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• Using FFMPEG to stream from one computer to another on the same network

  23 juin 2021, par Andy B

  My problem

  


  I have a device with cameras, and I can access the video from those cameras via RTP over RTSP.

  


  I have an Ethernet cord going from the device to my computer, and I can see/record the video from the device using FFMPEG or VLC. I just use rtsp://<ip of="of" device="device">/path/of/stuff.extension?camera=<number></number></ip> like the user's manual says.

  


  This works great, but ultimately, I want to stream this video to another computer on the same network. I have tried many different things, but nothing seems to work.

  


  Theoretically, this FFMPEG command should work, but I'm messing up somewhere and I don't know why or where.

  


  ffmpeg -rtsp_transport tcp -i rtsp://<ip of="of" device="device">/path/thing.extension?camera=1 \ &#xA;-f mpegts udp://<ip of="of" computer="computer" i="i" want="want" to="to" send="send" it="it">:<some port="port">&#xA;</some></ip></ip>

  


  In VLC on the other computer, I want to be able to just go into VLC and start a network stream that looks like udp://@<ip address="address">:<port></port></ip>

  


  What I thought would work, but doesn't

  


  If the camera device has IP A.A.A.A, and the computer getting and streaming the video is B.B.B.B, and the computer I want to watch the streamed video on is C.C.C.C then is the following correct ? Because it does not work for me...

  


  Computer A :

  


  ffmpeg -rtsp_transport tcp -i rtsp://A.A.A.A/path.ext?camera=1 -f mpegts udp://B.B.B.B:10001


  


  Computer B (in VLC) : udp://@B.B.B.B:10001

  


• FFmpeg Negative Duration [migrated]

  22 septembre 2014, par filby

  i have a large number of small videos (parts of a larger) of the form :

  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf55.43.100
  
  Duration: 00:00:05.53, start: -1.831497, bitrate: 3355 kb/s
  
  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 4760 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 157 kb/s (default)
  
  Metadata:
  
    handler_name    : SoundHandler

  I want to completely discard the negative start, the 1.83 seconds, and keep only the 3.67 seconds in the positive ’axis’.

  I cut the videos with the correct duration however i believe due to some sync i did in sound (in the original), resulted in me having a video of 5.53 second, of which 1.83 is audio only, and the last 3.67 seconds are the ones i want to keep (and the ones i did cut).

  In a video player i can watch the 3.67 seconds i want to however if i extract the audio i get +1.83 seconds of audio at start from the original video (from which i cut the parts) which i didnt intend to cut. What can i do ;

  P.S.
  Example of the command i used to cut the part :

  ffmpeg -ss 818 -i input -t 3.67 -codec:v libx264 -profile:v high -preset slow -b:v 5000k -maxrate 5000k -threads 0 -codec:a copy output

• Cannot open RTMP stream with FFMPEG Java Cannot assign requested address

  12 novembre 2023, par lastpeony4

  I am trying to open an RTMP stream with avformat_open_input and for some reason i keep getting Cannot assign requested address error.
  
My RTMP URL is correct because i can watch the stream using VLC Player and ffmpeg command line :
  
ffmpeg -i rtmp://1.1.1.1/app/teststream -vcodec copy -acodec copy output.mp4

  


  int timeout = 2500;
setConnectionTimeout(timeout);

AVDictionary optionsDictionary = new AVDictionary();

String timeoutStr = String.valueOf(this.timeoutMicroSeconds);
av_dict_set(optionsDictionary, "timeout", timeoutStr, 0);

int analyzeDurationUs = 1500 * 1000;
String analyzeDuration = String.valueOf(analyzeDurationUs);
av_dict_set(optionsDictionary, "analyzeduration", analyzeDuration, 0);

int ret;

if ((ret = avformat_open_input(inputFormatContext, streamUrl, null, optionsDictionary)) < 0) {
  // ERROR Cannot assign requested address
}


  


  I am using org.bytedeco:ffmpeg:5.1.2-1.5.8 (ffmpeg-5.1.2-1.5.8.jar)

  


  Why i can't open it ?