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• 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.

• avformat/hls : add http_multiple option

  13 décembre 2017, par Aman Gupta

  avformat/hls : add http_multiple option
  This improves network throughput of the hls demuxer by avoiding
  
  the latency introduced by downloading segments one at a time.
  The problem is particularly noticable over high-latency network
  
  connections : for instance, if RTT is 250ms, there will a 250ms idle
  
  period between when one segment response is read and the next one
  
  starts.
  The obvious solution to this is to use HTTP pipelining, where a
  
  second request can be sent (on the persistent http/1.1 connection)
  
  before the first response is fully read. Unfortunately the way the
  
  http protocol is implemented in avformat makes implementing pipleining
  
  very complex.
  Instead, this commit simulates pipelining using two separate persistent
  
  http connections. This has the advantage of working independently of
  
  the http_persistent option, and can be used with http/1.0 servers as
  
  well. The pair of connections is swapped every time a new segment starts
  
  downloading, and a request for the next segment is sent on the secondary
  
  connection right away. This means the second response will be ready and
  
  waiting by the time the current response is fully read.
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  
  Signed-off-by : Anssi Hannula <anssi.hannula@iki.fi>
  

  • [DH] doc/demuxers.texi
  • [DH] libavformat/hls.c