video: fix coverity scans issues in video accel

Change-Id: Ibc239cfca4eb96e115080f57184768625b3e800f
Tuleap: #1524

src/media/video/accel.h

@@ -56,7 +56,7 @@ class HardwareAccel {
         virtual void extractData(VideoFrame& input, VideoFrame& output) = 0;
 
     protected:
-        AVCodecContext* codecCtx_;
+        AVCodecContext* codecCtx_ = nullptr;
         std::string name_;
         AVPixelFormat format_;
         unsigned failCount_ = 0; // how many failures in a row, reset on success

src/media/video/v4l2/vaapi.cpp

@@ -142,7 +142,7 @@ VaapiAccel::init()
         return false;
     }
 
-    VAProfile codecProfile;
+    VAProfile codecProfile = VAProfileNone;
     auto itOuter = profileMap.find(codecCtx_->codec_id);
     if (itOuter != profileMap.end()) {
         auto innerMap = itOuter->second;

src/media/video/v4l2/vaapi.h

@@ -71,12 +71,12 @@ class VaapiAccel : public HardwareAccel {
         AVBufferRefPtr deviceBufferRef_;
         AVBufferRefPtr framesBufferRef_;
 
-        VAProfile vaProfile_;
-        VAEntrypoint vaEntryPoint_;
-        VAConfigID vaConfig_;
-        VAContextID vaContext_;
+        VAProfile vaProfile_ = VAProfileNone;
+        VAEntrypoint vaEntryPoint_ = VAEntrypointVLD;
+        VAConfigID vaConfig_ = -1;
+        VAContextID vaContext_ = -1;
 
-        struct vaapi_context ffmpegAccelCtx_;
+        struct vaapi_context ffmpegAccelCtx_ = {};
 
         std::string deviceName_;
 };