avfilter: Read errno before av_log() as the callback from av_log() might affect errno

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 2 insertions, 1 deletions

diff --git a/libavfilter/vf_vidstabdetect.c b/libavfilter/vf_vidstabdetect.c
index bf067afaf9..1df6f74f4e 100644
--- a/libavfilter/vf_vidstabdetect.c
+++ b/libavfilter/vf_vidstabdetect.c
@@ -176,8 +176,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
         return AVERROR(AVERROR_EXTERNAL);
     } else {
         if (vsWriteToFile(md, sd->f, &localmotions) != VS_OK) {
+            int ret = AVERROR(errno);
             av_log(ctx, AV_LOG_ERROR, "cannot write to transform file");
-            return AVERROR(errno);
+            return ret;
         }
         vs_vector_del(&localmotions);
     }