Recherche avancée

Sur d’autres sites (8921)

• Efficient low latency stream forwarding in intel atom

  31 juillet 2017, par Sönke Felsing

  I have a certain problem in forwarding a stream from a web camera to my local network.

  My Network camera provides a RTP video stream 720p24 to NIC1 of my Gateway PC (Intel Atom, 1.8GHz , Ubuntu 16.04). Now I would like to forward this stream to all PCs (Intel i5, i7,...) which are connected to NIC2 of the Gateway PC.

  I tested already some stuff with ffmpeg and VLC. VLC does not even run the Video on the Atom due to Hardware limitatons and ffmpeg is just capable of 1-2fps at 480p, but ffserver works fine. MPlayer at least Shows the Video in all its beauty but does not support Streaming unfortunately.

  Does anybody know a well performing way to get access to the stream of the camera through the Gateway PC without directly connecting the two Networks ? Due to the fact that we would like to make some remote operations there may not be introduced any further latency for buffering, transcoding, ...

  If the Solutions uses multicast I would be happy.

  I really look forward to your responses !

• HLS MP4 Independent Segments

  18 juillet 2017, par Mido

  Long story short : Why HLS can’t just play normal MP4 files together one after one ? Why need to segment media file into .ts segments ?

  Details :

  We’ve segmented MP4 file into mini MP4 segments (not TS), each one about 30 seconds for testing. It never plays in any HLS player, just loading all segment files then nothing happens.

  Example MP4 segment Info :

  Format                      : MPEG-4
  
  Format profile              : Base Media
  
  Codec ID                    : isom
  
  File size                   : 1.44 MiB
  
  Duration                    : 32s 950ms
  
  Overall bit rate            : 366 Kbps
  
  Writing application         : Lavf56.25.101
  
  
  
  Video
  
  ID                          : 1
  
  Format                      : AVC
  
  Format/Info                 : Advanced Video Codec
  
  Format profile              : High@L4.1
  
  Format settings, CABAC      : Yes
  
  Format settings, ReFrames   : 6 frames
  
  Codec ID                    : avc1
  
  Codec ID/Info               : Advanced Video Coding
  
  Duration                    : 32s 950ms
  
  Bit rate                    : 230 Kbps
  
  Width                       : 426 pixels
  
  Height                      : 240 pixels
  
  Display aspect ratio        : 16:9
  
  Original display aspect rat : 16:9
  
  Frame rate mode             : Constant
  
  Frame rate                  : 23.976 fps
  
  Color space                 : YUV
  
  Chroma subsampling          : 4:2:0
  
  Bit depth                   : 8 bits
  
  Scan type                   : Progressive
  
  Bits/(Pixel*Frame)          : 0.094
  
  Stream size                 : 925 KiB (63%)
  
  Writing library             : x264 core 142 r2495 6a301b6
  
  
  
  Audio
  
  ID                          : 2
  
  Format                      : AAC
  
  Format/Info                 : Advanced Audio Codec
  
  Format profile              : LC
  
  Codec ID                    : 40
  
  Duration                    : 32s 896ms
  
  Bit rate mode               : Constant
  
  Bit rate                    : 129 Kbps
  
  Channel(s)                  : 2 channels
  
  Channel(s)_Original         : 6 channels
  
  Channel positions           : Front: L C R, Side: L R, LFE
  
  Sampling rate               : 48.0 KHz
  
  Compression mode            : Lossy
  
  Stream size                 : 517 KiB (35%)

  The Master M3U8 :

  #EXTM3U
  
  #EXT-X-VERSION:7
  
  #EXT-X-INDEPENDENT-SEGMENTS
  
  
  
  #EXT-X-STREAM-INF:RESOLUTION=426x240,BANDWIDTH=370000,CODECS="avc1.640015,mp4a.40.2"
  
  240p.m3u8
  
  
  
  #EXT-X-STREAM-INF:RESOLUTION=640x360,BANDWIDTH=580000,CODECS="avc1.640015,mp4a.40.2"
  
  360p.m3u8
  
  
  
  #EXT-X-STREAM-INF:RESOLUTION=896x504,BANDWIDTH=900000,CODECS="avc1.640015,mp4a.40.2"
  
  480p.m3u8
  
  
  
  #EXT-X-STREAM-INF:RESOLUTION=1280x720,BANDWIDTH=1500000,CODECS="avc1.640015,mp4a.40.2"
  
  720p.m3u8

  240p.m3u8

  #EXTM3U
  
  #EXT-X-VERSION:7
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-PLAYLIST-TYPE:VOD
  
  #EXT-X-TARGETDURATION:34
  
  
  
  #EXTINF:33.033033,
  
  240p000.mp4
  
  #EXTINF:33.533534,
  
  240p001.mp4
  
  #EXTINF:24.941608,
  
  240p002.mp4
  
  #EXTINF:28.611945,
  
  240p003.mp4
  
  #EXT-X-ENDLIST

  When tested with HLS.js, gives this error :

  Parsing Error:no demux matching with content found,cannot recover,
  last media error recovery failed ...

  Bitmovin Player : loads all segments of all variants and never plays any of them. just stop.

  Tested on Chrome & Firefox On Windows, Safari on Mac, Android and iPad Browsers. Never works on any of them. Are we doing anything wrong ?!

• Is there a way to run a ffmpeg command based on the videos resolution ?

  15 avril 2022, par William Lee

  As an example, if a video has a maximum resolution of 480p, DO NOT convert it to 1080p, just convert it from 144p to 480p.

  


  Is there any way that this is possible ?