[Ffmpeg-devel] [PATCH] Targa encoder

[Bobby Bingham]

Benjamin Larsson wrote:
> Bobby Bingham skrev:
>> Kostya wrote:
>>> On Wed, Mar 14, 2007 at 08:07:36PM +0900, Bobby Bingham wrote:
>>> [...]
>>>>> Problem is that quicktime can't decode generated bitstream.
>>>>> you can test encoder by using
>>>>>
>>>>> ffmpeg -i file -vcodec targa test.mov
>>>>>
>>>> I'm on linux, so I don't have quicktime for testing.  I did test 
>>>> with mplayer, and ffplay with the patch applied, and both played 
>>>> fine in my tests.  I'll try to get quicktime going under wine or 
>>>> something for testing.
>>>
>>> Lavc decoder expect general picture format and will work on standalone
>>> pictures too (ffmpeg -i file -f image2 -vcodec targa %05d.tga) while
>>> QuickTime may expect only some subset. Try to compare your output with
>>> samples here:
>>> http://openquicktime.sf.net/files.php/aletrek/
>>>
>>
>> I've compared against those, and the only obvious differences I see are:
>>
>> 1) my files don't claim to have a color map (which the spec says is 
>> the right thing to do for true-color images).  those files claim to 
>> have a zero-item color map.
>>
>> 2) my files aren't RLE compressed
>>
>> 3) my files have the footer at the end, which those don't.
>>
>> I've tried changing all these things about my encoder, and the result 
>> still doesn't play in quicktime.  But interestingly enough, if you use 
>> the command line you gave above (ffmpeg -i file -f image2 -vcodec 
>> targa %05d.tga), quicktime's picture viewer will display the resulting 
>> still targa images just fine.  I'll try to take a further look at it 
>> tomorrow.
>>
> 
> Hi, this openquicktime code should produce quicktime compatible files. 
> Check and see if you can find any obvious diffrences.
> 
> http://openquicktime.cvs.sourceforge.net/openquicktime/OpenQuicktime/videoplugins/tga/codec_tga.c?revision=1.5&view=markup 
> 
> http://openquicktime.cvs.sourceforge.net/openquicktime/OpenQuicktime/videoplugins/tga/tga.h?revision=1.1&view=markup 
> 
> 

I'll try to take more of a look at why quicktime won't decode it in mov 
(seems to work in avi fine), but I doubt that source will help.  That 
source implements decoding, but the encode_tga() function is just a 
dummy function that doesn't do anything.

But I still find it strange that it plays it back fine when in avi, but 
not in mov.

> MvH
> Benjamin Larsson
> 
> 
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-- 
Bobby Bingham
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