transcode: don't care other tracks drift when calculating pts

Also don't care input fps and only calculate what should be the
next output pts. We anyway define output fps to be either 25fps
or input fps if it's available.

This should help to eliminate skips/visual artefacts on video if
there is small skips in input. And output constans fps from transcode.

Fixes #10453 for me

modules/stream_out/transcode/video.c

@@ -547,13 +547,9 @@ static void transcode_video_encoder_init( sout_stream_t *p_stream,
         id->p_encoder->fmt_in.video.i_frame_rate_base );
 
     id->i_output_frame_interval = id->p_encoder->fmt_out.video.i_frame_rate_base * CLOCK_FREQ / id->p_encoder->fmt_out.video.i_frame_rate;
-    id->i_input_frame_interval = id->p_decoder->fmt_out.video.i_frame_rate_base * CLOCK_FREQ / id->p_decoder->fmt_out.video.i_frame_rate;
-    msg_Info( p_stream, "input interval %d (base %d)  output interval %d (base %d)", id->i_input_frame_interval, id->p_decoder->fmt_out.video.i_frame_rate_base,
+    msg_Info( p_stream, "output interval %d (base %d)",
                         id->i_output_frame_interval, id->p_encoder->fmt_in.video.i_frame_rate_base );
 
-    date_Init( &id->interpolated_pts,
-               id->p_decoder->fmt_out.video.i_frame_rate,
-               1 );
     date_Init( &id->next_output_pts,
                id->p_encoder->fmt_in.video.i_frame_rate,
                1 );
@@ -666,6 +662,7 @@ static void OutputFrame( sout_stream_sys_t *p_sys, picture_t *p_pic, sout_stream
 {
 
     picture_t *p_pic2 = NULL;
+    mtime_t original_date = p_pic->date;
     bool b_need_duplicate=false;
     /* If input pts + input_frame_interval is lower than next_output_pts - output_frame_interval
      * Then the future input frame should fit better and we can drop this one 
@@ -674,7 +671,7 @@ static void OutputFrame( sout_stream_sys_t *p_sys, picture_t *p_pic, sout_stream
      * pictures but we don't need to use them all, for example yadif2x and outputting to some
      * different fps value
      */
-    if( ( p_pic->date + (mtime_t)id->i_input_frame_interval ) <
+    if( ( p_pic->date ) <
         ( date_Get( &id->next_output_pts ) ) )
     {
 #if 0
@@ -741,7 +738,7 @@ static void OutputFrame( sout_stream_sys_t *p_sys, picture_t *p_pic, sout_stream
 
     /* we need to duplicate while next_output_pts + output_frame_interval < input_pts (next input pts)*/
     b_need_duplicate = ( date_Get( &id->next_output_pts ) + id->i_output_frame_interval ) <
-                       ( date_Get( &id->interpolated_pts ) );
+                       ( original_date );
 
     if( p_sys->i_threads )
     {
@@ -786,7 +783,7 @@ static void OutputFrame( sout_stream_sys_t *p_sys, picture_t *p_pic, sout_stream
 #endif
         date_Increment( &id->next_output_pts, id->p_encoder->fmt_in.video.i_frame_rate_base );
         b_need_duplicate = ( date_Get( &id->next_output_pts ) + id->i_output_frame_interval ) <
-                           ( date_Get( &id->interpolated_pts ) );
+                           ( original_date );
     }
 
     if( p_sys->i_threads && p_pic2 )
@@ -897,41 +894,12 @@ int transcode_video_process( sout_stream_t *p_stream, sout_stream_id_t *id,
                 id->b_transcode = false;
                 return VLC_EGENERIC;
             }
-            date_Set( &id->interpolated_pts, p_pic->date );
             date_Set( &id->next_output_pts, p_pic->date );
         }
 
         /*Input lipsync and drop check */
         if( p_sys->b_master_sync )
         {
-            /* How much audio has drifted */
-            mtime_t i_master_drift = p_sys->i_master_drift;
-
-            /* This is the pts input should have now with constant frame rate */
-            mtime_t i_pts = date_Get( &id->interpolated_pts );
-
-            /* How much video pts is ahead of calculated pts */
-            mtime_t i_video_drift = p_pic->date - i_pts;
-
-            /* Check that we are having lipsync with input here */
-            if( unlikely ( ( (i_video_drift - i_master_drift ) > MASTER_SYNC_MAX_DRIFT
-                          || (i_video_drift + i_master_drift ) < -MASTER_SYNC_MAX_DRIFT ) ) )
-            {
-                msg_Warn( p_stream,
-                    "video drift too big, resetting sync %"PRId64" to %"PRId64,
-                    (i_video_drift + i_master_drift),
-                    p_pic->date
-                    );
-                date_Set( &id->interpolated_pts, p_pic->date );
-                date_Set( &id->next_output_pts, p_pic->date );
-                i_pts = date_Get( &id->interpolated_pts );
-            }
-
-            /* Set the pts of the frame being encoded */
-            p_pic->date = i_pts;
-
-
-
             /* If input pts + input_frame_interval is lower than next_output_pts - output_frame_interval
              * Then the future input frame should fit better and we can drop this one 
              *
@@ -977,9 +945,6 @@ int transcode_video_process( sout_stream_t *p_stream, sout_stream_id_t *id,
                 if( !p_user_filtered_pic )
                     break;
 
-                /* now take next input pts, pts dates are only enabled if p_module is set*/
-                date_Increment( &id->interpolated_pts, id->p_decoder->fmt_out.video.i_frame_rate_base );
-
                 OutputFrame( p_sys, p_user_filtered_pic, p_stream, id, out );
 
                 p_filtered_pic = NULL;