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• OpenCV stream captured CAM with H264 (mp4) codec

  28 août 2015, par user1200794

  I like to stream the web cam pictures wich are captured by opencv. I think about a solution with ffmpeg and live555 (poorly they are not document so well). My problems are :

  1. How can convert the captured images to a H264 format so the picures/second match. If it is in a loop I get more than 25 pictures/sekond and the video is to fast.

  2. How can i directly stream the converted H264 stream over the network via rtp / rtps or similar.

  Thanks for your help !

• How to convert RTSP stream into flv/swf Stream (w. ffmpeg) ?

  22 octobre 2012, par acy

  I want embed a webcam stream (From geovision video server) into a website. Unfortunately only the rtsp stream gives direct access to the video data.

  I tried a bunch of different variants. With this version I got no errors :

  openRTSP -b 50000 -w 352 -h 288 -f 5 -v -c -u admin password rtsp://xxxxxx.dyndns.org:8554/CH001.sdp | \
  
  ffmpeg -r 5 -b 256000 -f mp4 -i - http://127.0.0.1:8090/feed1.ffm

  Unfortunately I get no video. Sometimes I see a single frame of the webcam, but no livestream.

  This is my ffserver.conf

  Port 8090
  
  BindAddress 0.0.0.0
  
  MaxClients 200
  
  MaxBandwidth 20000
  
  CustomLog /var/log/flvserver/access.log
  
  
  
  NoDaemon
  
  
  
  # Server Status
  
  <stream>
  
  Format status
  
  </stream>
  
  
  
  <feed>
  
  File /tmp/feed1.ffm
  
  FileMaxSize 200K
  
  ACL allow 127.0.0.1
  
  </feed>
  
  
  
  # SWF output - great for testing
  
  <stream>
  
   # the source feed
  
   Feed feed1.ffm
  
   # the output stream format - SWF = flash
  
   Format swf
  
   #VideoCodec flv
  
   # this must match the ffmpeg -r argument
  
   VideoFrameRate 5
  
   # another quality tweak
  
   VideoBitRate 256K
  
   # quality ranges - 1-31 (1 = best, 31 = worst)
  
   VideoQMin 1
  
   VideoQMax 3
  
   VideoSize 352x288
  
   # wecams don&#39;t have audio
  
   NoAudio
  
  </stream>

  What am I doing wrong ? THe test.swf seems to load forever...

• Use ffmpeg to add text subtitles

  25 novembre 2016, par 0-alpha

  I am trying to add text subtitles to an .mp4 container using ffmpeg :

  ffmpeg -i input.mp4 -i input.srt -map 0.0 -map 0.1 -map 1.0 output.mp4

  When I am trying to run this line, it gives me an error :

  Nmber of stream maps must match number of output streams.

  If I try to change the mp4 to mkv (although mp4 supports text subtitles), like this :

  ffmpeg -i input.mp4 -i input.srt -map 0.0 -map 0.1 -map 1.0 output.mkv

  It correctly maps the streams, but gives an error :

  Encoder (codec id 94210) not found for output stream #0.2

  When I launch

  ffmpeg -codecs

  I can see that srt codec is supported as decoder and encoder, however I am not sure what is used for mp4 and mkv subs encoding, and whether I need to switch it on or compile separately.