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-rw-r--r--libavcodec/vp6.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/libavcodec/vp6.c b/libavcodec/vp6.c
index 6d5d46b0f0..139105de19 100644
--- a/libavcodec/vp6.c
+++ b/libavcodec/vp6.c
@@ -19,6 +19,11 @@
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ *
+ * The VP6F decoder accept an optional 1 byte extradata. It is composed of:
+ * - upper 4bits: difference between encoded width and visible width
+ * - lower 4bits: difference between encoded height and visible height
*/
#include <stdlib.h>