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• Swapping FFMPEG input source

  21 novembre 2017, par stevendesu

  I’m using FFMPEG to stream RMTP to a server. I wish to change what I’m streaming without breaking the connection to this server.

  My current FFMPEG command looks like so :

  ffmpeg -f v4l2 -s 1280x720 -r 10 -i /dev/video0 -c:v libx264 -f flv -r 30 -pix_fmt yuv420p "rtmp://server live=true pubUser=user pubPasswd=pass playpath=stream"

  If I wanted to change from /dev/video0 to /dev/video1 then I need to stop this program and re-run the command swapping out the -i bit.

  Since FFMPEG can read from stdin as well as files, I believe it should be possible to switch the input source on the fly by either piping the output of a different program, or utilizing UNIX sockets. There may also be a solution built into FFMPEG which I’m not aware of.

  My question now is : what’s the simplest / least code / most recommended way of switching these inputs ? Is there a third-party tool that’s recommended ? Does FFMPEG have an alternate command-line parameter I’ve never heard of ? If I do use a UNIX socket of stdin, is there a recommended way to change what’s being written to them ?

  One of my concerns is that if I have FFMPEG read in from a UNIX socket and in a separate shell I have a different instance of FFMPEG writing to this UNIX socket, during the brief period when I’m switching sources the first instance of FFMPEG (which is doing the broadcasting) would die, as it couldn’t find any video data to stream.

• Android convert exo to mp4 after download dash

  7 août 2018, par Ali

  I have downloaded a Dynamic Adaptive Streaming over HTTP (DASH) via android DashDownloader class that is provided by exo player.

  SimpleCache cache = new SimpleCache(file.getAbsoluteFile(), new NoOpCacheEvictor());
  
  DefaultHttpDataSourceFactory factory = new DefaultHttpDataSourceFactory("ExoPlayer", null);
  
  DownloaderConstructorHelper constructorHelper = new DownloaderConstructorHelper(cache, factory);
  
  
  
  // Create a downloader for the first representation of the first adaptation set of the first
  
  // period.
  
  DashDownloader dashDownloader = new DashDownloader(Uri.parse(url), Collections.singletonList(new RepresentationKey(0, 0, 0)), constructorHelper);
  
  dashDownloader.download();

  Above code save many chunk .exo files into provided directory, How can i convert this files to single mp4 file ?

• FFMPEG udp input stream and input stream play local file

  15 décembre 2017, par liewjls

  Hoping someone can guide me to the right place. I have a application is being the "middle man" receiving a video stream from a source via UDP and passing this video stream to a ffmpeg instance on a server and record a certain period of the video (without audio), on a certain occasion it will need to play the video from recorded video instead of passing the live video stream to the ffmepg instance on the server.

  /ffmpeg -an -f mpegts -i udp://@:7100/?fifo_size=2000&overrun_nonfatal=1 -analyzeduration 150 -f rawvideo -map 0:0 -vcodec rawvideo -pix_fmt bgra - -af volumedetect -vn -sn -dn -map 0:1 -f mpegts -y -flush_packets 0 udp://127.0.0.1:7208?pkt_size=1316

  I managed to record the video without audio frm Extracting the h264 part of a video file (demuxing)

  The difference is i save the recorded file as "mpegts"

  avformat_alloc_output_context2(&ofmt_ctx_a, NULL,  "mpegts", out_filename_a);

  As soon i need to play from this recorded file, i read every 1316 packets from this file and pass it to the ffmpeg via the localhost port.

  The problem is the ffmpeg seems doesn’t like my recorded file and i noticed it has error msg "DTS 18635855 < 24133055 out of order"

  How do i resolve this issue ?

  Thanks.