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• Programmatically creating mpd stream using Python

  3 février 2021, par mifol68042

  I have a live feed using RTSP from an IP camera that is captured using OpenCV in my python code. I capture every frame run some object detection on it and then need to show this in my angular front end.

  


  Initially I had thought to create an RTMP stream in my code and then use that in angular app but then realised that RTMP support is EOL on browsers. Now the alternative to this is that I am planning to create a stream using MPEG Dash. When researching about this, found this link to create a manifest mpd file however the examples there have no mention of the frames or video file. On researching more, I realised we could do something like this :

  


  ffmpeg -i $INPUT.mp4 \
-map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 \
-b:v:0 250k -filter:v:0 "scale=-2:240" -profile:v:0 baseline \ 
-b:v:1 750k -filter:v:1 "scale=-2:480" -profile:v:1 main \    
-use_timeline 1 -use_template 1 -window_size 5 \
-adaptation_sets "id=0,streams=v id=1,streams=a" -f dash $OUTPUT.mpd


  


  This is from command line but how can I achieve this programmatically ??? Also how do I keep updating the mp4 to get a live stream ??

  


  In short, I want to understand how to create live feed using frames via MPEG Dash.

  


• FFMPEG HLS streaming and transcoding 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.

• 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.