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• 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 ?

  


• What open source software would be best for reading in raw data from an SDR / USRP and decoding ATSC1.0 video and playing it ?

  18 août 2023, par railsnoob

  I've had luck with GNU Radio for ATSC1.0 decode from USRP data and sending the mpeg transport stream to VLC to be played but eventually I would like to have other DTV standards decoded.

  


  I started looking into packages with full DTV support and saw that VLC has TV tuner control/access, but if I have a USRP I'm not sure I could configure VLC to control that, or if I'd even want it to. But since it can go from tuner control to video playback there must be a command/configuration which just has it read from a raw data file that I captured from the USRP, right ?

  


  Does anyone know how to go from raw captured ATSC channel to MPEG transport stream on VLC, FFMPEG, or any other software packages ?

  


• How can I open a video encrypted with FFMPEG using openCV ?

  19 juillet 2023, par Richard S.J. Hwang

  I am developing a program that encrypts and saves video files and allows them to play only in programs that have key values. (by C#)

  


  I was looking for a way to encrypt a video file and found a way to encrypt it using FFMPEG's CENC.

  


  ffmpeg -i SampleVideo.mp4 -vcodec copy -acodec copy -encryption_scheme cenc-aes-ctr -encryption_key 76a6c65c5ea762046bd749a2e632ccbb -encryption_kid a7e61c373e219033c21091fa607bf3b8 SampleVideo_encrypted.mp4

  


  ffplay SampleVideo_encrypted.mp4 -decryption_key 76a6c65c5ea762046bd749a2e632ccbb

  


  ffmpeg -decryption_key 76a6c65c5ea762046bd749a2e632ccbb -i SampleVideo_encrypted.mp4 -vcodec copy -acodec copy SampleVideo_decrypted.mp4

  


  FFmpeg : how to produce MP4 CENC (Common Encryption) videos

  


  It is easy to encrypt and makes use of the header information of the video file.

  


  But I couldn't find a way to apply decryption at the same time as the Capture Video of OpenCV.
I thought I could use FFMPEG of OpenCV Backend and set the options, so I found a way to set the Windows environment variable, but it didn't work.(Only the gray screen is output.)
As a result of the search, only options related to H/W acceleration appear in OS environ.

  


  How to add ffmpeg options to VideoCapture
(Post written in python)

  


  import os
os.environ["OPENCV_FFMPEG_CAPTURE_OPTIONS"] = "video_codec;h264_cuvid"
cap = cv2.VideoCapture(url)


  


  Code I tested (not worked, c#)

  


  System.Environment.SetEnvironmentVariable("OPENCV_FFMPEG_CAPTURE_OPTIONS",
                                          "decryption_key;76a6c65c5ea762046bd749a2e632ccbb");
VideoCapture video = new VideoCapture(filename, VideoCaptureAPIs.FFMPEG);
...


  


  How can I open a video encrypted with FFMPEG using openCV ?

  


  Regards.