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• FFmpeg option to generate a .m4s file every second

  29 janvier 2020, par Adrian Angkajaya

  I am trying to stream my live recording from a camera (web cam/ ip cam) to my web application. The streaming technique I use is MPEG-DASH, which has manifest in MPD format. To generate an MPD format from the web-cam, I use FFmpeg tool in shell command line :
  ffmpeg -re -y -f dshow -i video="Logitech HD Webcam C525" -c:v libx264 -c:a libfdk_aac -f dash "manifest.mpd". This code will generate a video chunk in .m4s format every 5-8 seconds.

  Question is, what FFmpeg option can I use to generate a .m4s file every second instead of every 5-8 seconds ? I suppose it has something to do with segment ?

• How to segment audio and video to the same segments number ?

  24 décembre 2019, par julian zapata

  I’ve extracted audio and video from the same mp4 file and created different variants for different resolutions. When I segment the videos and the audio file with MP4Box, the video segments are the same segments number but the audio segments have one more. I need the video and audio segments to be the same number to use with dash.

  I’m using the next commands to produce the video and audio files :

  Command to extract the audio from mp4 file :

  ffmpeg -y -i "transformers.mp4" -c:a aac -b:a 192k -vn "transformers_audio.m4a"

  Produce each variant of the video with the next command modifying the resolution and bitrate parameters :

  ffmpeg -i transformers.mp4 -c:v libx264 -r 24 -x264opts "keyint=48:min-keyint=48:no-scenecut" -an -vf scale=640:360 -b:v 750k -dash 1 transformers_640x360_750k.mp4

  Generate the mpd file and segment the videos and audio each 4 seconds with :

  mp4box -dash 4000 -profile "dashavc264:live" -bs-switching no -sample-groups-traf \ 
  
  -out output4\ 
  
  transformers.mpd \ 
  
  transformers_480x270_400k.mp4 \ 
  
  transformers_640x360_800k.mp4 \ 
  
  transformers_960x540_1200k.mp4 \
  
  transformers_1280x720_1500k.mp4 \ 
  
  transformers_1920x1080_4000k.mp4 \
  
  transformers_audio.m4a

  This produces 36 segments for each variant of the video and 37 for the audio. How to solve this little variation ? How to make the audio segments number exactly the number of video segments ?

• RTMP streaming without flash and low latency

  4 juin 2020, par Ruben Sanchez Castellano

  I have a server that currently streams out RTMP media and I need to play it with minimum delay (2-3 seconds).
Now I'm using CRTMPServer to consume the stream but, since there is no RTMP player without flash dependency, this solutions does not work for me because I need to play it embedded into a web page.

  



  At this point, I tried Nimble Streamer but I only could consume HLS, DASH and SLDP. HLS and DASH has 10 second delay so I discard these approaches.
SLDP has low latency but is a closed protocol and there is only one player (closed but freeware).

  



  On the other hand, there is RTSP but there are no HTML5 players for it. But I couldn't consume RTSP streams from Nimble neither.

  



  Any other ideas ?