Set discard flag on all unselected streams (#166)

Set discard flag on all unselected streams

Author: lukasf

FFmpegInterop/FFmpegInteropMSS.cpp

@@ -783,6 +783,8 @@ HRESULT FFmpegInteropMSS::InitFFmpegContext()
 	for (unsigned int index = 0; index < avFormatCtx->nb_streams; index++)
 	{
 		auto avStream = avFormatCtx->streams[index];
+		avStream->discard = AVDISCARD_ALL; // all streams are disabled until we enable them
+
 		MediaSampleProvider^ stream;
 
 		if (avStream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && !config->IsFrameGrabber && !config->IsExternalSubtitleParser)

FFmpegInterop/MediaSampleProvider.cpp

@@ -301,13 +301,15 @@ void MediaSampleProvider::EnableStream()
 {
 	DebugMessage(L"EnableStream\n");
 	m_isEnabled = true;
+	m_pAvStream->discard = AVDISCARD_DEFAULT;
 }
 
 void MediaSampleProvider::DisableStream()
 {
 	DebugMessage(L"DisableStream\n");
 	Flush();
 	m_isEnabled = false;
+	m_pAvStream->discard = AVDISCARD_ALL;
 }
 
 void MediaSampleProvider::SetCommonVideoEncodingProperties(VideoEncodingProperties^ videoProperties, bool isCompressedFormat)