Recherche avancée

Sur d’autres sites (9782)

• ProcessBuilder is not called when trying to start a process

  15 juin 2022, par xnok

  I am trying to understand more about the ffmpeg usage in JavaCV for android studio and for said task I am trying to use ProcessBuilder. I tried writting a simple program to debug the pb.start(); Although, I am not getting a response. What I did was to start a default/empty activity and pasted the following program :

  


  package com.example.myapplication;

import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;

import org.bytedeco.javacpp.Loader;

import android.os.Build;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends AppCompatActivity {
    static final int cols = 192;
    static final int rows = 108;
    static final String ffmpeg = Loader.load(org.bytedeco.ffmpeg.ffmpeg.class);
    static final String rtmp_url = "test.flv";
    static final String[] command = {ffmpeg,
            "-y",
            "-f", "rawvideo",
            "-vcodec", "rawvideo",
            "-pix_fmt", "bgr24",
            "-s", (Integer.toString(cols) + "x" + Integer.toString(rows)),
            "-r", "10",
            "-i", "pipe:",
            "-c:v", "libx264",
            "-pix_fmt", "yuv420p",
            "-preset", "ultrafast",
            "-f", "flv",
            rtmp_url};
    @RequiresApi(api = Build.VERSION_CODES.O)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        new Thread(t1).start();

    }
    private static Runnable t1 = () -> {
        Log.e("TAG", "void OnCreate called successfully!");
        ProcessBuilder pb = new ProcessBuilder(command).redirectErrorStream(true);
        pb.redirectErrorStream(true);
        try {
            Process process = pb.start();
            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            OutputStream writer = process.getOutputStream();
            Log.e("TAG", "Something good happened here");
        } catch (IOException e) {
            e.printStackTrace();
            Log.e("TAG", "Nothing good happened here");
        }
    };


}


  


  My current problem is that I can't seem to start properly the processBuilder process via pb.start() ;

  


  I get the following logs from the logcat panel :

  


  2022-06-14 17:24:46.328 13371-13371/com.example.myapplication E/TAG: void OnCreate called successfully!
2022-06-14 17:24:46.333 13371-13371/com.example.myapplication E/TAG: Nothing good happened here


  


  I'd like to understand why is it skipping the try/catch block and not starting the process ?

  


  EDIT : I made some changes as per @g00se's suggestions and I got the following stack trace from the code above :

  


  2022-06-15 00:32:26.700 29787-29787/? E/USNET: USNET: appName: com.example.myapplication
2022-06-15 00:32:29.328 29787-29828/com.example.myapplication E/TAG: void OnCreate called successfully!
2022-06-15 00:32:29.330 29787-29828/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: Thread-4
    Process: com.example.myapplication, PID: 29787
    java.lang.NullPointerException
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:1012)
        at com.example.myapplication.MainActivity.lambda$static$0(MainActivity.java:48)
        at com.example.myapplication.MainActivity$$ExternalSyntheticLambda0.run(Unknown Source:0)
        at java.lang.Thread.run(Thread.java:920)


  


• How can I convert a mp4 file to webm using java only ?

  31 octobre 2023, par mir-shakir

  I am trying to convert a file from mp4 to webm. I am trying to use the JAVE wrapper of FFmpeg. I am getting the error.
Here is my code :

  


  private String ConvertVideo(URL url) {
    File target =null;
    MultimediaObject multimediaObject = new MultimediaObject(url);
    try {
        target = File.createTempFile("target", ".webm");

    } catch (IOException e1) {
        e1.printStackTrace();
    }
    AudioAttributes audio = new AudioAttributes();
    audio.setCodec(AudioAttributes.DIRECT_STREAM_COPY);
    audio.setBitRate(new Integer(128000));
    audio.setSamplingRate(new Integer(44100));
    audio.setChannels(new Integer(2));
    VideoAttributes video = new VideoAttributes();
    video.setBitRate(new Integer(160000));
    video.setFrameRate(new Integer(15));
    video.setCodec("libvpx-vp9");
    video.setCodec(VideoAttributes.DIRECT_STREAM_COPY);
    EncodingAttributes attrs = new EncodingAttributes();
    attrs.setFormat("webm");
    attrs.setAudioAttributes(audio);
    attrs.setVideoAttributes(video);
    
    try {
          Encoder encoder = new Encoder();  
          encoder.encode(multimediaObject, target, attrs);
        } catch (Exception e) {  
           e.printStackTrace();
        }
    
    return "success";
}


  


  I am getting the below error :

  


  2022-Jun-13 11:12:55 AM [qtp1914526580-175] ERROR ws.schild.jave.Encoder - Process exit code: 1  to target2636257785060285182.webm
ws.schild.jave.EncoderException: Exit code of ffmpeg encoding run is 1


  


  What am I doing wrong here. Is there any other way around it ? I want to do it only using java.

  


• ffmpeg Batch Replace MP4 Thumbnails

  1er juin 2022, par pglove

  Windows 10, 2022 build of ffmpeg

  


  I found this command to replace the thumbnails on mp4 files :

  


  ffmpeg -i video.mp4 -i image.png -map 1 -map 0 -c copy -disposition:0 attached_pic out.mp4


  


  here :
How do I add a custom thumbnail to a .mp4 file using ffmpeg ?

  


  I have modified it to use jpg instead of png, and have a folder full of videos and images.

  


  ffmpeg -i ###.mp4 -i ###.jpg -map 1 -map 0 -c copy -disposition:0 attached_pic ###-new.mp4


  


  Every mp4 has an alpha-numeric name with a corresponding jpg of the same name.

  


  I generated a list of commands I would need for each file, so I have 100 commands.

  


  If I copy and paste one line at a time it works, but when I copy and paste all 100 lines into the command line on windows it seems like one or two files process as expected, but the rest fail.

  


  I'm pretty sure I'm just missing a step, and any help would be much appreciated turning it into a batch process.

  


  Thanks

  


  *I just tried with 2 lines, the first processed, the second stopped.

  


  Some feedback would be nice if I've posed the question poorly, not provided enough information, or done something else wrong to deserve a downvote already. I don't use forums very often, I try to only ask when I'm stumped, so perhaps my etiquette is poor. I thought I followed correct procedure...