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• Getting this error in ffmpeg pipeline : Non-monotonous DTS in output stream 0:0 ; previous : 4951970, current : 4951659 ; changing to 4951971

  6 décembre 2022, par RoshaanAli

  Error : Non-monotonous DTS in output stream 0:0 ; previous : 4951970, current : 4951659 ; changing to 4951971. This may result in incorrect timestamps in the output file.

  


  I am using AWS Chime streaming then passing there data stream to FFMPEG and then going live with that data stream using AWS IVS(Interactive video service).
I am using ffmpeg for changing aspects of video on live streaming and brightness and contrast.
But when we turn off camera and after some time reopen it we facing the above mention error.
I have read about concat but we don't have input file actually we are passing data stream is ffmpeg that's why its not working.

  


  Here is my ffmpeg command

  


  ffmpeg=ffmpeg.spawn('ffmpeg', [
            '-i', '-' ,
            // '-f', 'concat',
            // '-segment_time_metadata','1',
            // '-use_wallclock_as_timestamps', '1',
            '-c:v', 'libx264',
            '-b:v', '2567k',
            '-maxrate', '6000K',
            '-preset', 'ultrafast',
            '-profile:v', 'baseline',
            '-level', '3.0',
            // '-aspect', '9:16',
            '-force_key_frames', 'expr:gte(t,n_forced*2)',
            '-movflags', 'faststart',
            '-fflags', 'nobuffer',
            '-tune', 'zerolatency',
            '-acodec', 'aac',
            '-ab', '160k',
            '-ar', '44100',
            '-f', 'flv',
            'rtmps-url/secret-key-replaced'
        ])


  


  I have tried this command -use_wallclock_as_timestamps', '1' but it does nothing to error.

  


• Convert FFmpeg command to GStreamer pipeline parse image from rtsp stream

  24 septembre 2024, par azharmalik3

  I would like to convert the working FFmpeg command to a GStreamer pipeline to extract image from the RTSP stream.

  


  ffmpeg -hide_banner -v error -rtsp_transport tcp -stimeout 10000000 -i 'rtsp://{domain}/Streaming/tracks/101?starttime=20220831T103000Z&endtime=20220831T103010Z' -vframes 1 -y image.jpg


  


  Here is the GStreamer pipeline I tried to convert :

  


  gst-launch-1.0 rtspsrc location="rtsp://{domain}/Streaming/tracks/101?starttime=20220831T103000Z&endtime=20220831T103010Z" max-rtcp-rtp-time-diff=0 latency=0 is_live=true drop-on-latency=true ! decodebin3 ! videoconvert ! jpegenc snapshot=true ! filesink location="/mnt/c/images/frame3.jpg"


  


  I couldn't manage to get it working. It gives the wrong timestamp image and the Gstreamer pipeline never stopped after extracting the image just working like an infinite loop.

  


  But the FFmpeg command works perfect and extracts the correct image and quits from the command after successfully extracting the image.

  


• The fdsink element in GStreamer cannot be used to output the correct byte-stream to the pipeline

  21 avril 2022, par yuniversi

  Because I need to output the RTSP stream pulled from the GStreamer command line to my Python program, I use the fdsink element to output the byte-stream from the pipeline.
The video can be displayed correctly by using the xvimagesink element. The command line is as follows.

  


  gst-launch-1.0 rtspsrc location=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 ! queue2 ! rtph264depay ! capsfilter caps="video/x-h264, width=240, height=160" ! avdec_h264 ! videoconvert ! xvimagesink


  


  Correct video :


  


  Then I use fdsink instead of the xvimagesink element to output the byte stream from the pipeline and play it with ffplay. It can't display correct video. The command line is as follows.

  


  gst-launch-1.0 rtspsrc location=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 ! queue2 ! rtph264depay ! capsfilter caps="video/x-h264, width=240, height=160" ! avdec_h264 ! videoconvert ! fdsink | ffplay -f rawvideo -pixel_format rgb24 -video_size 240*160 -i -


  


  Wrong video :

  


  So is fdsink element wrong or other elements wrong ? Thank you for taking the time to help me solve the problem