[MPlayer-users] gmplayer displays just a crop of an mp4, sample file

[Larry Reznick]

Richard Sotke wrote:
> Am Mittwoch, 7. November 2007 17:54:46 schrieb Larry Reznick:
>   
>> Carl Eugen Hoyos wrote:
>>     
>>> Hi!
>>>
>>> Daniel Kirsten <Daniel.Kirsten <at> gmx.net> writes:
>>>       
>>>> I put a sample file at
>>>> http://www.informatik.uni-leipzig.de/~kirsten/movie.mp4
>>>>         
>>> It works as you expect with -demuxer lavf
>>>
>>> Could the sample be moved to samples.mplayerhq.hu/mov/resolution.mov ?
>>>
>>> Thank you, Carl Eugen
>>>       
>> Hi, Carl.
>>
>> That works around the problem. However, MPlayer does recognize the file
>> format as Quicktime/MOV, so why doesn't it interpret the data correctly,
>> as VLC did? It still seems that there's some MPlayer data handling error
>> for it to be confused or sidetracked by whatever is in that file where
>> VLC didn't get confused.
>>
>> --Larry
>>     
>
> In the meta data(moov box) of the file mp4 file, the Width and Height in the 
> TrackHeaderBox and MPEGVisualSampleDescriptionBox is 320x240. You can take a 
> look at it with:
>
> MP4Box -diso movie.mp4
>
> The information from the moov box doesn't fit with the DecoderSpecificInfo.
> If you remux the file with:
>
> MP4Box -add movie.mp4 movie_remuxed.mp4
>
> the problem will disappear. 
>
> Regards
> Richard 

That suggests the file was created with the wrong information. I wonder 
if this means that VLC probed further into the file's structure, 
discovered the 640x480 setting, and applied it to the whole clip.

--Larry