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• Streaming jpegs live to iphone app

  14 février 2012, par Raven

  Im progressing through taking the depth camera feed from my kinect and streaming it to my iphone app. I have got to stage of being able save jpegs for every frame created from the kinect depth image (30 fps) and save them to the local disk. I have than been able to convert this to mpeg with ffmpeg.

  My question is now how can I view this live on my iphone ? Basically I want to view it live on the iphone as you are seeing it coming from the kinect.

  Should I use http live streaming and use the segmenter to use apples HttpLiveStreaming functionality ? Or can I stream the raw jpeg image files up in some way as they are saved to disk and than just cycle the images on the phone as they go ?

  Im wondering how video conferencing is achieved on the iphone (facetime/skype etc) ? because I'd prefer that it wasnt played inside the video player, just want to display live content on the screen as it happens.

  Any ideas ? Thanks in advance

• Recording application output to video using FFmpeg (or similar)

  15 décembre 2011, par John

  We have a requirement to lets users record a video of our 3D application. I can already grab the individual rendered frames so this question is specifically about how to write frames into a video file.

  I don't think writing each frame as a separate file and post-processing is a workable option.

  I can look at options to record to a simple video file for later optimising/encoding, or writing directly to a sensibly encoded format.

  FFmpeg was suggested in another post but it looks a bit daunting to me. Is it the best option, if not what can be suggested ? We can work with LGPL but not full GPL.

  We're working on Windows (Win32 not MFC) in C++. Sample/pseudo code with your recommended library is very much appreciated... basically after how to do 3 functions :

  • startRecording() does whatever initialization is needed
  • recordFrame() takes pointer to frame data and encodes it, ideally with timing data
  • endRecording() finalizes the video file, shuts down video system, etc

• undefined reference to `__stack_chk_guard'

  20 décembre 2011, par moose

  I'm trying to debug the ffmpeg (0.8.7) on x86 Windows OS.
  When I run configure with the -fstack-protector-all and -fstack-check I get this in config.log :

  gcc -mms-bitfields -fstack-protector-all -fstack-check -I/home/moose/x264 -c -o /tmp/ffconf.AZMYgppf.o /tmp/ffconf.NLPWVejs.c
  gcc -Wl,—add-stdcall-alias -L/c/installs/x264/x264-snapshot-20111206-2245 -o /tmp/ffconf.ZgseLpWd.exe /tmp/ffconf.AZMYgppf.o /c/installs/x264/x264-snapshot-20111206-2245/libx264.a
  C :/DOCUME 1/moose/LOCALS 1/Temp/ffconf.AZMYgppf.o:ffconf.NLPWVejs.c :(.text+0x2f) : undefined reference to

  __stack_chk_guard'
C:/DOCUME~1/moose/LOCALS~1/Temp/ffconf.AZMYgppf.o:ffconf.NLPWVejs.c:(.text+0x44): undefined reference to

  __stack_chk_guard'
  C :/DOCUME 1/moose/LOCALS 1/Temp/ffconf.AZMYgppf.o:ffconf.NLPWVejs.c :(.text+0x4b) : undefined reference to `__stack_chk_fail'
  collect2 : ld returned 1 exit status
  C compiler test failed.

  Where did I fail ?

  EDIT :
  I can't answer my own question, so I'll add the comment here :

  Solved.. I had to link it against the libssp.a
  However, there is no change with these two swiches (-fstack-protector-all and -fstack-check ) at all :-(