CODEWITHSUNDEEP
cffmpeg
sharpener
sharpener

Reputation: 1853

AVOptions for video size components

There is an option for declaring video size:

av_dict_set(&options, "video_size", "1920x1080", 0);

Are there any equivalent options for the size components? Like:

av_dict_set_int(&options, VIDEO_WIDTH_OPT_STR , 1920, 0);
av_dict_set_int(&options, VIDEO_HEIGHT_OPT_STR, 1080, 0);

What would be the values for those macros (if any)?

#define VIDEO_WIDTH_OPT_STR  "?"
#define VIDEO_HEIGHT_OPT_STR "?"

Please note I'm aware of man snprintf, that's not my concern, thank you.

Upvotes: 0

Views: 164

Answers (1)

aergistal
aergistal

Reputation: 31209

You can add whatever you want in the dictionary, it's just a container. video_size is parsed to two integers for the formats who use it for example. See AV_OPT_TYPE_IMAGE_SIZE in libavutil/opt.c.

You can define your own options (AVOption) for a class. So there's nothing stopping you from adding two options like video_width and video_height and initialize them via a dictionary.

static const AVOption options[] = {
    { "video_width", "frame width", OFFSET(width), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, DEC },
    { "video_height", "frame height", OFFSET(height), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, DEC },
    { NULL }
};

static const AVClass some_class = {
     [...]
     .option     = options,
     [...]
}

where width and height are members of the struct used by your format.

Upvotes: 2

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