@@ -164,6 +164,7 @@ static int debug = 0;

 static int debug_mv = 0;

 static int me_threshold = 0;

 static int mb_threshold = 0;

+static int intra_dc_precision = 0;

 extern int loop_input; /* currently a hack */

 static int gop_size = 12;

@@ -2893,6 +2894,7 @@ static void opt_output_file(const char *filename)

                 video_enc->idct_algo = idct_algo;

                 video_enc->me_threshold= me_threshold;

                 video_enc->mb_threshold= mb_threshold;

+                video_enc->intra_dc_precision= intra_dc_precision;

                 video_enc->strict_std_compliance = strict;

                 video_enc->error_rate = error_rate;

                 video_enc->noise_reduction= noise_reduction;

@@ -3580,6 +3582,7 @@ const OptionDef options[] = {

     { "qns", HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)opt_qns}, "quantization noise shaping", "" },

     { "sc_threshold", HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)opt_sc_threshold}, "scene change threshold", "threshold" },

     { "me_range", HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)opt_me_range}, "limit motion vectors range (1023 for DivX player)", "range" },

+    { "dc", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_VIDEO, {(void*)&intra_dc_precision}, "intra_dc_precision", "precision" },

     /* audio options */

     { "ab", HAS_ARG | OPT_AUDIO, {(void*)opt_audio_bitrate}, "set audio bitrate (in kbit/s)", "bitrate", },

@@ -17,7 +17,7 @@ extern "C" {

 #define FFMPEG_VERSION_INT     0x000408

 #define FFMPEG_VERSION         "0.4.8"

-#define LIBAVCODEC_BUILD       4710

+#define LIBAVCODEC_BUILD       4711

 #define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT

 #define LIBAVCODEC_VERSION     FFMPEG_VERSION

@@ -1584,6 +1584,13 @@ typedef struct AVCodecContext {

      * - decoding: unused

      */

      int mb_threshold;

+

+    /**

+     * 

+     * - encoding: set by user

+     * - decoding: unused

+     */

+     int intra_dc_precision;

 } AVCodecContext;

@@ -360,7 +360,7 @@ static void common_init(MpegEncContext *s)

 {

     s->y_dc_scale_table=

-    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;

+    s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];

 }

@@ -837,6 +837,27 @@ void ff_mpeg1_encode_init(MpegEncContext *s)

 static inline void encode_dc(MpegEncContext *s, int diff, int component)

 {

+  if(((unsigned) (diff+255)) >= 511){

+        int index;

+

+        if(diff<0){

+            index= av_log2_16bit(-2*diff);

+            diff--;

+        }else{

+            index= av_log2_16bit(2*diff);

+        }

+        if (component == 0) {

+            put_bits(

+                &s->pb, 

+                vlc_dc_lum_bits[index] + index,

+                (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));

+        }else{

+            put_bits(

+                &s->pb, 

+                vlc_dc_chroma_bits[index] + index,

+                (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));

+        }

+  }else{

     if (component == 0) {

         put_bits(

 	    &s->pb, 

@@ -848,6 +869,7 @@ static inline void encode_dc(MpegEncContext *s, int diff, int component)

 	    mpeg1_chr_dc_uni[diff+255]&0xFF,

 	    mpeg1_chr_dc_uni[diff+255]>>8);

     }

+  }

 }

 static void mpeg1_encode_block(MpegEncContext *s, 

@@ -890,6 +890,7 @@ int MPV_encode_init(AVCodecContext *avctx)

     s->quarter_sample= (avctx->flags & CODEC_FLAG_QPEL)!=0;

     s->mpeg_quant= avctx->mpeg_quant;

     s->rtp_mode= !!avctx->rtp_payload_size;

+    s->intra_dc_precision= avctx->intra_dc_precision;

     if (s->gop_size <= 1) {

         s->intra_only = 1;

@@ -4009,7 +4010,7 @@ static int encode_thread(AVCodecContext *c, void *arg){

     for(i=0; i<3; i++){

         /* init last dc values */

         /* note: quant matrix value (8) is implied here */

-        s->last_dc[i] = 128;

+        s->last_dc[i] = 128 << s->intra_dc_precision;

         s->current_picture_ptr->error[i] = 0;

     }