[Ffmpeg-devel] PixelFormat error
Tue Jun 21 16:41:36 CEST 2005
Chang Min Jeon wrote:
> I'm trying to encode mpeg1.
> int saveTofile()
> AVCodecContext *c = NULL;
> c->get_format = PIX_FMT_YUV420P;
> error message :
> error: cannot convert `PixelFormat' to `PixelFormat (*)(AVCodecContext*,
> const PixelFormat*)' in assignment
> I can't understand that error message.
You're trying to pass an integer where a function pointer was expected.
* callback to negotiate the pixelFormat.
* @param fmt is the list of formats which are supported by the codec,
* its terminated by -1 as 0 is a valid format, the formats are
* the first is allways the native one
* @return the choosen format
* - encoding: unused
* - decoding: set by user, if not set then the native format will
always be choosen
enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum
PixelFormat * fmt);
(Hint: Next time you get an error message like this, avcodec.h is a good
place to look to get an idea of what might be going on.)
But, most likely, you don't want to mess with get_format anyway.
c->pix_fmt tells you which format the codec expects (on encoding) and
delivers (on decoding). For MPEG-1 (as for most other codecs), it's
PIX_FMT_YUV420P. So, as you seem to be enoding, just pass a YUV420 image
to your codec, and everything should be fine. If the images you have are
in a different format, use img_convert.
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