=====AVOuputFormat=====
Defined in ''avformat.h''

<code c>
typedef struct AVOutputFormat {
    const char *name;
    const char *long_name;
    const char *mime_type;
    const char *extensions; /**< comma separated filename extensions */
    /** size of private data so that it can be allocated in the wrapper */
    int priv_data_size;
    /* output support */
    enum CodecID audio_codec; /**< default audio codec */
    enum CodecID video_codec; /**< default video codec */
    int (*write_header)(struct AVFormatContext *);
    int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
    int (*write_trailer)(struct AVFormatContext *);
    /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
    int flags;
    /** currently only used to set pixel format if not YUV420P */
    int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
    int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);

    /**
     * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
     * the arrays are all CODEC_ID_NONE terminated
     */
    const struct AVCodecTag **codec_tag;

    /* private fields */
    struct AVOutputFormat *next;
} AVOutputFormat;
</code>
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