xcbgrab: Support empty filename string correctly
Bug-Id: CID 1254664 CC: libav-stable@libav.org
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@ -594,10 +594,10 @@ static av_cold int xcbgrab_read_header(AVFormatContext *s)
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int screen_num, ret;
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const xcb_setup_t *setup;
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c->conn = xcb_connect(s->filename, &screen_num);
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c->conn = xcb_connect(s->filename[0] ? s->filename : NULL, &screen_num);
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if ((ret = xcb_connection_has_error(c->conn))) {
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av_log(s, AV_LOG_ERROR, "Cannot open display %s, error %d.\n",
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s->filename ? s->filename : "default", ret);
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s->filename[0] ? s->filename : "default", ret);
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return AVERROR(EIO);
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}
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setup = xcb_get_setup(c->conn);
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