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• Playback FFmpeg stream through UDP

  11 juillet 2020, par Andrew Raleigh

  I'm using the following command to send ffmpeg data :

  


  ./ffmpeg -i "" -pix_fmt yuv420p -tune zerolatency -preset ultrafast -f mpegts udp://127.0.0.1:23000

  


  I then transmit and receive it to another computer through the srt protocol, and read it back on the end-point.

  


  I play back with .\ffplay.exe -i udp://127.0.0.1:23000 -loglevel 40 and don't see a video. I can see data coming in from WireShark though. This is the log output :

  


  ffplay version N-98438-gc6cdfdf9c3 Copyright (c) 2003-2020 the FFmpeg developers
  built with gcc 10.1.0 (Rev3, Built by MSYS2 project)
  configuration:  --cc='ccache gcc' --cxx='ccache g++' --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-schannel --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-gmp --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libaom --disable-debug --enable-libsrt --extra-libs=-liconv --enable-version3
  libavutil      56. 55.100 / 56. 55.100
  libavcodec     58. 94.100 / 58. 94.100
  libavformat    58. 48.100 / 58. 48.100
  libavdevice    58. 11.101 / 58. 11.101
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
Initialized direct3d renderer.
[mpegts @ 000002130b5eae00] Unable to seek back to the startf=0/0

....

[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20791500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20794500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20800500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.=0/0
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20805000).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20809500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20812500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 2 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20820000).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20824500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.=0/0
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20829000).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20838000).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20842500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20847000).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20853000).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20857500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.=0/0
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20862000).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20866500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20871000).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20875500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20880000).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] Packet corrupt (stream = 0, dts = 20884500).
[mpeg2video @ 000002130b612300] Invalid frame dimensions 0x0.
    Last message repeated 1 times
[mpegts @ 000002130b5eae00] changing packet size to 204  0B f=0/0
[mpegts @ 000002130b5eae00] changing packet size to 188
[mpegts @ 000002130b5eae00] changing packet size to 204  0B f=0/0
[mpegts @ 000002130b5eae00] changing packet size to 188  0B f=0/0
[mpegts @ 000002130b5eae00] changing packet size to 204  0B f=0/0
[mpegts @ 000002130b5eae00] changing packet size to 188  0B f=0/0


  


  FFPlay and FFProbe both output the above. Usually FFPlay would show the video playing back, but in this case I get nothing. Any thoughts as to why ?

  


• scaling and cutting a portion of video using ffmpeg

  19 août 2014, par Dnaso

  I am trying to upload a video that is 640 x 480. Using FFmpeg I am trying to resize to a square but I am having much difficulty.

  if i use s=320x320 in my command or scale 320x320

      ->setVideoScale(320, 320)

  the image is distored.

  If i change the aspect ratio 1:1 i get black bars.

  is there a way to actually just cut a RECT in the video. IE i want to be able to re save the video and it only capture

     x 0 to 320
  
     y 0 to 320  

  or whatever bounds I pick.

  Basically I do not want to re-size I just want to be able to re record a certain portion of the video. is this possible ?

• Player for Android SmartPhone and Android TV, live stream using m3u/m3u8 playlist with MPEG-2 TS channels

  30 mai 2016, par ot0

  I want to have a player (like IPTV) that can play the .m3u playlist channels.
  I have found ExoPlayer should support live-streaming. I want to be able to see the code because I want to add the player inside my own App and embed in my own GUI.

  I downloaded the open source github project of exoplayer github.com/google/ExoPlayer and appended the URL for our .m3u playlist (containing mpeg2-ts channels) in the demo but unfortunately it couldn’t play. Inside the Samples.java I added a Test channel :

  public static final Sample[] HLS = new Sample[] {
  
   new Sample("Apple AAC media playlist",
  
          "devimages.apple.com.edgekey.net/streaming/examples/bipbop_4x3/gear0/"
  
          + "prog_index.m3u8", Util.TYPE_HLS),
  
      new Sample("Apple ID3 metadata", "devimages.apple.com/samplecode/adDemo/ad.m3u8",
  
          Util.TYPE_HLS),
  
  
  
      ....
  
  
  
      new Sample("Test", "ipaddress.com/channels.m3u", Util.TYPE_OTHER)
  
    };

  I also tried to just paste the URL of one of the mpeg2-ts channels from the playlist but it didn’t work either

  The .m3u looks like :

  #EXTM3U
  
  #EXTINF:-1 group-title="Random" tvg-logo="xx.com/pic/channel1.jpg",Channel1
  
  ipaddress.com:7777/channel1
  
  ..
  
  #EXT-X-ENDLIST

  Does anyone have some recommendations ? It is not possible to play IPTV encapsulated in MPEG-2 TS using ExoPlayer ? If not, do we have alternatives ? I am mostly for an open source project where the player is already implemented so that I only need to add visual elements inside it. Otherwise API to other apps will also be useful