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• My FFMPEG throws me unexpected errors while writing a Thumbnail to the songs

  4 mars 2019, par Harmonised7

  I am using Node to execute my ffmpeg. I use this wrapper :

  https://www.npmjs.com/package/ffmpeg

  Everything was fine when I was using smaller versions of the thumbnails provided by Youtube, but when I attempted the HD ones, it suddenly started giving me an error. I’ve tried -pix_fmt yuv422p and Many other pixel formats, but nothing helped. Though ONE out of 100+ songs did tag successfully.

  here is my code :

  downloadTags(tags.thumbnail, `./thumbnails/${tags.title}.jpg`).then(thumbnail =>
  
                      {
  
                          video.addCommand('-i', `"${thumbnail}"`);
  
                          video.addCommand('-map', '0');
  
                          video.addCommand('-map', '1');
  
                          video.addCommand('-c', 'copy');
  
                          video.addCommand('-c:v:1', 'png');
  
                          video.addCommand('-disposition:v:0', 'attached_pic');
  
                          if(tags.title)
  
                              video.addCommand('-metadata', `title="${tags.title}"`);
  
                          if(tags.artist)
  
                              video.addCommand('-metadata', `artist="${tags.artist}"`);
  
                          if(tags.id)
  
                              video.addCommand('-metadata', `comment="https://www.youtube.com/watch?v=${tags.id}"`);
  
                          video.addCommand('-pix_fmt', `yuv422p`);
  
  
  
  
  
                          var output = 'downloaded'
  
                          if (outFolder)
  
                          {
  
                              output = outFolder;
  
                              if(!fs.existsSync(output)) fs.mkdirSync(output);
  
                          }
  
  
  
                          video.save(`"./${output}/${tags.title}.${tags.format}"`, function (error, file) 
  
                          {
  
                              if (error)
  
                              {
  
                                  resolve(error);
  
                                  return
  
                              }
  
                              try
  
                              {
  
                                  fs.unlinkSync(song);
  
                              }
  
                              catch(err)
  
                              {
  
                                  console.log(err.code);
  
                              }
  
                              resolve();
  
  
  
                          });
  
                      });
  
  
  
                  }

  and here is my error :

  E

  RROR: Error: Command failed: ffmpeg -i "songs/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a" -y  -i "./thumbnails/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].jpg" -map 0 -map 1 -c copy -c:v:1 png -disposition:v:0 attached_pic -metadata title="&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep]" -metadata artist="AReallyLongAndAwesomeNameThatIsBetterThanYoursInEveryPossibleWay" -metadata comment="https://www.youtube.com/watch?v=HprdvIIpR-I" "./written/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a"
  
  ffmpeg version N-93214-g7e4d3dbe18 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8.2.1 (GCC) 20190212
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    libavutil      56. 26.100 / 56. 26.100
  
    libavcodec     58. 47.102 / 58. 47.102
  
    libavformat    58. 26.101 / 58. 26.101
  
    libavdevice    58.  6.101 / 58.  6.101
  
    libavfilter     7. 48.100 /  7. 48.100
  
    libswscale      5.  4.100 /  5.  4.100
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000002213366bb00] stream 0, timescale not set
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'songs/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a':
  
    Metadata:
  
      major_brand     : M4A
  
      minor_version   : 512
  
      compatible_brands: isomiso2
  
      title           : &I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep]
  
      artist          : Cider Party
  
      encoder         : Lavf58.18.104
  
      comment         : https://www.youtube.com/watch?v=HprdvIIpR-I
  
    Duration: 00:05:24.80, start: 0.000000, bitrate: 127 kb/s
  
      Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 120x90 [SAR 1:1 DAR 4:3], 90k tbr, 90k tbn, 90k tbc
  
  Input #1, image2, from './thumbnails/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 1575 kb/s
  
      Stream #1:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 480x360 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (mjpeg (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 00000221353d4fc0] deprecated pixel format used, make sure you did set range correctly
  
  [ipod @ 00000221336703c0] Could not find tag for codec png in stream #2, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Error initializing output stream 0:2 --
  
  Conversion failed!

  Keep in mind that All of my thumbnails retrieved are .jpg

  Any suggestions ? Getting really desperate at this point...

• Converting RGB to YUV, + ffmpeg

  10 juillet 2012, par TheSHEEEP

  I am trying the following to record a live video from my Flash/AIR application :

  1. I take a "screenshot" (BitmapData from stage) each frame.

  2. I convert each pixel to yuv format like this (V2) :

         var file :File = new File(_appUrl + "/creation/output.raw");
     
         var fs :FileStream = new FileStream();
     
         fs.open(file, FileMode.WRITE);
     
         var finalY :ByteArray = new ByteArray();
     
         var finalU :ByteArray = new ByteArray();
     
         var finalV :ByteArray = new ByteArray();
     
         var rect :Rectangle = new Rectangle(0, 0, 600, 700);
     
         var pixels :ByteArray;
     
         var pixel :uint;
     
         var r :uint;
     
         var g :uint;
     
         var b :uint;
     
         _screenBuffer = _screenBuffer.reverse();
     
         while (_screenBuffer.length > 0)
     
         {
     
             pixels = BitmapData(_screenBuffer.pop()).getPixels(rect);
     
             pixels.position = 0;
     
             // Convert and save each pixel
     
             for (var x:int = 0; x < 600; x++)
     
             {
     
                 for (var y:int = 0; y < 700; y++)
     
                 {
     
                     // Convert to yuv
     
                     pixel = pixels.readUnsignedInt();
     
                     r = pixel >> 16 & 0xff;
     
                     g = pixel >> 8 & 0xff;
     
                     b = pixel & 0xff;
     
                         // Y' is written for each pixel
     
                     finalY.writeByte(0.257 * r + 0.504 * g + 0.098 * b + 128);
     
                         // U and V are written once per 2x2 pixel block
     
                     if (x % 2 == 0 && y % 2 == 0)
     
                     {
     
                         finalU.writeByte(-0.148 * r - 0.291 * g + 0.439 * b + 128);
     
                         finalV.writeByte(0.439 * r - 0.368 * g - 0.071 * b + 128);
     
                     }
     
                 }
     
             }
     
         }
     
         // Write the converted bytes to the file
     
         finalY.position = 0;
     
         finalU.position = 0;
     
         finalV.position = 0;
     
         fs.writeBytes(finalY, 0, finalY.length);
     
         fs.writeBytes(finalU, 0, finalU.length);
     
         fs.writeBytes(finalV, 0, finalV.length);
     
         fs.close();

  3. I use the following line of ffmpeg to convert the raw file to a video :

     ffmpeg -r 30 -pix_fmt yuv420p -s 600x700 -vcodec rawvideo -f rawvideo -i output.raw -y test.mp4 

  A video is created, but it is simply a mess, barely resembling what was recorded. I know that the capturing process works, as I have tried the same BitmapData "screenshots" with the SimpleFlvWriter.

  So, either something is wrong with my conversion or with the ffmpeg line, but I have no idea.

  This is what ffmpeg outputs when creating the video, maybe it can help someone :

  libavutil      51. 39.100 / 51. 39.100
  
  libavcodec     54.  3.101 / 54.  3.101
  
  libavformat    54.  1.100 / 54.  1.100
  
  libavdevice    53.  4.100 / 53.  4.100
  
  libavfilter     2. 62.101 /  2. 62.101
  
  libswscale      2.  1.100 /  2.  1.100
  
  libswresample   0.  7.100 /  0.  7.100
  
  libpostproc    52.  0.100 / 52.  0.100
  
  [rawvideo @ 01D39FC0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, rawvideo, from 'output.raw':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 600x700, 30 tbr,
  
  30 tbn, 30 tbc
  
  [buffer @ 01D3FEC0] w:600 h:700 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
  
  [libx264 @ 0375DB80] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE 4.2 AVX
  
  [libx264 @ 0375DB80] profile High, level 3.1
  
  [libx264 @ 0375DB80] 264 - core 120 r2146 bcd41db - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'test.mp4':
  
    Metadata:
  
      encoder         : Lavf54.1.100
  
      Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 600x700, q=-1--1, 30 tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
  Press [q] to stop, [?] for help
  
  Truncating packet of size 630000 to 1
  
  frame=   48 fps=  0 q=-1.0 Lsize=     157kB time=00:00:01.53 bitrate= 837.3kbits/s
  
  video:156kB audio:0kB global headers:0kB muxing overhead 0.687626%
  
  [libx264 @ 0375DB80] frame I:3     Avg QP:23.15  size: 23480
  
  [libx264 @ 0375DB80] frame P:38    Avg QP:28.80  size:  2169
  
  [libx264 @ 0375DB80] frame B:7     Avg QP:29.61  size:   833
  
  [libx264 @ 0375DB80] consecutive B-frames: 79.2%  4.2%  0.0% 16.7%
  
  [libx264 @ 0375DB80] mb I  I16..4: 41.4%  6.2% 52.4%
  
  [libx264 @ 0375DB80] mb P  I16..4: 10.6%  3.3%  0.9%  P16..4: 68.4%  1.3%  1.2% 0.0%  0.0%    skip:14.2%
  
  [libx264 @ 0375DB80] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 13.3%  2.2%  0.7% direct: 1.9%  skip:81.9%  L0:51.6% L1:47.4% BI: 1.0%
  
  [libx264 @ 0375DB80] 8x8 transform intra:16.7% inter:31.2%
  
  [libx264 @ 0375DB80] coded y,uvDC,uvAC intra: 14.7% 25.5% 22.3% inter: 1.0% 4.1% 3.4%
  
  [libx264 @ 0375DB80] i16 v,h,dc,p: 87% 11%  2%  0%
  
  [libx264 @ 0375DB80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  3% 18% 75%  1%  0%  1%  1% 0%  0%
  
  [libx264 @ 0375DB80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  6% 74% 12%  1%  1%  1%  2% 1%  2%
  
  [libx264 @ 0375DB80] i8c dc,h,v,p: 51% 45%  4%  1%
  
  [libx264 @ 0375DB80] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0375DB80] ref P L0:  4.6%  0.4% 94.6%  0.3%
  
  [libx264 @ 0375DB80] ref B L0: 96.0%  4.0%
  
  [libx264 @ 0375DB80] ref B L1: 96.5%  3.5%
  
  [libx264 @ 0375DB80] kb/s:793.39

  I'm not really a codec expert (just starting ;)), so I don't know what to make of most of that.

  Here is a zip that contains one of the frames and the video output. What should be visible is a green smiling pear, without any artifacts. Remember the size is 600x700 and the format yuv420. Best to view such raw image files with irfanview, IMO. Don't mind the noise, its from pushing against my microphone ;)

• 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)