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• Unable to open FFmpegFrameRecorder stream on a UDP port on Windows

  4 juin 2022, par DeoBelbert

  I am trying to stream a webcam video with FFmpegFrameRecorder and play it with "ffplay" command, but the ffplay command fails with the following message 'udp ://127.0.0.1:25777 : Invalid data found when processing input/0'.

  


  The code I am using for streaming the video,

  


   public void startStreaming() throws Exception {
    OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);
    grabber.setVideoCodec(27);
    grabber.setImageMode(FrameGrabber.ImageMode.COLOR);
    grabber.setBitsPerPixel(10);
    grabber.setFormat("yuvj420p");
    grabber.start();
    FFmpegFrameRecorder  recorder = new FFmpegFrameRecorder("udp://127.0.0.1:25777", grabber.getImageWidth(), grabber.getImageHeight());
    recorder.setFrameRate(grabber.getFrameRate());
    recorder.setVideoBitrate(grabber.getVideoBitrate());
    recorder.setOption("listen", "1");
    recorder.setFormat("h264");
    recorder.setPixelFormat(AV_PIX_FMT_YUV420P);
    recorder.setVideoCodecName("h264_videotoolbox");
    recorder.setVideoCodec(27);
    recorder.setOption("keyint", "10");
    recorder.start();}


  


  And I am calling the recorder.record in a thread as follows,

  


  frame = grabber.grabFrame();                      
recorder.record(frame);


  


  After starting the stream, I opened the command line and tried to play the stream with the following command,

  


  ffplay udp://127.0.0.1:25777


  


  And it is failing with the following message,

  


  udp://127.0.0.1:25777: Invalid data found when processing input/0


  


  To get the stream information, I used the following command,

  


  ffmpeg -i udp://127.0.0.1:25777


  


  And it showed the following output,

  


  [h264 @ 0000014dd1424880] non-existing PPS 0 referenced
[h264 @ 0000014dd1424880] decode_slice_header error
[h264 @ 0000014dd1424880] non-existing PPS 0 referenced
[h264 @ 0000014dd1424880] decode_slice_header error
[h264 @ 0000014dd1424880] non-existing PPS 0 referenced
[h264 @ 0000014dd1424880] decode_slice_header error
[h264 @ 0000014dd1424880] non-existing PPS 0 referenced
[h264 @ 0000014dd1424880] decode_slice_header error
[h264 @ 0000014dd1424880] no frame!


  


  But when I tried with TCP protocol it is working fine and I am able to play the video.
How can I fix this issue ? this is the first time I am using the FFmpeg and JavaCV.

  


• How to make multi-stage Docker image but avoid shared libraries conflict ?

  26 mai 2022, par Politechniczny

  I need to make a Docker image that contains the following tools :

  


  

  • janus-pp-rec - video processor from Janus WebRTC

  


  • ffmpeg and ffprobe

  


  • Java 11 JDK

  


  


  So I tried to make multi-stage Docker image :

  


  FROM swmansion/janus-gateway:latest as janus
FROM jrottenberg/ffmpeg:latest as ffmpeg
FROM eclipse-temurin:11 as java

COPY --from=janus /usr /usr
COPY --from=ffmpeg /usr /usr


  


  but still some files were missing so I copied the whole containers :

  


  FROM swmansion/janus-gateway:latest as janus
FROM jrottenberg/ffmpeg:latest as ffmpeg
FROM eclipse-temurin:11 as java

COPY --from=janus / /
COPY --from=ffmpeg / /


  


  but still nor janus-pp-rec, neither ffmpeg is working because I get errors :

  


  $ docker container exec videoprocessing janus-pp-rec

janus-pp-rec: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found (required by /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0)
janus-pp-rec: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found (required by /usr/lib/x86_64-linux-gnu/libavutil.so.56)
janus-pp-rec: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by /usr/lib/x86_64-linux-gnu/libavutil.so.56)
...
janus-pp-rec: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.25' not found (required by /usr/lib/x86_64-linux-gnu/libopenmpt.so.0)
...

$ docker container exec videoprocessing ffmpeg

ffmpeg: error while loading shared libraries: libavdevice.so.58: cannot open shared object file: No such file or directory


  


  Any ideas how to make these tools work in one container ?

  


• Why RTP doesn't support multiple streams to one port but RTSP does ?

  30 avril 2022, par zenno2

  I use ffmpeg for streaming a video using RTP protocol.
Why I can't send multiple streams to one RTP port, but RTSP that uses RTP can ?
I started a RTSP server that listens 8554 TCP port and 8000/8001 RTP/RTCP. It easily can receive both video and audio streams to one port 8000, I've checked it with wireshark. But when I try to do the same with pure RTP using ffmpeg, it prints me an error

  


  Only one stream supported in the RTP muxer


  


  And if I want to stream a video with sound, I have to split them into two streams and send to different RTP ports. Or maybe I can somehow make it receive multiple streams to one port via RTP ?

  


  Could you explain me, why it happens ?