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• Video Processing via Bluetooth

  16 juillet 2012, par kerim yucel

  The application I am currently developing processes each frames using a native code and it should record the video as well. I tried SDK for this purpose but certain restrictions didn't allow me to do so, so I switched to NDK for a video recording code piece.

  Apparently, my algorithm seriously uses CPU, upto %70 percent in the worst case. Before I actually start working on a video recorder, I wanted to try the following approach.

  I will process the preview frames using an android phone and send it to another phone (which uses same application and same model) for recording. My questions are :

  1.Should I try WiFi instead of Bluetooth ? I am developing the application for API 8 so I don't have WiFi-Direct, therefore I should do some socket programming, which would possibly complicate things a bit for me since Bluetooth can easily be set up using SDK.

  2- Will I be available to record the frames as a video at the receiving end ? I will receive each frame with certain metadata embedded to it and should record them using the other phone. I doubt I will be able to do it using SDK, so NDK along with ffmpeg seems to be the best choice ? Any suggestions related to this question will be more than welcome.

  3-Here comes the best part. I am recording the video with the lowest resolution that,after compressed, takes no more than 14mb space for a 10 minute long video. I have to reach the raw frames to send it to other end, encode and compress it. Any ideas related to possible flooding of Bluetooth/Wi-Fi because of big-sized raw frames ?

  Any other approaches and answers will be much appreciated. Thanks.

• RTSP stream emulator with variable playback speed [closed]

  31 janvier 2021, par foyife

  I would like to build an application very similiar to an existing one. It is an IP camera emulator that makes RTSP streams from local video files.

  


  What I need in addition are options to control the video with an API while the stream is running. Some examples for that :

  


  

  • Skipping to a certain timestamp of the video

  


  • Change the playback speed

  


  • Play the video in reverse

  


  


  Unfortunately, I have very little experience in video streaming and it seems to be a rare use case for ffmpeg or gstreamer. Maybe someone could give me a hint on which library might be best for this application ? Thanks !

  


• RTMP server - without watermarks everything works fine --- with watermark one stream will not work nginx ffmpeg overlay watermark

  10 juin 2021, par Ashley Taylor

  okay so i used the below config and everything works great both youtube and facebook work .

  


  rtmp {
    server {
        listen 1935;
        chunk_size 8192;
        application live {
        record off;
        live on;
        push rtmp://a.rtmp.youtube.com/live2/djfghjkdfhgkjsdfglsjdfhj;
                push rtmp://127.0.0.1:19350/rtmp/453uy4uty8ryt85ty85yt8; (facbook)
                    }
    
        }
    

    }


  


  Now i have tried 2 seprate way to add a water mark (Youtube works fine Every time)
Facebook does not stream at all let alone with a watermark

  


  examples i have tried below

  


  rtmp {
server {
    listen 1935;
    chunk_size 8192;
    application live {
    record off;
    live on;
            exec /bin/ffmpeg  -i rtmp://127.0.0.1:1935/live/$name
             -vf "movie=/etc/nginx/images/logo.png[logo];[0][logo]overlay=0:300"
             -c:v libx264 -f flv rtmp://127.0.0.1:1935/push/$name;
              }

    application push {
    live on;
    push rtmp://a.rtmp.youtube.com/live2/djfghjkdfhgkjsdfglsjdfhj;
            }
   }
}


  


  and another

  


  rtmp {
server {
    listen 1935;
    chunk_size 8192;
    application live {
    record off;
    live on;
            exec /bin/ffmpeg  -i rtmp://127.0.0.1:1935/live/$name
             -vf "movie=/etc/nginx/images/logo.png[logo];[0][logo]overlay=0:300"
             -c:v libx264 -f flv rtmp://127.0.0.1:1935/push/$name;
    
                    exec /bin/ffmpeg  -i rtmp://127.0.0.1:1935/live/$name
             -vf "movie=/etc/nginx/images/logo.png[logo];[0][logo]overlay=0:300"
             -c:v libx264 -f flv rtmp://127.0.0.1:1935/pushh/$name;
            }

    application push {
    live on;
    push rtmp://a.rtmp.youtube.com/live2/djfghjkdfhgkjsdfglsjdfhj;
            }

            application pushh {
            live on;
            push rtmp://127.0.0.1:19350/rtmp/453uy4uty8ryt85ty85yt8;
            }
   }
}


  


  Now for the life of me i just cannot get my brain to work.
i am very new to rtmp and have tried a dozen other ways before coming here for help.

  


  i know this is going to be something i where i am making such a simple mistake

  


  but on the other hand paying over $49 for restream.io for a shoddy service i just have to learn this for my own servers