ffmpeg: ensure duration detection responds to cancel action

app/codec/ffmpeg/ffmpegdecoder.cpp

@@ -315,6 +315,9 @@ FootageDescription FFmpegDecoder::Probe(const QString &filename, CancelAtom *can
     int64_t footage_duration = fmt_ctx->duration;
 
     bool duration_guessed_from_bitrate = (fmt_ctx->duration_estimation_method == AVFMT_DURATION_FROM_BITRATE);
+    if (duration_guessed_from_bitrate) {
+      qWarning() << "Unreliable duration detected - we will manually determine it ourselves (this may take some time)";
+    }
 
     // Dump it into the Footage object
     for (unsigned int i=0;i<fmt_ctx->nb_streams;i++) {
@@ -383,7 +386,7 @@ FootageDescription FFmpegDecoder::Probe(const QString &filename, CancelAtom *can
 
                     do {
                       new_dur = frame->best_effort_timestamp;
-                    } while (instance.GetFrame(pkt, frame) >= 0);
+                    } while (instance.GetFrame(pkt, frame) >= 0 && (!cancelled || !cancelled->IsCancelled()));
 
                     avstream->duration = new_dur;
 
@@ -447,7 +450,7 @@ FootageDescription FFmpegDecoder::Probe(const QString &filename, CancelAtom *can
 
               do {
                 new_dur = frame->best_effort_timestamp;
-              } while (instance.GetFrame(pkt, frame) >= 0);
+              } while (instance.GetFrame(pkt, frame) >= 0 && (!cancelled || !cancelled->IsCancelled()));
 
               avstream->duration = new_dur;
 

app/node/project/footage/footage.cpp

@@ -474,9 +474,11 @@ void Footage::Reprobe()
           }
         }
 
+        if (!cancelled_ || !cancelled_->HeardCancel()) {
           if (!footage_info.Save(meta_cache_file)) {
             qWarning() << "Failed to save stream cache, footage will have to be re-probed";
           }
+        }
 
       }
 

app/task/project/import/import.cpp

@@ -106,10 +106,15 @@ void ProjectImportTask::Import(Folder *folder, QFileInfoList import, int &counte
 
     } else {
 
-      Footage* footage = new Footage(file_info.absoluteFilePath());
+      Footage* footage = new Footage();
 
+      footage->SetCancelPointer(this->GetCancelAtom());
+
+      footage->set_filename(file_info.absoluteFilePath());
       footage->SetLabel(file_info.fileName());
 
+      footage->SetCancelPointer(nullptr);
+
       if (footage->IsValid()) {
         // See if this footage is an image sequence
         ValidateImageSequence(footage, import, i);