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Avoid segfault for empty input files
Originally committed as revision 20265 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -469,6 +469,12 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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/* read probe data */
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pd->buf= av_realloc(pd->buf, probe_size + AVPROBE_PADDING_SIZE);
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pd->buf_size = get_buffer(pb, pd->buf, probe_size);
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if ((int)pd->buf_size < 0) {
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err = pd->buf_size;
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goto fail;
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}
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memset(pd->buf+pd->buf_size, 0, AVPROBE_PADDING_SIZE);
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if (url_fseek(pb, 0, SEEK_SET) < 0) {
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url_fclose(pb);
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