diff --git a/toxav/toxav.c b/toxav/toxav.c
index 67fec65d..a51ec5e3 100644
--- a/toxav/toxav.c
+++ b/toxav/toxav.c
@@ -460,6 +460,12 @@ int toxav_prepare_video_frame ( ToxAv *av, int32_t call_index, uint8_t *dest, in
         return av_ErrorInvalidState;
     }
 
+    if (!(call->cs->capabilities & cs_VideoEncoding)) {
+        pthread_mutex_unlock(call->mutex);
+        LOGGER_WARNING("Call doesn't support encoding video: %d", call_index);
+        return av_ErrorInvalidState;
+    }
+
     if (cs_set_video_encoder_resolution(call->cs, input->w, input->h) < 0) {
         pthread_mutex_unlock(call->mutex);
         return av_ErrorSettingVideoResolution;