Recherche avancée

Sur d’autres sites (4760)

• Write buffer to ffmpeg stdin and send websocket message after that

  6 septembre 2024, par alpecca

  I am working on a streaming application in which user can stream videos in real time to my server usig websocket and media recorder. I have written my backend code using fastapi python and I setup a websocket endpoint that would receive buffer data from the frontend every two second. But the problem I am facing is here :-

  


  process.stdin.write(data)
await websocket.send_json


  


  Here the code ffmpeg process write could take some time to take a buffer and write a mp4 for it, but the websocket send json won't wait for it and thus just send the message back to the client, which is causing videos being too short and currupted once the user stops the recording.

  


  Here is the full code

  


  @router.websocket("/stream")
async def websocket_endpoint(websocket: WebSocket, token: str = Query(...), videoId: str = Query(...), authorize: AuthJWT = Depends()):
    await manager.connect(websocket)
    dataNumber = 1

    recordingFile = os.path.join(temp_dir, f"recording_{videoId}.mp4")

    command = [
        'ffmpeg', 
        '-y',
        '-i', 
        '-', 
        '-codec:v', 
        'copy', 
        '-f', 'mp4',
        recordingFile,
        # "-"
        # f'output{queueNumber}.mp4',
    ]

    process = subprocess.Popen(command, stdin=subprocess.PIPE)

    try:
        while True:
            try:
                data = await websocket.receive_bytes()
                if not data:
                    break
                process.stdin.write(data)
                process.stdin.flush()
                await websocket.send_json({"chunkNumber": dataNumber, "status": 200})
                dataNumber = dataNumber + 1
            except RuntimeError:
                break      
    except WebSocketDisconnect:
        print(f"Client disconnected: {websocket.client.host}")
    finally:
        manager.disconnect(websocket)
        process.stdin.close()
        process.wait()
        process.terminate()


  


  What I want to do is on each buffer send from the client, I want to make sure that ffmpeg writes that to the filesystem compeletly and than only to send the websocket message back to the client. And also, as the request are coming from the client every 2 second no matter what, If the write is taking too long for the previous message, I want to make sure that that the ffmpeg first write that part to the file and send the message and than do the newer one

  


• How to Create video from selected images of a folder using FFMPEG ?

  20 février 2018, par Hadley V Sunny

  For the time being I am doing

  ProcessStartInfo ffmpeg = new ProcessStartInfo();
  
  ffmpeg.CreateNoWindow = false;
  
  ffmpeg.UseShellExecute = false;
  
  
  
  ffmpeg.FileName = "e:\ffmpeg\ffmpeg.exe";
  
  ffmpeg.Arguments = "for file in (D:\\Day\\*.jpg); do ffmpeg -i \"$file\" -vf fps=1/60 -q:v 3 \"D:\\images\\out.mp4\"; done;";
  
  ffmpeg.RedirectStandardOutput = true;
  
  Process x = Process.Start(ffmpeg);

  Here I’m getting exception saying system cannot find specified file.
  For time being I’m considering all the files in D :\Day*.jpg but actually I need to query individual files from a list.

  Where am I wrong in the above scenario ?

• Android with static ffmpeg build

  28 novembre 2013, par Sameer Z.

  I have checked your code on http://dl.dropboxusercontent.com/u/22605641/ffmpeg_android/main.html#tabs-2
  i have some query regarding configuration file.
  I need to modify that should include audio and video integration.
  My task is to create video(mp4) from static images with default audio(mp3).
  I am new on ffmpeg so did not know which lib and codec is need in configuration so can you please me ?