Cai, Xin wrote:
> Hi
> so I am experimenting with trying to grab video(mjpeg) from an IP webcam and
> I am using the Stepehen Dranger's tutorial01 as my starting point and I know
> that in his program he does a call av_find_stream_info to retrieve the stream
> information. Now I tried to feed the url of the ip webcam into his program
> and it fails at av_find_stream_info (which is expected because when I try to
> grab video from this IP camera using ffplay I have to do a -f mjpg to specify
> an input format).
You can specify an input format when invoking av_open_input_file():
/**
* Open a media file as input. The codecs are not opened. Only the file
* header (if present) is read.
*
* @param ic_ptr The opened media file handle is put here.
* @param filename filename to open
* @param fmt If non-NULL, force the file format to use.
* @param buf_size optional buffer size (zero if default is OK)
* @param ap Additional parameters needed when opening the file
* (NULL if default).
* @return 0 if OK, AVERROR_xxx otherwise
*/
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
AVInputFormat *fmt,
int buf_size,
AVFormatParameters *ap);
(look at the "fmt" parameter).
Luca
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