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• FFMPEG HLS streaming and transcodding on the fly to HTML player - video duration changes while transcoding

  20 août 2019, par Thomas Tho

  I am trying to make a video streaming server and watch videos directly from web browser. The idea is to make the server to stream video from remote server, transcode with different audio format in local server, and then instantly stream to the client (this is specific way I need it to function).
  This is the FFMPEG code im currently using :

  ffmpeg -i "url" -c:v copy -c:a aac -ac 2 -f hls -hls_time 60 -hls_playlist_type event -hls_flags independent_segments out.m3u8

  The HLS stream is attached to the HTML player with hls.js and it works. However, the video duration is constantly changing while video is being transcoded. I have tried to change video duration with JS like $('video').duration = 120;with no luck.

  How do i make the player to display the video file duration instead of stream current transcoded time ?

  I am also planning to implement video seeking but i am clueless. The current idea is to send seeking time to the server, terminate ffmpeg, and start from specific time. However, i think the player might get stuck on loading and will not start playing without reloading.

• images->video->web canvas : RGB/YUV issues

  5 février 2016, par nrob

  We’ve written an web app which :

  1. takes 3D, time dependent weather data
  2. tiles each 3D time point to make a 2D frame (written out as a png image)
  3. stitches these frames together into a video (using ffmpeg/avconv)
  4. streams this video into a web app
  5. polls the canvas for frames
  6. sends the frames to the GPU where they are converted back to 3D and ray traced

  You can see the app here, code here and you can see the data video here

  Currently the pngs are written as RGB images, the video codec is in YUV and getting frames from the canvas returns RGB. As such there is a significant loss of information due to the conversion between image spaces.

  Does anyone have suggestions what is the best way round this ?

  I’ve tried a bunch of RGB video codecs, but I can’t get any to work, and I don’t know if the web browser will support it anyway. Can anyone suggest a good RGB codec (both lossy and lossless would be great)

  Also, is it possible to write to YUV images/read them from a video canvas in HTML5 ?

  Ultimately, I don’t even want anything to do with images/videos, I’m just hacking the codecs to stream/compress large animated 3D data volumes

• Stream Video from Raspberry Pi to my Webpage

  21 septembre 2016, par velu4689

  I want to live stream the video captured on my SJ 4000 Camera.

  The Camera is Connected to my Rpi by Wi-Fi and the stream is available using the following address : rtsp ://192.168.1.254/sjcam.mov

  Now, I want to watch this stream in my webpage by using a Streaming Engine on Raspberry Pi.

  The rtsp ://Camera addr works when I Connected the Camera directly to my Windows PC and attempted using VLC. But I wanted to do it by using Rpi as the streaming engine.

  I have attempted the following :

  1) Using ffmpeg -i "rtsp ://[IP_ADDR]" -vcodec -f http://[my_pc_IP_ADDR]
  But am getting an error message "Unable to find a suitable output format for ’http://192.168.55.39:5678".

  2) Installed OMX Player. But I do not find proper material to stream using OMX Player.

  3) Have come across GStreamer. But still the same problem..I did not find proper material.

  Kindly provide your valuable inputs.

  Thanks.