13 years ago

Closed 13 years ago

Last modified 13 years ago

#482 closed enhancement (fixed)

MPEG-4 aspect ratio respected by other players

Reported by: Sebastian.Leske@… Owned by: diego@…
Priority: normal Component: DOCS
Version: unspecified Severity: minor
Keywords: Cc:
Blocked By: Blocking:
Reproduced by developer: Analyzed by developer:

Description

There is a small error in the MPlayer docs.

In Section 12.9. "Preserving aspect ratio"
it says

MPEG-4 has an unique feature: the video stream can contain its needed
aspect ratio. Yes, just like MPEG-1/2 (DVD, SVCD) and H.263 files.
Regretfully, there are no video players outside which support this
attribute of MPEG-4, except MPlayer.

This is not true. At least xine seems to support it as well.

I tried encoding the same input video twice with mencoder, once with
-lavcopts autoaspect, and once without.

MPlayer plays the first file with the correct aspect, and the second
with the default, wrong aspect, as it should.

Xine (tested with v0.9.23) does the same, so it obviously somehow
recognizes the aspect ratio information embedded by mencoder.

VLC also reads aspect ratio information from MPEG-4 files according to
its docs (though I didn't try it).

Therefore I propose to change the section above to:

MPEG-4 has an unique feature: the video stream can contain its needed
aspect ratio. Yes, just like MPEG-1/2 (DVD, SVCD) and H.263 files.
Regretfully, apart from MPlayer few video players support this
attribute of MPEG-4. Xine and VLC for example reportedly support it.

Change History (1)

comment:1 Changed 13 years ago by diego@…

  • Resolution set to fixed
  • Status changed from new to closed

Fixed similarly.

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