diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 12d0196947..9f65340d93 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -1677,7 +1677,7 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
 
 #if FF_API_AVCTX_TIMEBASE
         if (avctx->framerate.num > 0 && avctx->framerate.den > 0)
-            avctx->time_base = av_inv_q(avctx->framerate);
+            avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
 #endif
     }
 end:
@@ -2391,7 +2391,7 @@ fail:
 
 #if FF_API_AVCTX_TIMEBASE
     if (avctx->framerate.num > 0 && avctx->framerate.den > 0)
-        avctx->time_base = av_inv_q(avctx->framerate);
+        avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
 #endif
 
     return ret;