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• gstreamer android error : engine.GetInterface(IODeviceCapabilities) failed(0x0000000c)

  19 juin 2015, par omerjerk

  I’m trying to stream mpegts file on an Android device. This is the file.

  I’ve setup everything as done in the tutorial 5 of gstreamer android.
  But I’m getting the following error -

  06-18 23:56:49.023  27051-27132/kuchbhilabs.chestream D/GStreamer+tutorial-4﹕ 0:00:03.720735780 0xac093980 src/main/jni/main.c:104:set_ui_message Setting message to: Buffering 66%
  
  06-18 23:56:49.023  27051-27132/kuchbhilabs.chestream D/GStreamerPlayer﹕ Buffering 66%
  
  06-18 23:56:49.551  27051-27350/kuchbhilabs.chestream W/GStreamer+mpegtsbase﹕ 0:00:04.248340259 0xaec6d6f0 mpegtsbase.c:1379:query_upstream_latency:<tsdemux0> Failed to query upstream latency
  
  06-18 23:56:49.555  27051-27350/kuchbhilabs.chestream W/GStreamer+mpegtsbase﹕ 0:00:04.252435571 0xaec6d6f0 mpegtsbase.c:531:mpegts_base_program_add_stream Stream already present !
  
  06-18 23:56:49.762  27051-27351/kuchbhilabs.chestream W/libOpenSLES﹕ Leaving Object::GetInterface (SL_RESULT_FEATURE_UNSUPPORTED)
  
  06-18 23:56:49.762  27051-27351/kuchbhilabs.chestream E/GStreamer+opensles_sink﹕ 0:00:04.459898644 0xaec6e400 openslessink.c:152:_opensles_query_capabilities:&lt;gstopenslessink@0xac3d8408&gt; engine.GetInterface(IODeviceCapabilities) failed(0x0000000c)
  
  06-18 23:56:49.763  27051-27351/kuchbhilabs.chestream W/libOpenSLES﹕ Leaving OutputMix::GetDestinationOutputDeviceIDs (SL_RESULT_BUFFER_INSUFFICIENT)
  
  06-18 23:56:49.810  27051-27351/kuchbhilabs.chestream E/GStreamer+ffmpeg﹕ 0:00:04.507782029 0xaec6e400 :0: channel element 0.0 is not allocated
  
  06-18 23:56:49.810  27051-27351/kuchbhilabs.chestream W/GStreamer+ffmpeg﹕ 0:00:04.507919477 0xaec6e400 gstffmpegdec.c:2231:gst_ffmpegdec_audio_frame: error: Decoding of AAC stream by FFMPEG failed.
  
  06-18 23:56:49.811  27051-27351/kuchbhilabs.chestream W/GStreamer+ffmpeg﹕ 0:00:04.508238122 0xaec6e400 gstffmpegdec.c:2315:gst_ffmpegdec_frame: ffdec_aac: decoding error (len: -1, have_data: 0)
  
  06-18 23:56:49.811  27051-27132/kuchbhilabs.chestream D/GStreamer+tutorial-4﹕ 0:00:04.508278070 0xac093980 src/main/jni/main.c:104:set_ui_message Setting message to: Error received from element ffdec_aac0: Could not decode stream.
  
  06-18 23:56:49.811  27051-27132/kuchbhilabs.chestream D/GStreamerPlayer﹕ Error received from element ffdec_aac0: Could not decode stream.
  
  06-18 23:56:49.878  27051-27352/kuchbhilabs.chestream W/GStreamer+ffmpeg﹕ 0:00:04.575771665 0xaec6e460 gstffmpegdec.c:2315:gst_ffmpegdec_frame: ffdec_h264: decoding error (len: -1, have_data: 0)
  
  </tsdemux0>

  This is my Android.mk file :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE    := chestream
  
  LOCAL_SRC_FILES := main.c
  
  LOCAL_SHARED_LIBRARIES := gstreamer_android
  
  LOCAL_LDLIBS := -llog -landroid
  
  include $(BUILD_SHARED_LIBRARY)
  
  
  
  ifndef GSTREAMER_SDK_ROOT
  
  ifndef GSTREAMER_SDK_ROOT_ANDROID
  
  $(error GSTREAMER_SDK_ROOT_ANDROID is not defined!)
  
  endif
  
  GSTREAMER_SDK_ROOT        := $(GSTREAMER_SDK_ROOT_ANDROID)
  
  endif
  
  GSTREAMER_NDK_BUILD_PATH  := $(GSTREAMER_SDK_ROOT)/share/gst-android/ndk-build/
  
  include $(GSTREAMER_NDK_BUILD_PATH)/plugins.mk
  
  GSTREAMER_PLUGINS         := $(GSTREAMER_PLUGINS_CORE) $(GSTREAMER_PLUGINS_PLAYBACK) $(GSTREAMER_PLUGINS_CODECS) $(GSTREAMER_PLUGINS_NET) $(GSTREAMER_PLUGINS_SYS)\
  
  mpeg2dec mpegdemux2 mpegtsdemux mpegtsmux ffmpeg
  
  GSTREAMER_EXTRA_DEPS      := gstreamer-interfaces-0.10 gstreamer-video-0.10
  
  include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer.mk

  The error is probably that gstreamer is not able to decode AAC file.
  Any help would be appreciated.

• ffmpeg - Audio not playing on iOS with transcoded video

  23 juin 2015, par Dev

  I am using Laravel 4.2.

  I am working on a project that provides video services. To transcode video (to play on all devices) I’ve used git-hub package php ffmpeg.

  By transcoding video, I found it is NOT working with iPhone 5s. I searched for solution and found some changes in parameters passed to the library.

  Finally, I come up with the command below that the library uses to transcode the video.

  ffmpeg -y -i video.mp4 -async 1 -metadata:s:v:0 start_time=0 -s 560x320 
  
      -vcodec libx264 -strict experimental -pix_fmt yuv420p -profile:v baseline 
  
      -acodec aac -profile:a aac_low -b:v 466k -refs 6 -coder 1 -sc_threshold 40 
  
      -flags +loop -me_range 16 -subq 7 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 
  
      -trellis 1 -b:a 256k -ac 2 transcode_video.mp4

  The video is playing well but the audio is NOT working on iOS. Hence the video is playing without audio. I am using HTML 5 player to play the video and auto play option is off.

  Any suggestions ?

• iOS Libavcodec - Trim and convert a video

  14 juillet 2015, par AnujAroshA

  In my iOS project, I am trying to take an .mp4 video file, cut out a small clip in the middle of the file, and convert the output to .mov file. I am using libavcodec to do this.

  I built the FFmpeg libraries for iOS using this script and added to my project.

  The code I am using to trim and convert the video file is this.

  The issues with final output of the file are :

  1. When I copy the output from the iPhone to my mac, the video meta data for duration and video dimensions are blank. If I do the same for the original, I get the video length and dimensions correctly. I must not be creating the video meta data on the new video correctly.

  2. The frame rate on the outputted video appears to be wrong. I expect to see e.g. 250 frames over 10 seconds (25fps), but instead I see 250 frames over 4 seconds, then only the last frame for the remaining 6 seconds.

  3. The code should seek to 100s in the video before starting trimming. Instead, the code appears to crop the video starting at the beginning.