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• ffmpeg custom buffer sink filter

  25 novembre 2018, par NadavRub

  Environment

  • Ubuntu 18.04
  • C++
  • ffmpeg 3.4 (git master)
  • ffmpeg is used as a shared lib (InProc) via the C++ API

  Use-case

  • Per this link I am trying to use the ’avfilter_graph_*’ APIs to create ffmpeg graph
  • I would like the graph output to be sent out to my custom code ( part of the hosting application )

  Considered implementations

  • [A] Implement a custom sink filter ( part of libavfilter ) to implement my custom logic
  • [B] Implement a custom sink filter to grab the output samples and send them out to my application ( something similar to DShow SampleGrabber )

  Problem at hand

  With either of the above mentioned approaches the ffmpeg code has to be modified, and this impose an overhead in supporting future ffmpeg releases

  I wonder if there is any straight forward approach for an external ( hosting ) application to grab the graph output w/ minimal copying of the payload.

  Is there any way to use a custom AVIOContext to achieve that ? can I construct a graph connected to an output AVIOContext ? can I create a custom filter implemented in a module external to libavfilter and associate it w/ the graph using ’AVFilterContext’ ?

• SetInodeAttributes error when creating a file inside bucket

  19 août 2022, par Turgut

  I've made a C++ program that lives in gke and takes some videos as input using ffmpeg, then does something with that input using opengl,finally it encodes those edited videos as a single output. Normally the program works perfectly fine on my local machine, it encodes just as I want it to with no warnings whatsoever. But I want it to encode that video directly to the cloud using a gcsfuse bucket. I've succesfully mounted the bucket and it seems to create the file at the start of my programs run. But when the run is over it's suppose to finish the encoding and finilize the video file. However when it reaches the end it gives off this error on the terminal where I run the gcsfuse command :

  


  2022/08/19 21:38:15.477586 SetInodeAttributes: input/output error, SetMtime: UpdateObject: not retrying UpdateObject("c36c2633-d4ee-4d37-825f-88ae54b86100.mp4"): gcs.NotFoundError: googleapi: Error 404: No such object: development-videoo-storage1/c36c2633-d4ee-4d37-825f-88ae54b86100.mp4, notFound
fuse: 2022/08/19 21:38:15.477660 *fuseops.SetInodeAttributesOp error: input/output error
2022/08/19 21:38:15.637346 SetInodeAttributes: input/output error, SetMtime: UpdateObject: not retrying UpdateObject("c36c2633-d4ee-4d37-825f-88ae54b86100"): gcs.NotFoundError: googleapi: Error 404: No such object: development-videoo-storage1/c36c2633-d4ee-4d37-825f-88ae54b86100, notFound
fuse: 2022/08/19 21:38:15.637452 *fuseops.SetInodeAttributesOp error: input/output error
2022/08/19 21:38:15.769569 GetInodeAttributes: input/output error, clobbered: StatObject: not retrying StatObject("c36c2633-d4ee-4d37-825f-88ae54b86100.mp4"): gcs.NotFoundError: googleapi: Error 404: No such object: development-videoo-storage1/c36c2633-d4ee-4d37-825f-88ae54b86100.mp4, notFound
fuse: 2022/08/19 21:38:15.769659 *fuseops.GetInodeAttributesOp error: input/output error


  


  At the end I end up with a file with the same size as my desired output but with an invalid video with no frames in it.

  


  I'm using a service account to activate my bucket, I can read files just fine and my service account has every permission it needs, here is how I mount my bucket :

  


  GOOGLE_APPLICATION_CREDENTIALS=./service-account.json gcsfuse -o nonempty --foreground cloud-storage-name /media


  


  I'm using ubuntu 22.04

  


• Can't hear the audio rtp streaming

  18 juillet 2016, par starter

  i am trying to get the streaming audio from my computer’s mic to my tablet so i used the ffmpeg to create the stream :

  ffmpeg -f alsa -i hw:0  -acodec libmp3lame -f rtp rtp://224.1.2.4:7001/test.ffm

  The streaming is working perfectly between 2 computers in the same lanso i tried this code to get the audio streaming working on tablet but i hear nothing coming out from the tablet . note that 192.168.1.120 is my tablet’s ip .

   try {
  
                      audioGroup = new AudioGroup();
  
                      audioGroup.setMode(AudioGroup.MODE_NORMAL);
  
                      audioStream = new AudioStream(InetAddress.getByAddress(new byte[] {(byte)192, (byte)168, (byte)1, (byte)120 }));
  
                      audioStream.setCodec(AudioCodec.PCMU);
  
                      audioStream.setMode(RtpStream.MODE_NORMAL);
  
                      audioStream.associate(InetAddress.getByAddress(new byte[] {(byte)224, (byte)1, (byte)2, (byte)4 }), 7001);
  
                     audioStream.join(audioGroup);
  
                     AudioManager Audio =  (AudioManager) getSystemService(Context.AUDIO_SERVICE);
  
                      Audio.setMode(AudioManager.MODE_IN_COMMUNICATION);
  
                  }
  
                  catch (SocketException e) { e.printStackTrace();}
  
                  catch (UnknownHostException e) { e.printStackTrace();}
  
                  catch (Exception ex) { ex.printStackTrace();}}

  Please i need to know what’s the problem and how to fix it .