Recherche avancée

Sur d’autres sites (6654)

• Real Time indoor streaming and music mixing

  9 novembre 2015, par Saneet

  I am working on this project where we are doing a live performance with about 6 musicians placed away from each other in a big space. The audience will be wearing their headphones and as they move around we want them to hear different kinds of effects in different areas of the place. For calculating the position of users we are using bluetooth beacons. We’re expecting around a 100 users and we can’t have a latency of more than 2 seconds.

  Is such kind of a setup possible ?

  The current way we’re thinking of implementing this is that we’ll divide the place into about 30 different sections.
  For the server we’ll take the input from all the musicians and mix a different stream for every section and stream it on a local WLAN using the RTP protocol.
  We’ll have Android and iOS apps that will locate the users using Bluetooth beacons and switch the live streams accordingly.

  Presonus Studio One music mixer - Can have multiple channels that can be output to devices. 30 channels.
  Virtual Audio Cable - Used to create virtual devices that will get the output from the channels. 30 devices.
  FFMpeg streaming - Used to create an RTP stream for each of the devices. 30 streams.

  Is this a good idea ? Are there other ways of doing this ?
  Any help will be appreciated.

• 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.

• Fixing a TS file made by the HD Home Run

  2 mars 2015, par clive alton

  I am recording from a cable stream using the hdhomerun command line tool, hdhomerun_config, to a .ts file. The way it works is that you run the command, it produces periods every second or so to let you know that the stream is being successfully recorded. So when I record, it produces only periods, which is desired. And the way to end it is by doing a Ctrl-C. However, whenever I try to convert this to an avi or a mov using FFMpeg, it gives a bunch of errors, some of which being

  [mpeg2video @ 0x7fbb4401a000] Invalid frame dimensions 0x0
  
  [mpegts @ 0x7fbb44819600] PES packet size mismatch
  
  [ac3 @ 0x7fbb44015c00] incomplete frame

  It still creates the file, but it is bad quality and it doesn’t work with OpenCV and other services. Has anyone else encountered this problem ? Does anyone have any knowledge that may help with this situation ? I tried to trim the ts file but most things require conversion before editing. Thank you !