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• Is it possible to send a temporary slate (image or video) into a running Azure Live Event RTMP-stream ?

  15 novembre 2020, par Brian Frisch

  I'm currently building a video streaming app which leverages Azure Media Services Live Events.

  


  It consists of :

  


  

  1. a mobile app that can stream live video and.

  


  2. a web client that plays the live event video.

  


  3. a producer screen with controls to start and stop the web client access to the video.

  


  4. a server that handles various operations around the entire system

  


  


  It's working very well, but I would like to add a feature that would enable the producer to add some elegance to the experience. Therefore I'm trying to get my head around how I can enable the producer be able to switch the incoming source of the stream to a pre-recorded video or event a still image at any point during the recording, and also to switch back to live-video. A kill-switch of some kind, that would cover waiting-time if there's technical difficulties on the set, and it could also be used for pre-/post-roll branding slates when introing and outroing a video event. I would like this source switch to be embedded in the video stream (also so it would be possible to get this into the final video-product if I need it in an archive for later playback)

  


  I'm trying to do it in a way where the producer can set a timestamp for when the video override should come in, and when it should stop. The I want to have my server respond to these timestamps and send the instructions over RTMP to the Azure Live Event. Is it possible to send such an instruction ("Hey, play this video-bit/show this image in the stream for x-seconds") in the RTMP-protocol ? I've tried to figure it out, and I've read about SCTE-35 markers and such, but I have not been able to find any examples on how to do it, so I'm a bit stuck.

  


  My plan-B is to make it possible to stream an image from the mobile application that already handles the live video-stream, but I'm initially targeting an architecture where the mobile app is unaware of anything else than live streaming, and this override switch should preferably be handled by the server, which is a firebase functions setup.

  


  If you are able to see other ways of doing it, I'm all ears.

  


  I've already tried to build a ffmpeg method that listens to updates to the producer-set state, and then streams an image to the same RTMP-url that the video goes to from the mobile app. But it only works when the live video isn't already streaming - it seems like I cannot take over a RTMP-stream when it's already running.

  


• How do I live transcode a wmv file for playback in html5 player ?

  14 octobre 2018, par steven

  I’ve been working at this for quite awhile and still haven’t found a solution that works. I need a way to live convert (transcode) a .wmv file for playback in a html5 web player.

  I have a linux server (Apache) setup to stream video files through an html5 web player (Video.js) designed for Chrome and Firefox browsers. The file types I am dealing with are .mp4 (H.264), .mkv, and .wmv. The good news for me is that I can deal with mp4 and mkv natively, however I can’t play wmv. Also, I have to deal with a lot of files, change periodically, and can be quite large.

  After doing a lot of research and reading many times how you can’t stream wmv directly, I came to the realization that I had two options. Either convert the file to a supported format or live transcode a file for use in the web player. Due to the amount of files and their size (and periodically changing) converting the file is simply not feasible. So I am stuck with live streaming/transcoding. I figured ffmpeg would be the way to go, but I have yet to figure out how to get ffmpeg to live stream into the html5 player.

  So how do I take an existing .wmv file and live stream it in an html5 player ?

  The things I’ve tried so far :

  Tried creating a m3u8 playlist and hoping it would magically work.

  ffmpeg -i "hello.wmv" -s 640x480 -c:v libx264 -f ssegment -hls_flags delete_segments -segment_list playlist.m3u8 -segment_list_type hls -segment_list_size 10 -segment_list_flags +live -segment_time 10 out_%6d.ts

  Simply copying to mp4 and streaming while ffmpeg still progressing. Obviously didn’t work.

  ffmpeg -i "hello.wmv"  -vcodec copy video.mp4

  Converting to webm format and streaming webm while ffmpeg still progressing. This actually did show the video for a few seconds in the html player :

  ffmpeg -i "hello.wmv" -codec:a libvorbis -codec:v libvpx -b:a 128k -b:v 1200k video.webm

  Ffmpeg is not required to be used (was thinking of vlc as well), the html5 player is required. Completely converting then streaming isn’t a viable option because file sizes can be too large and change periodically. What command/program can I use to stream the file for playback in the html player ?

• Capturing and processing a live RTMP stream

  8 février 2018, par Yantor

  I’m trying to download a live stream (not a file) coming from a live camera feed available at the following website : http://www.dot.ca.gov/video/.

  I used Wireshark for sniffing the TCP packets and was able to extract the RTMP parameters, but wasn’t able to use them with FFMPEG/VLC for downloading / playing the stream on VLC (I guess I didn’t construct the URL correctly).

  for example, for the camera feed available here, I got the following parameters :

  swfUrl : http://www.dot.ca.gov/research/its/StrobeMediaPlayback.swf

  pageUrl : http://www.dot.ca.gov/d4/d4cameras/ct-cam-pop- N17_at_Saratoga_Rd.html

  tcUrl : rtmp ://wzmedia.dot.ca.gov:1935/D4
  Play : E37_at_Lakeville_Rd.stream.

  Is there a chance someone is familiar with this and can help with understanding how I can use the above for downloading the stream ?

  Thanks a lot ! Yaniv