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void av_freep(void *ptr) Frees memory and sets the pointer to NULL.

It is recommended you call av_freep() instead. You are allowed to call this function with ptr = NULL. Void av_free(void *ptr) Frees memory allocated by av_malloc() or av_realloc(). If the frame is reference counted, it will be unreferenced first. void av_frame_free ( AVFrame **frame) Free the frame and any dynamically allocated objects in it, e.g. It returns >= 0 on success, AVERROR_* on error.ĪVFrame * avcodec_free_frame() Old name for av_frame_free. It's recommended that you call this after opening a file. This is useful for file formats without headers like MPEG. Int av_find_stream_info( AVFormatContext *s, AVDictionary **options) This function searches the stream to find information about it that might not have been obvious like frame rate. It returns 0 on success or AVERROR_NOMEM on failure. This apparently is a hack: if this packet wasn't allocated, we allocate it here. On return this parameter will be destroyed and replaced with a dict containing options that were not found.

Options A dictionary filled with protocol-private options. Int_cb an interrupt callback to be used at the protocols level. Url is the name of the resource to access.įlags flags which control how the resource indicated by url is to be opened. In case of failure the pointed to value is set to NULL. S is the pointer to the place the AVIOContext will be created. Int avio_open2 ( AVIOContext **s, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options) Creates an IO context to use the resource specified by url.

Void avformat_close_input( AVFormatContext **s) Closes a media file. Options: An AVDictionary filled with AVFormatContext and demuxer-private options. Opens a media file filename, stores the format context in the address pointed to by ptr. Text version int avformat_open_input( AVFormatContext **ptr, const char * filename, AVInputFormat *fmt, AVDictionary **options)