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• Using FFmpeg to receive H.264 video stream by SRTP in Windows [closed]

  29 août 2024, par Taylor Yi

  I am using LGPL version of FFmpeg on Windows. I've downloaded it from https://github.com/BtbN/FFmpeg-Builds.

  


  I have been trying to receive Secure RTP video stream using FFmpeg.
I want to receive the video as bgr24 rawvideo, and send it into output stream (using -).

  


  I have a script in GStreamer that works, so I want to convert it to FFmpeg.
Below are the GStreamer script. It plays the received video using autovideosink ;

  


  gst-launch-1.0 -v udpsrc port=4000 caps="application/x-srtp, ssrc=(uint)1356955624, mki=(buffer)01, srtp-key=(buffer)012345678901234567890123456789012345678901234567890123456789, srtp-cipher=(string)aes-128-icm, srtp-auth=(string)hmac-sha1-80, srtcp-cipher=(string)aes-128-icm, srtcp-auth=(string)hmac-sha1-80" ! srtpdec ! rtph264depay ! h264parse ! avdec_h264 ! autovideosink


  


  At first I wanted to see if the output is correct, so I set the output as a video file instead.
Here are the scripts I tried ;

  


  ffmpeg -protocol_whitelist file,udp,rtp -i settings.sdp -c:v copy out.mp4


  


  The 'settings.sdp' file is like this ;

  


  c=IN IP4 0.0.0.0
m=video 5000 RTP/SAVP 96
a=rtpmap:96 H264/90000
a=ssrc:1356955624 cname:stream
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:ASNFZ4kBI0VniQEjRWeJASNFZ4kBI0VniQEjRWeJ|2^20|1:1
a=rtcp-mux
a=rtcp-fb:96 nack
a=srtp-cipher:aes-128-icm
a=srtp-auth:hmac-sha1-80
a=srtcp-cipher:aes-128-icm
a=srtcp-auth:hmac-sha1-80


  


  but, when I try running this script, this error log is printed ;

  


  Incorrect amount of SRTP params
[sdp @ 000001e40785f340] RTP H.264 NAL unit type 27 is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[sdp @ 000001e40785f340] nal size exceeds length: 6664 608
[sdp @ 000001e40785f340] nal size exceeds length: 65101 502
[h264 @ 000001e4078661c0] non-existing PPS 0 referenced
[extract_extradata @ 000001e4078c4c80] Invalid NAL unit 0, skipping.
    Last message repeated 2 times
[h264 @ 000001e4078661c0] Invalid NAL unit 0, skipping.
    Last message repeated 2 times
[h264 @ 000001e4078661c0] non-existing PPS 0 referenced
[h264 @ 000001e4078661c0] decode_slice_header error
[h264 @ 000001e4078661c0] no frame!
[sdp @ 000001e40785f340] Undefined type (30)


  


  Is there an option I didn't add ? What can I do to fix this ?

  


• local.ERROR : ffmpeg failed to execute command

  20 août 2024, par AMNA IQBAL

  I am trying to draw points on a video.
  

  


  The Video is 12 seconds long and for one second there are 17 data points which needs to be plotted on the video of one frame (1 second).
  
It works for 6 seconds but not for 12 seconds.
  

  


  Why it's not working for longer videos ? Is there any limitations of commands in ffmpeg ?

  


  public function overlayCoordinates(Request $request)
{
Log::info('Received request to overlay coordinates on video.');

    set_time_limit(600); // 600 seconds = 10 minutes
    try {

        $request->validate([
            'video' => 'required|file|mimes:mp4,avi,mkv,webm|max:102400', // Video max size 100MB
            'coordinates' => 'required|file|mimes:txt|max:5120', // Coordinates text file max size 5MB
        ]);

        $videoFile = $request->file('video');
        $coordinatesFile = $request->file('coordinates');

        $videoFilePath = $videoFile->getRealPath();
        $videoFileName = $videoFile->getClientOriginalName();

        // Move the video file to the desired location if needed
        $storedVideoPath = $videoFile->storeAs('public/videos', $videoFileName);

        // Open the video file using Laravel FFmpeg
        $media = FFMpeg::fromDisk('public')->open('videos/' . $videoFileName);
        $duration = $media->getDurationInSeconds();

        Log::info('Duration: ' . $duration);

        $coordinatesJson = file_get_contents($coordinatesFile->getPathname());
        $coordinatesArray = json_decode($coordinatesJson, true);

        $frameRate = 30; // Assuming a frame rate of 30 fps
        $visibilityDuration = 0.5; // Set duration to 0.5 second

        for ($currentTime = 0; $currentTime < 7; $currentTime++) {
            $filterString = ""; // Reset filter string for each frame
            $frameIndex = intval($currentTime * $frameRate); // Convert current time to an index

            if (isset($coordinatesArray['graphics'][$frameIndex])) {
                // Loop through the first 5 keypoints (or fewer if not available)
                $keypoints = $coordinatesArray['graphics'][$frameIndex]['kpts'];
                for ($i = 0; $i < min(12, count($keypoints)); $i++) {
                    $keypoint = $keypoints[$i];

                    $x = $keypoint['p'][0] * 1920; // Scale x coordinate to video width
                    $y = $keypoint['p'][1] * 1080; // Scale y coordinate to video height

                    $startTime = $frameIndex / $frameRate; // Calculate start time
                    $endTime = $startTime + $visibilityDuration; // Set end time for 0.5 second duration

                    // Add drawbox filter for the current keypoint
                    $filterString .= "drawbox=x={$x}:y={$y}:w=10:h=10:color=red@0.5:t=fill:enable='between(t,{$startTime},{$endTime})',";
                }
                   Log::info("Processing frame index: {$frameIndex}, Drawing first 5 keypoints.");
        }

            $filterString = rtrim($filterString, ',');
            
            // Apply the filter for the current frame
            if (!empty($filterString)) {
                $media->addFilter(function ($filters) use ($filterString) {
                    $filters->custom($filterString);
                });
            }
        }

        $filename = uniqid() . '_overlayed.mp4';
        $destinationPath = 'videos/' . $filename;

        $format = new \FFMpeg\Format\Video\X264('aac');
        $format->setKiloBitrate(5000) // Increase bitrate for better quality
               ->setAdditionalParameters(['-profile:v', 'high', '-preset', 'veryslow', '-crf', '18']) // High profile, very slow preset, and CRF of 18 for better quality
               ->setAudioCodec('aac')
               ->setAudioKiloBitrate(192); // Higher audio bitrate
        

        // Export the video in one pass to a specific disk and directory
        $media->export()
              ->toDisk('public')
              ->inFormat($format)
              ->save($destinationPath);

        return response()->json([
            'message' => 'Video processed successfully with overlays.',
            'path' => Storage::url($destinationPath)
        ]);
    } catch (\Exception $e) {
        Log::error('Overlay process failed: ' . $e->getMessage());
        return response()->json(['error' => 'Overlay process failed. Please check logs for details.'], 500);
    }
}


  


• How to hold the mpegts stream for few seconds ?

  8 août 2024, par Aven

  How to hold the mpegts stream for 5 seconds without changing frams's PTS ?

  


  I tried the tsduck command as below :

  


  aven.cheng@tgcusers-MacBook-Pro ~ % tsp -I ip 235.35.3.5:3535 -P timeshift --time 5000 -O ip 235.35.3.5:3536

* Warning: timeshift: unknown initial bitrate, discarding packets until a valid bitrate can set the buffer size


  


  the stream of 235.35.3.5:3536 did come out 5 seconds later after i executed the above command..
But the frames' PTS of 235.35.3.5:3536 are not the same anymore. For exsample, the PTS of my target frame is 10935000 from 235.35.3.5:3535, but the PTS of my target frame has changed to 10830542 from 235.35.3.5:3536.

  


  Is that possible to hold the stream for few seconds and also keep the PTS unchanged ? I don't necessarily have to use tsduck ; I am open to using other tools.