@@ -199,6 +199,12 @@ static av_cold int a64multi_init_encoder(AVCodecContext *avctx)

     c->mc_colram        = av_mallocz(CHARSET_CHARS * sizeof(uint8_t));

     c->mc_charset       = av_malloc (0x800 * (INTERLACED+1) * sizeof(uint8_t));

+    /* set up extradata */

+    avctx->extradata      = av_mallocz(8 * 4 + FF_INPUT_BUFFER_PADDING_SIZE);

+    avctx->extradata_size = 8 * 4;

+    AV_WB32(avctx->extradata, c->mc_lifetime);

+    AV_WB32(avctx->extradata+16, INTERLACED);

+

     avcodec_get_frame_defaults(&c->picture);

     avctx->coded_frame            = &c->picture;

     avctx->coded_frame->pict_type = FF_I_TYPE;

@@ -243,6 +249,10 @@ static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf,

     int *meta            = c->mc_meta_charset;

     int *best_cb         = c->mc_best_cb;

+    int charset_size = 0x800 * (INTERLACED + 1);

+    int screen_size  = 0x400;

+    int colram_size  = 0x100 * c->mc_use_5col;

+

     /* no data, means end encoding asap */

     if (!data) {

         /* all done, end encoding */

@@ -314,6 +324,10 @@ static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf,

             charmap += 1000;

         }

+        AV_WB32(avctx->extradata+4,  c->mc_frame_counter);

+        AV_WB32(avctx->extradata+8,  charset_size);

+        AV_WB32(avctx->extradata+12, screen_size + colram_size);

+

         /* reset counter */

         c->mc_frame_counter = 0;