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• How to get a file converted by ffmpeg in Android : permission denied

  2 juin 2021, par Omid.N

  I am trying to use FFmpeg in my android app. So I want to test it if it works before moving on. I use an external library : github link
  
The code looks like this :

  


  package net.omidn.aslanmediaconverter;

import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import com.arthenica.ffmpegkit.ExecuteCallback;
import com.arthenica.ffmpegkit.FFmpegKit;
import com.arthenica.ffmpegkit.FFmpegSession;
import com.arthenica.ffmpegkit.Session;

import net.bramp.ffmpeg.job.FFmpegJob;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;


public class MainActivity extends AppCompatActivity {
    
    private static final String TAG = "MainActivity";
    FFmpegJob myjob;

    @Override
    protected void onCreate(Bundle savedInstanceState) {


        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        TextView textView = (TextView) findViewById(R.id.text_view);


        FFmpegJob job = null;

        File inFile = new File("/storage/emulated/0/video_2021-05-29_17-50-20.mp4");
        String inputName = Uri.fromFile(inFile).toString();
        Log.d(TAG, inputName);
        Log.d(TAG,"file exists : " + String.valueOf(inFile.exists()));
        Log.d(TAG,"file canRead : " + String.valueOf(inFile.canRead()));

        FFmpegSession fFmpegSession = FFmpegKit.executeAsync("-i file:///storage/emulated/0/video_2021-05-29_17-50-20.mp4 -c:v mpeg4 file:///storage/emulated/0/out.mp4",
                new ExecuteCallback() {
                    @Override
                    public void apply(Session session) {

                    }
                });
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        textView.setText("" + fFmpegSession.getState().name() + "    " + fFmpegSession.getOutput());
    }

}



  


  As you can see I give the files with file:/// protocol. If I don't use that the resault is the same. The three lines of Log.d(...) will print :

  


  2021-06-03 00:58:08.869 8376-8376/net.omidn.aslanmediaconverter D/MainActivity: file:///storage/emulated/0/video_2021-05-29_17-50-20.mp4
2021-06-03 00:58:08.869 8376-8376/net.omidn.aslanmediaconverter D/MainActivity: file exists : true
2021-06-03 00:58:08.869 8376-8376/net.omidn.aslanmediaconverter D/MainActivity: file canRead : false


  


  The video file has read access on the storage :


  


• Live555 Multicast RTSP Server - Display in FFMPEG

  31 mai 2021, par BanB

  I made a multicast RTSP server using the Live555 library.
  
It is displayed by VLC but not from VMS (NX Witness) or FFMPEG.
  
If I use the Unicast, I can display it, but I do not know how to change the file that is streaming in the Unicast.
  
Is there a way to change the streaming file in Unicast or make it viewable in FFMPEG with Multicast ?

  


  This is my code.

  


  


  Header

  


  


  #include <iostream>&#xA;#include <string>&#xA;#include <filesystem>&#xA;#include <fstream>&#xA;#include <ctime>&#xA;#include &#xA;#include &#xA;#include  &#xA;#include <opencv2></opencv2>videoio.hpp>&#xA;#include <opencv2></opencv2>imgcodecs.hpp>&#xA;&#xA;void Start(const char* streamPath, int port);&#xA;void AddDataL(BYTE* data, int length);&#xA;AddDataHW(BYTE* data, int height, int width);&#xA;&#xA;void Play();&#xA;void AfterPlaying(void*);&#xA;&#xA;void EncodeToH264(cv::Mat image);&#xA;long long GetTimeMs();&#xA;int GetFileCount();&#xA;const char* GetFirstFilePath();&#xA;&#xA;const int fourcc = cv::VideoWriter::fourcc(&#x27;x&#x27;, &#x27;2&#x27;, &#x27;6&#x27;, &#x27;4&#x27;);&#xA;&#xA;UsageEnvironment* env;&#xA;H264ServerMediaSubsession* h264;&#xA;H264VideoStreamFramer* videoSource;&#xA;RTPSink* videoSink;&#xA;&#xA;const char* dataPath = "data/";&#xA;const char* extension = ".h264";&#xA;</ctime></fstream></filesystem></string></iostream>

  


  


  CPP

  


  


  void Start()
{
    askScheduler *scheduler = BasicTaskScheduler::createNew();
    env = BasicUsageEnvironment::createNew(*scheduler);

    RTSPServer *rtspServer = RTSPServer::createNew(*env, 8554);

    if (rtspServer == NULL)
        throw;

    struct sockaddr_storage destinationAddress;
    destinationAddress.ss_family = AF_INET;
    ((struct sockaddr_in &)destinationAddress).sin_addr.s_addr = chooseRandomIPv4SSMAddress(*env);

    const unsigned short rtpPortNum = 18888;
    const unsigned short rtcpPortNum = rtpPortNum + 1;
    const unsigned char ttl = 255;

    const Port rtpPort(rtpPortNum);
    const Port rtcpPort(rtcpPortNum);

    Groupsock rtpGroupsock(*env, destinationAddress, rtpPort, ttl);
    rtpGroupsock.multicastSendOnly();
    Groupsock rtcpGroupsock(*env, destinationAddress, rtcpPort, ttl);
    rtcpGroupsock.multicastSendOnly();

    OutPacketBuffer::maxSize = 300000;
    videoSink = H264VideoRTPSink::createNew(*env, &rtpGroupsock, 96);

    const unsigned estimatedSessionBandwidth = 5000;
    const unsigned maxCNAMElen = 100;
    unsigned char CNAME[maxCNAMElen + 1];
    gethostname((char *)CNAME, maxCNAMElen);
    CNAME[maxCNAMElen] = '\0';

    RTCPInstance *rtcp = RTCPInstance::createNew(*env, &rtcpGroupsock, estimatedSessionBandwidth, CNAME, videoSink, NULL, True);

    ServerMediaSession *sms = ServerMediaSession::createNew(*env, "live", "live", "Session streamed by \"Test Server\"", True);
    sms->addSubsession(PassiveServerMediaSubsession::createNew(*videoSink, rtcp));
    rtspServer->addServerMediaSession(sms);

    *env << "Start > " << rtspServer->rtspURL(sms) << "\n";

    Play();

    env->taskScheduler().doEventLoop();
}

void AddData(BYTE* data, int length)
{
    EncodeToH264(cv::imdecode(cv::Mat(1, length, CV_8UC3, data), 1));
}

void EncodeToH264(cv::Mat image)
{
    std::string fileName = dataPath + std::to_string(GetTimeMs()) + extension;
    cv::VideoWriter writer(fileName.c_str(), fourcc, 1, image.size());
    writer.write(image);
    writer.write(image);
    writer.release();
}

void Play()
{
    while (GetFileCount() == 0);

    const char* fileName = GetFirstFilePath();

    ByteStreamFileSource* fileSource;
    while ((fileSource = ByteStreamFileSource::createNew(*env, fileName)) == NULL);

    FramedSource* videoES = fileSource;

    videoSource = H264VideoStreamFramer::createNew(*env, videoES);

    videoSink->startPlaying(*videoSource, AfterPlaying, videoSink);
}

void AfterPlaying(void*)
{
    videoSink->stopPlaying();
    Medium::close(videoSource);

    if (GetFileCount() > 1)
        std::filesystem::remove(GetFirstFilePath());

    Play();
}

long long GetTimeMs()
{
    return std::chrono::duration_cast(std::chrono::system_clock::now().time_since_epoch()).count();
}

int GetFileCount() 
{
    return std::distance(std::filesystem::directory_iterator(dataPath), std::filesystem::directory_iterator());
}

const char* GetFirstFilePath()
{
    for (const auto& entry : std::filesystem::directory_iterator(dataPath))
        return entry.path().string().c_str();
}


  


• How to use ffmpeg to record video from SDP ?

  17 août 2024, par Thomas Carlton

  I'm running Ubuntu 18.04 and I have the following SDP Offer from Kurento Media Server. The offer is saved to the file a.sdp :

  


      v=0
    o=- 3831476180 3831476180 IN IP4 172.31.46.122
    s=Kurento Media Server
    c=IN IP4 172.31.46.122
    t=0 0
    m=audio 28460 RTP/AVPF 96 0 97
    a=setup:actpass
    a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
    a=rtpmap:96 opus/48000/2
    a=rtpmap:97 AMR/8000
    a=rtcp:28461
    a=sendrecv
    a=mid:audio0
    a=ssrc:1797155263 cname:user1913428254@host-e7ab0454
    m=video 18122 RTP/AVPF 102 103
    a=setup:actpass
    a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
    a=rtpmap:102 VP8/90000
    a=rtpmap:103 H264/90000
    a=fmtp:103 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f
    a=rtcp:18123
    a=sendrecv
    a=mid:video0
    a=rtcp-fb:102 nack
    a=rtcp-fb:102 nack pli
    a=rtcp-fb:102 goog-remb
    a=rtcp-fb:102 ccm fir
    a=rtcp-fb:103 nack
    a=rtcp-fb:103 nack pli
    a=rtcp-fb:103 ccm fir
    a=ssrc:2822275190 cname:user1913428254@host-e7ab0454


  


  Then, I'm calling ffmpeg to record this flow to a file :

  


  ffmpeg -max_delay 5000 -reorder_queue_size 16384 -protocol_whitelist file,crypto,udp,rtp -re -i a.sdp -vcodec copy -acodec aac -y output.mp4


  


  172.31.46.122 is the local IP adress and I'm running ffmpeg from the same machine as SDP offer. So ffmpeg has access to this IP address.

  


  I'm getting the error :

  


  


  bind failed : Address already in use.

  


  a.sdp : Invalid data found when processing input

  


  


  How can I solve that ?