#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
-#define APM_FILE_HEADER_SIZE 18
+#define APM_FILE_HEADER_SIZE 20
#define APM_FILE_EXTRADATA_SIZE 80
#define APM_EXTRADATA_SIZE 28
int64_t file_size, data_size;
file_size = avio_tell(s->pb);
- data_size = file_size - (APM_FILE_HEADER_SIZE + 2 + APM_FILE_EXTRADATA_SIZE);
+ data_size = file_size - (APM_FILE_HEADER_SIZE + APM_FILE_EXTRADATA_SIZE);
if (file_size >= UINT32_MAX) {
av_log(s, AV_LOG_ERROR,