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• FFmpeg error parsing stats_file option when called from Python

  12 août 2022, par user3311005

  I can run this command on the CMD console :

  


  ffmpeg -i image_output\cbar_240_rec.bmp -i test_images\cbar_240.bmp -lavfi psnr=stats_file=cbar_240_rec_psnr.csv -f null -


  


  Running this command from Python is giving me an error.

  


    cmd = f'ffmpeg -i image_output\cbar_240_rec.bmp -i test_images\cbar_240.bmp -lavfi psnr=stats_file=test_images\cbar_240_rec.csv -f null -'
  retcode = subprocess.call( cmd, shell=True )


  


  Gives me an error parsing the stats_file. Here's the last part of the print output.

  


  [psnr @ 000001ca992e90c0] Unable to parse option value "extronbuildsburbank_pure3_adam_dev_4381simrivieraimage_outputcbar_240_rec.csv"
[psnr @ 000001ca992e90c0] [Eval @ 000000825e9febc0] Undefined constant or missing '(' in 'extronbuildsburbank_pure3_adam_dev_4381simrivieraimage_outputcbar_240_rec.csv'
[psnr @ 000001ca992e90c0] Unable to parse option value "extronbuildsburbank_pure3_adam_dev_4381simrivieraimage_outputcbar_240_rec.csv"
[psnr @ 000001ca992e90c0] Error setting option stats_version to value extronbuildsburbank_pure3_adam_dev_4381simrivieraimage_outputcbar_240_rec.csv.
[Parsed_psnr_0 @ 000001ca992e8fc0] Error applying options to the filter.
[AVFilterGraph @ 000001ca98dcde80] Error initializing filter 'psnr' with args 'stats_file=C:extronbuildsburbank_pure3_adam_dev_4381simrivieraimage_outputcbar_240_rec.csv'
Error initializing complex filters.
Invalid argument


  


• 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)


  


• avcodec/avcodec : Store whether AVCodec->close needs to be called

  18 avril 2021, par Andreas Rheinhardt

  avcodec/avcodec : Store whether AVCodec->close needs to be called
  Right now all AVCodecContexts except those using frame-threaded decoding
  
  call the codec's init function and expect its close function to be
  
  called. In order to make sure that the close function is not called for
  
  frame-threaded decoding ff_frame_thread_free() resets
  
  AVCodecContext.codec (and because of this it has to free the private
  
  AVOptions of the main AVCodecContext itself). This is not obvious and
  
  potentially fragile. Instead add a field to AVCodecInternal that
  
  indicates whether close should be called for this AVCodecContext.
  
  It is always zero when using frame-threaded decoding, so that resetting
  
  the codec is no longer necessary and has been removed.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/avcodec.c
  • [DH] libavcodec/internal.h
  • [DH] libavcodec/pthread_frame.c