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• how to stream live videos with no latency (ffplay, mplayer) and what kind of wrapper could be used with ffplay ?

  10 juin 2015, par user573014

  I have been testing playing multiple live streams using different players because I wanted to get the lowest latency value. I tried gstreamer player (gst-launch-0.01), mplayer, totem and ffmpeg player (ffplay). I used different configuration values to get the lowest latency for each of them for example :

  ffplay -fflags nobuffer 
  
  mplayer -benchmark

  The protocol I am streaming with is udp and I am getting a better values with ffplay than mplayer or gst-launch. To be honest, I don’t know what kind of configuration I need to do it the gstreamer to get a lower latency.
  Now, what I need is two things :

  1. I would like to know if someone has a better suggestion about streaming a live stream with lower latency < 100 ms. I am now getting higher than 100 ms which is not really efficient for me.

  2. Since I am using ffplay currently, because it is the best so far. I would like to do a simple gui with a play and record button and 3 screens to stream from different video servers, I just don’t know what kind of wrapper (which should be really fast) to use !

• ffmpeg rotating source video and applying overlay images [on hold]

  22 janvier 2014, par Drime

  I'm having some trouble with this, I've got a source video that has been recorded upside down. I need this video to be rotated and have a couple of transparent PNG files overlayed on top of it. I'm using this command :

  ffmpeg -i Upside_Down.mov -r 1 -i overlays_%d.png -c:v libx264 -r 30 -pix_fmt yuv420p -filter_complex "overlay=0:0" output.mkv

  The above command works perfectly but keeps my source video upside down obviously, I know rotation can be achieved by -vf vflip:hflip but that doesn't seem to work. Is there a way to achieve this goal or is the only option to flip the source video and apply the overlay in a second run i.e. first do ffmpeg -i Upside_Down.mov -vf vflip:hflip then run the code code above upon completion ?

  Thanks for your help !

• Convert .mp3 to .mov or .mp4 on iOS SDK [on hold]

  3 août 2014, par Sebastian

  I’m a little stuck with an mp3 conversion.

  At this time, my app does the following :

  1. Receive an input text.
  2. The app generate a speech using an online API and download the generated .mp3 file to the app document’s folder.

  Now I need to convert the .mp3 to .mov or .mp4 and then grab it to the camera roll, so the user can share the video on Facebook, Whatsapp, or wherever he wants.

  Is there some easy and memory friendly way to convert from .mp3 to .mp4 without "writing a video" ?
  Thank you !