Commit 49d2d1c3 authored by Diego Biurrun's avatar Diego Biurrun

Explain why the level variable is magically inceased in mpeg4_encode_dc().

It must be in a certain range to avoid DC overflows.

Originally committed as revision 21087 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent d3c01751
......@@ -242,6 +242,7 @@ void ff_clean_mpeg4_qscales(MpegEncContext *s){
static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
{
#if 1
/* DC will overflow if level is outside the [-255,255] range. */
level+=256;
if (n < 4) {
/* luminance */
......
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