fftools/ffmpeg: Repair reinit_filter feature

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 35040048)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

fftools/ffmpeg.c

@@ -2121,9 +2121,6 @@ static int ifilter_send_frame(InputFilter *ifilter, AVFrame *frame)
 
     /* determine if the parameters for this input changed */
     need_reinit = ifilter->format != frame->format;
-    if (!!ifilter->hw_frames_ctx != !!frame->hw_frames_ctx ||
-        (ifilter->hw_frames_ctx && ifilter->hw_frames_ctx->data != frame->hw_frames_ctx->data))
-        need_reinit = 1;
 
     switch (ifilter->ist->st->codecpar->codec_type) {
     case AVMEDIA_TYPE_AUDIO:
@@ -2137,6 +2134,13 @@ static int ifilter_send_frame(InputFilter *ifilter, AVFrame *frame)
         break;
     }
 
+    if (!ifilter->ist->reinit_filters && fg->graph)
+        need_reinit = 0;
+
+    if (!!ifilter->hw_frames_ctx != !!frame->hw_frames_ctx ||
+        (ifilter->hw_frames_ctx && ifilter->hw_frames_ctx->data != frame->hw_frames_ctx->data))
+        need_reinit = 1;
+
     if (need_reinit) {
         ret = ifilter_parameters_from_frame(ifilter, frame);
         if (ret < 0)