diff --git a/app/codec/ffmpeg/ffmpegdecoder.cpp b/app/codec/ffmpeg/ffmpegdecoder.cpp
index d2292f002..6bff06232 100644
--- a/app/codec/ffmpeg/ffmpegdecoder.cpp
+++ b/app/codec/ffmpeg/ffmpegdecoder.cpp
@@ -350,6 +350,13 @@ FootageDescription FFmpegDecoder::Probe(const QString &filename, CancelAtom *can
 
     int64_t footage_duration = fmt_ctx->duration;
 
+    bool bad_duration = false;
+
+    if (fmt_ctx->duration_estimation_method == AVFMT_DURATION_FROM_BITRATE) {
+      bad_duration = true;
+      qWarning() << "Potentially bad duration estimation, using fallback. This could be slow.";
+    }
+
     // Dump it into the Footage object
     for (unsigned int i=0;i<fmt_ctx->nb_streams;i++) {
 
@@ -409,8 +416,8 @@ FootageDescription FFmpegDecoder::Probe(const QString &filename, CancelAtom *can
 
               if (ret >= 0) {
                 // Check if we need a manual duration
-                if (avstream->duration == AV_NOPTS_VALUE) {
-                  if (footage_duration == AV_NOPTS_VALUE) {
+                if (avstream->duration == AV_NOPTS_VALUE || bad_duration) {
+                  if (footage_duration == AV_NOPTS_VALUE || bad_duration) {
 
                     // Manually read through file for duration
                     int64_t new_dur;
@@ -468,9 +475,9 @@ FootageDescription FFmpegDecoder::Probe(const QString &filename, CancelAtom *can
             channel_layout = static_cast<uint64_t>(av_get_default_channel_layout(avstream->codecpar->channels));
           }
 
-          if (avstream->duration == AV_NOPTS_VALUE) {
+          if (avstream->duration == AV_NOPTS_VALUE || bad_duration) {
             // Loop through stream until we get the whole duration
-            if (footage_duration == AV_NOPTS_VALUE) {
+            if (footage_duration == AV_NOPTS_VALUE || bad_duration) {
               Instance instance;
               instance.Open(filename_c, avstream->index);