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• 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.

• How can I convince ffserver to save a locally-sourced webcam stream to a file in high resolution AND stream it in lower resolution ?

  2 novembre 2015, par Dominic Jacobssen

  We have a remote Linux machine, accessible over VPN, which has a USB webcam. We want to use this for video conferencing, but we also want to store the stream for archiving.

  Since the streaming bandwidth is limited, it makes sense to capture the stream on the same machine as the webcam and rsync that across after-the-fact, rather than trying to capture the streamed content, which is necessarily going to be poor quality.

  We’re trying to use ffmpeg and ffserver to achieve this, but with little success. Most of the articles on the internet either deal with just streaming a webcam, or rebroadcasting a remote stream. We found we had to recompile ffserver because of a missing "my_addr->sin_family = AF_INET ;" in the version of ffserver.c we had been using, since fixed in git.

  Here’s the ffserver.conf we’re trying to use :

  Port 43688
  
  BindAddress 127.0.0.1
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 1000
  
  CustomLog -
  
  NoDaemon
  
  <feed>
  
  ReadOnlyFile /tmp/feed.ffm
  
  FileMaxSize 20M
  
  ACL allow 127.0.0.1
  
  </feed>
  
  <stream>
  
  Feed feed.ffm
  
  Format mp4
  
  VideoSize qvga
  
  VideoGopSize 12
  
  VideoHighQuality
  
  Video4MotionVector
  
  VideoCodec libx264
  
  VideoBitRate 100
  
  VideoBufferSize 40
  
  VideoFrameRate 5
  
  VideoQMin 3
  
  VideoQMax 31
  
  AudioCodec libfaac
  
  AudioBitRate 32
  
  AudioChannels 2
  
  AudioSampleRate 22050
  
  ACL allow localhost
  
  </stream>

  When we fire this up, we get the error :

  Unable to create feed file '/tmp/feed.ffm' as it is marked readonly

  Fair enough, but this is not what is implied in the docs. Changing the directive to :

  File /tmp/feed.ffm

  allows ffserver to fire up and appear to sit and wait for ffmpeg to connect to it. However, when we fire up ffmpeg with the command :

  ffmpeg -f alsa -i pulse -r 16000 -f video4linux2 -s qvga -i /dev/video0 -r 5 -f mp4 -vcodec libx264 -sameq -acodec libfaac -ab 32k http://127.0.0.1:43688/feed.ffm

  then the webcam lights up and ffserver acknowledges the connection with the messages :

  New connection: POST /feed.ffm
  
  [POST] "/feed.ffm HTTP/1.1" 200 0

  but after a few seconds we get the errors :

  [mp4 @ 0x264b160] muxer does not support non seekable output
  
  Could not write header for output file #0 (incorrect codec parameters ?)

  We’ve tried various other formats (mpeg, mpegts, avi) and codecs (mpeg1video, mpeg2video, mpeg4), all without success.

  Moreover, we were under the impression that ffserver could reencode input format to a lower resolution for streaming, but if the stream resolution doesn’t match the feed resolution, we get an error about the resolutions not matching.

  Has anyone ever managed to get this working correctly ? I’ve read about vlc being able to do something like this, but the vlc command lines are well nigh impenetrable.

  Thanks !

  Dominic