Subject: [libav-devel] [PATCH 1/2] vaapi: return early from ff_vaapi_render_picture() without picture
From: Janne Grunau janne-libav at jannau.net

Fixes an assertion when called on uninitialized frame. Spotted after
seeking in vlc. (backported from libav mailing list)

---

diff --git a/lib/ffmpeg/libavcodec/vaapi.c b/lib/ffmpeg/libavcodec/vaapi.c
index a220a9d..94959bf 100644
--- a/lib/ffmpeg/libavcodec/vaapi.c
+++ b/lib/ffmpeg/libavcodec/vaapi.c
@@ -46,6 +46,9 @@ int ff_vaapi_render_picture(struct vaapi_context *vactx, VASurfaceID surface)
     VABufferID va_buffers[3];
     unsigned int n_va_buffers = 0;
 
+    if (!vactx->pic_param_buf_id)
+        return 0;
+
     vaUnmapBuffer(vactx->display, vactx->pic_param_buf_id);
     va_buffers[n_va_buffers++] = vactx->pic_param_buf_id;
 
