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• How do I upscale an iOS App Preview video to 1080 x 1920 ?

  30 août 2016, par Benjamin Thiel

  I just captured a video of my new app running on an iPhone 6 using QuickTime Player and a Lightning cable. Afterwards I created an App Preview project in iMovie, exported it and could successfully upload it to iTunes Connect.

  Apple requires developers to upload App Previews in different resolutions dependent on screen size, namely :

  • iPhone 5(S) : 1080 x 1920 or 640 x 1136
  • iPhone 6 : 750 x 1334 (what I have)
  • iPhone 6+ : 1080 x 1920

  Obviously, 1080 x 1920 is killing two birds with one stone. I know that upscaling isn’t the perfect solution, but it’s meeting my needs. Since I don’t own a 6+, another recording session won’t do the trick.

  Unfortunately, iTunes Connect is extremely picky about what to accept. Here’s what I tried, to no avail :

  • Handbrake, iMovie, QuickTime do not support upscaling
  • MPEG Streamclip
  • ffmpeg -i input.mp4 -acodec copy -vf scale=1080:1920 output.mp4

  Strangely enough, iTunes Connect keeps complaining about the wrong resolution when I try to upload the output.mp4 of ffmpeg.

• Mobile Camera live audio/video streaming and encoding

  7 juin 2015, par Strikecounter2

  I know this question has been asked a couple of times, but I still haven’t found the right answer for my question.

  I would like to code an app that is able to live-stream audio and video while the content is being recorded and then uploaded to a server. I’d prefer to have my own back-end using Parse, because I want a high scalability. I know that the video has to be encoded to a h.264 codec and the audio to an AAC codec, but I don’t know how to achieve this. I have heard of the FFmpeg framework, but I am not sure if I would violate their license if I distribute my app or even sell it to somebody else.
  I would then like to receive the stream from the server to open it on the iPhone/android phone.

  They key requirements would be :

  • Low Latency
  • About 24 fps
  • Audio/Video in sync
  • No buffering while watching

  I would like to use Swift as a programming language, but if there is no way to use a swift-wrapper for any frameworks I would focus on Objective-C too.

  I am willing to learn everything that is needed, but I don’t know where to start.

• 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.