FFmpeg Multiple Vulnerabilities

Multiple vulnerabilities have been identified in FFmpeg, where some have an unknown impact and others can be exploited by malicious people to cause a DoS (Denial of Service).

1. A NULL pointer dereference error within the "decode_mb_info()" function (libavcodec/indeo4.c) can be exploited to cause a crash.
2. An out-of-bounds read error within the "decode_band_hdr()" function (libavcodec/indeo4.c) can be exploited to cause a crash.
3. Another out-of-bounds read error within the "decode_band_hdr()" function (libavcodec/indeo4.c) can be exploited to cause a crash.
4. Some errors exist when applying certain transform.