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• Using PNG (which updates) as a source for an RTMP live stream

  24 juillet 2023, par pkSML

  I've been googling a lot lately trying but I have yet to find a solution.

  


  I've been using OBS to stream some textual data, where it grabs some data from a webpage and dynamically updates. This is easy, but involves way more overhead and CPU usage than I want. So cue up the command line and FFMPEG. I've gotten a script that'll update this textual information for me and save as a PNG. It updates every 10 seconds. The PNG file is 1280x720.

  


  All I want on my RTMP stream is this image (with audio). But I can't figure out how to use only a PNG as the source of a video stream.

  


  This does NOT work :
ffmpeg -re -y -framerate 1 -loop 1 -f image2 -i "./image.png" -c:v libx264 -pix_fmt yuv420p -preset fast -r 30 -g 120 -b:v 1000k -bufsize 512k -f flv "rtmps://mydomain.com/endpoint"
This just stalls. The encode time goes nowhere and the frame counter hardly moves.

  


  I want this to be compatible with Facebook Live, so I need the output to be 30 fps with GOPs every few seconds.

  


  Any ideas on how to achieve this ? I could use an overlay, but I'd prefer not to.

  


  Thanks !

  


• How to setup HLS Live Video Streaming from iOS Device

  9 septembre 2017, par Sean

  Good day everyone !

  So, as the title suggests, i am developing an app with similar functionality to that off Periscope and Facebook Live video streaming. Here is what the end goal is :

  • A Broadcasting device [user]
  • EC2 Instance [Hosting an ffmpeg transcoder]
  • Cloudfront Distrubution [CDN]
  • 1 to n viewers of the live feed

  I’ve been doing a lot of googling and what I cant seem to figure out is :

  As you send chunks of video to the server from the Broadcaster, how do
  you create an
  .m3u8 playlist when you don’t have all the chunks of video yet (e.g. the
  device sends its first 5second chunk of video) ?

  It seems a .m3u8 file is created from a .mp4 file that is already complete, then broken down into chunks... But i’m sending chunks of the video to the server, how can it generate the .m3u8 file when more chunks are still coming from the Broadcaster, so the watchers / clients can continuously stitch together the video chunks ?

  I’ll be happy to clarify this question further. Thanks !

• Samples RSS And Flashback Samples

  22 décembre 2011, par Multimedia Mike — Game Hacking, Python

  I made good on my claim that I would create an RSS feed for the samples repository.

  Here is the link to the samples RSS feed [ http://samples.mplayerhq.hu/samples-rss.xml ]. Also, here is the Python source code I threw together for the task.

  I just want to check : I’m not the only person who still relies on RSS these days, right ? The tech press has been cheerfully proclaiming its demise for some time now. But then, they have been proclaiming the same for Adobe Flash as well.

  I’m no expert in RSS. If you have any suggestions for how to improve the features presented in the feed, please let me know. And, of course, keep the samples coming. This script should help provide more visibility for a broader audience.

  Mario and Flashback Samples
  Thanks to LuigiBlood who sent in some samples that allowed me to test out my new script for automatically syncing the repositories and updating the samples RSS feed. First, there are CPC multimedia files from the Japanese 3DO port of Flashback : The Quest for Identity. Then, there is an Interplay MVE file on the CD version of Mario Teaches Typing in which the video doesn’t decode correctly.

  LuigiBlood also sent in another file from the latter game. It’s big and has the extension .AV. It could be a multimedia file as it appears to have a palette and PCM audio inside. But there’s no header and I’m a bit unsure about how to catalog it.