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• Precompiled FFmpeg for android versus building FFmpeg using android NDK

  19 juin 2017, par App Developer

  I am building an android app which does some video processing.

  I am currently using precompiled FFmpeg from https://github.com/writingminds/ffmpeg-android. The other option is to download FFmpeg source code and compile it using Android NDK. The reason I am contemplating option 2 is to enhance performance. My questions are

  1. Is there a difference between the two options mentioned above ?

  2. If yes, what would be the difference. Would it be enhanced performance (or) the result would simply be the same (or) are there some other benefits or drawbacks ?

  3. When they state precompiled FFmpeg, does it mean it was compiled using Android NDK for a specific architecture ?

  Please let me know.

  Thank you in advance !!!

• Gstreamer convert and display video v4l2 - tee problems in rust

  27 mars 2023, par d3im

  I have USB grabber v4l2 source and I want to tee stream to autovideosink and x264enc to file (now as fake black hole)

  


  When I disable one or another branch it works but together Pipeline goes :

  


  Pipeline state changed from Null to Ready
Pipeline state changed from Ready to Paused


  


  and stays there never switches to Playing

  


  gst-launch-1.0 with similar functionality works well.

  


      gst::Element::link_many(&[&pw_video, &v_caps, &vid_queuey, &vid_tee]).unwrap();
    gst::Element::link_many(&[&vid_queue1, &autovideoconvert, &vid_queuex, &autovideosink]).unwrap();
    gst::Element::link_many(&[&vid_queue2, &autovideoconvert_x264, &vid_queue3, &x264, &vid_queue4, &fake]).unwrap();

    let tee_display_pad = vid_tee.request_pad_simple("src_10").unwrap();
    let vid_queue1_pad = vid_queue1.static_pad("sink").unwrap();

    tee_display_pad.link(&vid_queue1_pad).unwrap();

    let tee_convert_pad = vid_tee.request_pad_simple("src_20").unwrap();
    let vid_queue2_pad = vid_queue2.static_pad("sink").unwrap();

    tee_convert_pad.link(&vid_queue2_pad).unwrap();


  


  How can I use tee in rust properly to have playable pipeline with two branches ?

  


  Update : I read some posts about increasing queue size, so I tried for this and then all queues :

  


      let vid_queue1 = gst::ElementFactory::make("queue")
        .name("queue1")
        .property("max-size-buffers", 5000 as u32)
        .property("max-size-bytes", 1048576000 as u32)
        .property("max-size-time", 60000000000 as u64)
        .build()
        .expect("queue1");


  


  but it didn't help so I tried set zero latency :

  


      let x264 = gst::ElementFactory::make("x264enc")
        .name("x264")
        .property_from_str("speed-preset", "ultrafast")
        .property_from_str("pass", "qual")
        .property_from_str("tune", "zerolatency")
        .property("quantizer", 0 as u32)
        .property("threads", 8 as u32)
        .build()
        .expect("!x264");


  


  and it works now. But comparable gst-launch-1.0 settings didn't had such option - only queues sizes increased.

  


  Is there any other option than setting zerolatency ?

  


• How to fix here "EPIPE" in Node js Socket.io

  23 avril, par Mehdi008

  Receiving this error :

  


  Error: write EPIPE
        at afterWriteDispatched (node:internal/stream_base_commons:161:15)
        at writeGeneric (node:internal/stream_base_commons:152:3)
        at Socket._writeGeneric (node:net:958:11)
        at Socket._write (node:net:970:8)
        at doWrite (node:internal/streams/writable:598:12)
        at clearBuffer (node:internal/streams/writable:783:7)
        at onwrite (node:internal/streams/writable:653:7)
        at WriteWrap.onWriteComplete [as oncomplete] (node:internal/stream_base_commons:107:10)
    Emitted 'error' event on Socket instance at:
        at emitErrorNT (node:internal/streams/destroy:169:8)
        at emitErrorCloseNT (node:internal/streams/destroy:128:3)
        at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
      errno: -4047,
      code: 'EPIPE',
      syscall: 'write'
    }


  


  // for this code: const { spawn } = require("child_process");

module.exports = (socket, pool) => {
    
    let stream_req_token = "";
    let rtmps_array = [];

    socket.on("stream_request_token",async(token)=>{

        const stream_reqs = await pool`SELECT * FROM stream_request WHERE token=${token}`;


        if(stream_reqs.length === 0){
            
            socket.emit("token_validation_response",false);
            return;
        }

        const stream_req = stream_reqs[0];

        if(!stream_req.is_valid){

            socket.emit("token_validation_response",false);
            return;
        }

        socket.emit("token_validation_response",true);

        stream_req_token = token;


    })

    socket.on("rtmps_array",async(array)=>{

        try{

            const rtmps = JSON.parse(array);

        const streams_requests = await pool`SELECT id FROM stream_request WHERE token=${stream_req_token}`;
        const stream_req_id = streams_requests[0].id;

        rtmps_array = rtmps;

        rtmps.map(async(rtmp)=>{

            await pool`INSERT INTO stream (platform,url,url_key,stream_request_id) 
            VALUES(${rtmp.platform},${rtmp.url},${rtmp.key},${stream_req_id})`;
        })

        socket.emit("rtmps_array_response",true);

        } catch(err){

            console.log(err);
            socket.emit("rtmps_array_response",false);

        }


    })

    //Start Streaming
    let ffmpegProcess = null;
    let isStreaming = false; // Flag to track streaming state

  socket.on("stream", (chunk) => {
    if (!ffmpegProcess) {
        console.log('Initializing FFmpeg process...');

        // Spawn FFmpeg process
        const resolution = "1280x720"; // Change to "1920x1080" for 1080p

        const ffmpegArgs = [
            "-i", "pipe:0", // Input from stdin
            "-c:v", "libx264", // Video codec
            "-preset", "veryfast", // Low latency encoding
            "-b:v", "4500k", // Target average bitrate (4.5 Mbps)
            "-minrate", "2500k", // Minimum bitrate
            "-maxrate", "6000k", // Maximum bitrate
            "-bufsize", "16000k", // Buffer size (twice the max bitrate)
            "-r", "30", // **FORCE 30 FPS**
            "-g", "60", // Keyframe interval (every 2 seconds)
            "-tune", "zerolatency", // Low latency tuning
            "-sc_threshold", "0", // Constant bitrate enforcement
            "-flags", "+global_header",
          
            // **Resolution Fix**
            "-s", resolution, // **Set resolution to 720p or 1080p**
            "-aspect", "16:9", // **Maintain aspect ratio**
            
            // **Frame Rate Fix**
            "-vsync", "cfr", // **Forces Constant Frame Rate (CFR)**
            "-fps_mode", "cfr", // **Prevents FFmpeg from auto-adjusting FPS**
            
            // Audio settings
            "-c:a", "aac",
            "-b:a", "128k", // Audio bitrate
            "-ar", "44100", // Audio sample rate
            "-ac", "2", // Stereo audio
          
            "-f", "flv" // Output format
          ];
      
          // Map the streams to multiple RTMP destinations
          rtmps_array.forEach((rtmp) => {
            ffmpegArgs.push("-map", "0:v:0", "-map", "0:a:0", "-f", "flv", `${rtmp.url}/${rtmp.key}`);
          });
      
          // Spawn FFmpeg process
          ffmpegProcess = spawn("ffmpeg", ffmpegArgs);

        ffmpegProcess.stderr.on('data', (data) => {
            console.log(`FFmpeg STDERR: ${data}`);
    });

        ffmpegProcess.on('close', (code) => {
            console.log(`FFmpeg process closed with code ${code}`);
            ffmpegProcess = null; // Reset process
            isStreaming = false; // Reset streaming state
        });

        ffmpegProcess.on('error', (err) => {
            console.error(`FFmpeg process error: ${err.message}`);
            ffmpegProcess = null; // Reset process
            isStreaming = false; // Reset streaming state
        });

        console.log('FFmpeg process started.');
        isStreaming = true; // Set streaming state to true
    }

    // Write chunk to FFmpeg process
    if (isStreaming && ffmpegProcess && ffmpegProcess.stdin && !ffmpegProcess.stdin.destroyed) {
        try {
            ffmpegProcess.stdin.write(chunk); // Write chunk to stdin
            console.log('Chunk written to FFmpeg.');
        } catch (err) {
            console.error('Error writing chunk to FFmpeg stdin:', err.message);
        }
    } else {
        console.error('FFmpeg process or stdin is not ready.');
    }
});

socket.on("stop-stream", async() => {
    console.log('Stream Stopped.');

    if(stream_req_token.length !== 0){

        await pool`UPDATE stream_request 
               SET is_valid=false
               WHERE token=${stream_req_token}`

        await pool`DELETE FROM current_streams WHERE id=${stream_req_token}`;       
    }

    if (ffmpegProcess) {
        isStreaming = false; // Set streaming state to false

        try {
            // Check if stdin is open before closing
            if (ffmpegProcess.stdin) {
                ffmpegProcess.stdin.end(); // End stdin safely
            }

            // Wait for FFmpeg to close before setting to null
            ffmpegProcess.on("close", () => {
                console.log("FFmpeg process closed.");
                ffmpegProcess = null;
            });

            // Kill FFmpeg process
            ffmpegProcess.kill("SIGTERM"); // Use SIGTERM for graceful exit

        } catch (err) {
            console.error("Error while stopping FFmpeg:", err.message);
        }
    } else {
        console.log("No active FFmpeg process.");
    }
});


socket.on('error', (err) => {
  console.error('Socket error:', err);
});

socket.on("disconnect", async() => {
    console.log('Client Disconnected.');

    if(stream_req_token.length !== 0){

        await pool`UPDATE stream_request 
               SET is_valid=false
               WHERE token=${stream_req_token}`;

        await pool`DELETE FROM current_streams WHERE id=${stream_req_token}`;       

    }
    
    if (ffmpegProcess) {
        isStreaming = false; // Set streaming state to false

        try {
            // Check if stdin is open before closing
            if (ffmpegProcess.stdin) {
                ffmpegProcess.stdin.end(); // End stdin safely
            }

            // Wait for FFmpeg to close before setting to null
            ffmpegProcess.on("close", () => {
                console.log("FFmpeg process closed.");
                ffmpegProcess = null;
            });

            // Kill FFmpeg process
            ffmpegProcess.kill("SIGTERM"); // Use SIGTERM for graceful exit


        } catch (err) {
            console.error("Error while stopping FFmpeg:", err.message);
        }
    } else {
        console.log("No active FFmpeg process.");
    }
});

};