lavc: don't set AVFrame.pts to random numbers in decoders.

libavcodec/h261dec.c

@@ -476,7 +476,6 @@ static int h261_decode_picture_header(H261Context *h)
     s->picture_number = (s->picture_number & ~31) + i;
 
     s->avctx->time_base      = (AVRational) { 1001, 30000 };
-    s->current_picture.f.pts = s->picture_number;
 
     /* PTYPE starts here */
     skip_bits1(&s->gb); /* split screen off */

libavcodec/ituh263dec.c

@@ -885,7 +885,6 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
     i = get_bits(&s->gb, 8); /* picture timestamp */
     if( (s->picture_number&~0xFF)+i < s->picture_number)
         i+= 256;
-    s->current_picture_ptr->f.pts =
     s->picture_number= (s->picture_number&~0xFF) + i;
 
     /* PTYPE starts here */

libavcodec/mpeg4videodec.c

@@ -1965,14 +1965,6 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
         }
     }
 
-    if(s->avctx->time_base.num)
-        s->current_picture_ptr->f.pts = (s->time + s->avctx->time_base.num / 2) / s->avctx->time_base.num;
-    else
-        s->current_picture_ptr->f.pts = AV_NOPTS_VALUE;
-    if(s->avctx->debug&FF_DEBUG_PTS)
-        av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
-               s->current_picture_ptr->f.pts);
-
     check_marker(gb, "before vop_coded");
 
     /* vop coded */