[MEncoder-users] Decoding mjpeg with mencoder

[Dirk Plate]

Hi Reimar,
'-demuxer lavf' in Moritz command works well, but in my command not. 
Maybe a problem in combination with the video-filters or x264-Codec?

Thanks for your detailed description of the errors in this file. These 
files are uploaded to our website by our users. I think there are some 
mobiles or cameras which ignore the rules of an avi-file. ;)
But with your analysis I can explain the users, why we can't convert 
their files.

Thanks again,
Dirk

Reimar Döffinger schrieb:
> On Tue, Nov 10, 2009 at 11:29:10AM +0100, Dirk Plate wrote:
>> If I play the original files with mplayer, it stops with a 'Seek
>> failed' error too. I found a hint that '-demuxer lavf' can solve
>> this problem in mplayer and this works for me too.
>> But in mencoder this parameter has no effect. No 'unknown parameter'
>> error, but the result hasn't changed.
> 
> -demuxer lavf works just fine with mencoder, too. I'd say you must have
> done something wrong when you tried it.
> 
>> You can download a sample file here:
>>
>> http://www.file-upload.net/download-2001649/sample.AVI.html
>>
>> Any tips?
> 
> Flame whoever created it.
> The file is _not_ a valid AVI file.
> In AVI files the chunks (e.g. the stuff that starts with 00dc to mark a
> video frame) _must_ be aligned to be at a file offset that is divisible
> by 2.
> This in addition leads to the AVIIF_LIST flag being set for the index
> entries, causing MPlayer to ignore them.
> I suspect that if you remove the index (e.g. cut away the last few 100 kB)
> not even Windows Media Player will be able to play it.
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