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--- mpeg4 [2011/02/24 06:38] – suapapa
+++ mpeg4 [2013/08/03 05:04] (current) – external edit 127.0.0.1
@@ Line 34: / Line 34: @@
 </code>
+====== 인코딩시 화면 튀는 문제 ======
+비디오 레코딩 사용 소스 cmds/stagefright를 사용하면 더미를 씀으로 테스트 할 수 있다.
+  *./frameworks/base/cmds/stagefright/record.cpp
+  *./frameworks/base/cmds/stagefright/stagefright.cpp
+  *./frameworks/base/media/libmediaplayerservice/StagefrightRecorder.cpp
+넥서스원 동영상
+<code txt>
+==========================================================================
+Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
+Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
+==========================================================================
+==========================================================================
+Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
+FAAD: compressed input bitrate missing, assuming 128kbit/s!
+AUDIO: 32000 Hz, 2 ch, s16le, 128.0 kbit/12.50% (ratio: 16000->128000)
+Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio))
+==========================================================================
+</code>
+zoom3 동영상
+<code txt>
+==========================================================================
+Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
+Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
+==========================================================================
+==========================================================================
+Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
+FAAD: compressed input bitrate missing, assuming 128kbit/s!
+AUDIO: 16000 Hz, 2 ch, s16le, 128.0 kbit/25.00% (ratio: 16000->64000)
+Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio))
+==========================================================================
+</code>
 ====== 비디오 rotation 정보 ======
-  * 비디오 트랙 헤더에 로테이트 정보가 있는 경우 깨져서 재생됨. omx_il 에 뭔가 빠진게 아닐까??
+ * liboverlay rotation 부분에 똥싸놨음. -_-; 프로요와 비교해 똥싼 부분 찾아보자.
+  * [[http://gitorious.org/blazetablet/hardware-ti-omap3/trees/froyo/liboverlay]]
 ===== encode ======
 frameworks/base/media/libstagefright/MPEG4Writer.cpp: writeCompositionMatrix()에서 받은 각도에 따른 composition matrix를 track header에 붙임.
@@ Line 46: / Line 80: @@
 ===== decode =====
+<code bash>
+[~/workspace/cyanogenmod/frameworks/base/media/libstagefright]
+suapapa $ git grep kKeyRotation
+AwesomePlayer.cpp:                    kKeyRotation, &rotationDegrees)) {
+AwesomePlayer.cpp:                        kKeyRotation, &rotationDegrees)) {
+MPEG4Extractor.cpp:        mLastTrack->meta->setInt32(kKeyRotation, rotationDegrees);
+MPEG4Writer.cpp:    if (!mIsAudio && params && params->findInt32(kKeyRotationDegree, &rotationDegrees)) {
+StagefrightMetadataRetriever.cpp:    if (!trackMeta->findInt32(kKeyRotation, &rotationAngle)) {
+</code>
+AwesomePlayer 에서 frameworks/base/media/libstagefright/AwesomePlayer.cpp
+<code cpp>
+        if (!strncmp("OMX.", component, 4)) {
+            // Our OMX codecs allocate buffers on the media_server side
+            // therefore they require a remote IOMXRenderer that knows how
+            // to display them.
+            mVideoRenderer = new AwesomeRemoteRenderer(
+                mClient.interface()->createRenderer(
+                        mISurface, component,
+                        (OMX_COLOR_FORMATTYPE)format,
+                        decodedWidth, decodedHeight,
+                        mVideoWidth, mVideoHeight,
+                        rotationDegrees));
+        }
+</code>