vp8/mt: flush worker thread, not application thread context, on seek.

This prevents a crash when seeking.

1 files changed, 6 insertions, 3 deletions

diff --git a/libavcodec/pthread.c b/libavcodec/pthread.c
index 77e072d96a..e546c21ddd 100644
--- a/libavcodec/pthread.c
+++ b/libavcodec/pthread.c
@@ -747,9 +747,12 @@ void ff_thread_flush(AVCodecContext *avctx)
     if (!avctx->thread_opaque) return;
 
     park_frame_worker_threads(fctx, avctx->thread_count);
-
-    if (fctx->prev_thread)
-        update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
+    if (fctx->prev_thread) {
+        if (fctx->prev_thread != &fctx->threads[0])
+            update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
+        if (avctx->codec->flush)
+            avctx->codec->flush(fctx->threads[0].avctx);
+    }
 
     fctx->next_decoding = fctx->next_finished = 0;
     fctx->delaying = 1;