Hi Stefano,
Stefano Sabatini wrote:
> On date Wednesday 2008-12-03 13:17:31 +0100, Luca Abeni encoded:
>> Stefano Sabatini wrote:
>>> Hi all,
>>>
>>> the following program is meant to be a basic example of the encoding
>>> decoding libavcodec API.
>>>
>>> The problem is that I *always* got an empty frame when decoding the
>>> frame.
>> This does not happen here: the encdec-dst.pgm file I get is just a
>> "low quality" version of the encdec-src.pgm file. Probably, the rate
>> control mechanism starts encoding the first frame with a low quality
>> (and the image you use as input requires a very high bitrate).
>
> Hi Luca, after three days hitting hard my head on the wall, I finally
> discovered what was going wrong, in attachement there is a working
> version.
>
> And the problem was...
>
> ... that apparently libavcodec wasn't working correctly without to
> first call av_register_all, a libavformat symbol, maybe the problem
> also depends on the fact that I'm using shared libraries.
Uhmmm... I suspect you just forgot to call avcodec_init() ;-)
For some reason, here the program works even if such function is
not called, but generates a low-quality picture.
If I add the call to avcodec_init(), then the picture is encoded
at the correct quality (if I increase the bitrate).
I am linking statically, and I am not linking libavformat.
Luca
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