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• Execute mp4box cmd via java got error

  6 novembre 2015, par Ducthien

  sorry when I tag ffmpeg because I couldn’t tag MP4Box.But I have proplem with excuted with ffmpeg via javacode too.
  I read at How to execute cmd commands via Java but i can’t find my proplem.

  I’m tested commands in cmd, it was ok :

  MP4Box -dash 10000 -dash-profile live -segment-name output- seg -rap
  -bs-switching no input.mp4

  but when i executed cmd via java code , i get error :

  Error - only one input file found as argument, please check usage

  Below is my code, has something wrong ?

  package com.uit.reformatvideo;
  
  
  
  import java.io.BufferedReader;
  
  import java.io.IOException;
  
  import java.io.InputStreamReader;
  
  import java.util.logging.Logger;
  
  
  
  public class ExecuteComandToFormatVideo {
  
  
  
      public final static String LINK_MP4BOX = "C:/MP4Box/Tools/MP4Box.exe";
  
      public final static String CREATE_MPD_ECLIPSE = "mp4box -dash 10000 -frag 1000 -rap -bs-switching no";
  
      public final static String CREATE_MPD_IE = "MP4Box -dash 10000 -dash-profile live -segment-name output-seg -rap -bs-switching no";
  
      private static final Logger log = Logger.getLogger(ExecuteComandToFormatVideo.class.getName());
  
  
  
  
  
      public static void main(String[] args) throws IOException, InterruptedException {
  
            String s = null;
  
  
  
              try {
  
  
  
              // run the Unix "ps -ef" command
  
                  // using the Runtime exec method:
  
                  String lsCmd[] = new String [2];
  
                  lsCmd[0] = LINK_MP4BOX;
  
                  lsCmd[1] = "MP4Box -dash 10000 -dash-profile live -segment-name output-seg -rap -bs-switching no input.mp4";
  
                  Process p = Runtime.getRuntime().exec(lsCmd);
  
                  p.waitFor();
  
                  BufferedReader stdInput = new BufferedReader(new
  
                       InputStreamReader(p.getInputStream()));
  
  
  
                  BufferedReader stdError = new BufferedReader(new
  
                       InputStreamReader(p.getErrorStream()));
  
  
  
                  // read the output from the command
  
                  System.out.println("Here is the standard output of the command:\n");
  
                  while ((s = stdInput.readLine()) != null) {
  
                      System.out.println(s);
  
                  }
  
  
  
                  // read any errors from the attempted command
  
                  System.out.println("Here is the standard error of the command (if any):\n");
  
                  while ((s = stdError.readLine()) != null) {
  
                      System.out.println(s);
  
                  }
  
  
  
                  System.exit(0);
  
              }
  
              catch (IOException e) {
  
                  System.out.println("exception happened - here's what I know: ");
  
                  e.printStackTrace();
  
                  System.exit(-1);
  
              }
  
      }
  
  
  
  }

  Here was out put :

  Here is the standard output of the command :

  Here is the standarderror of the command (if any) : Error - only one
  input file found as argument, please check usage

• drawtext with ffmpeg python

  22 mai 2024, par Wolf Wolf

  I am trying to add a text to a video using ffmpeg and python.
I tried to do this in the following ways, but it didn't work.

  


  first

  


  (
         ffmpeg
         .input(in_video)
         .filter('drawtext',
                 fontsize=30,
                 fontfile=r"D:\projects\python\editor_bot\downloads\Candara.ttf",
                 text='test test test.',
                 x='if (eq(mod(t\\, 15)\\, 0)\\, rand(0\\, (w-text_w))\\, x)',
                 y='if (eq(mod(t\\, 10)\\, 0)\\, rand(0\\, (h-text_h))\\, y)')
         .output(f'output-final.mp4')
         .run()
 )


  


  second

  


  fil = fr"drawtext=text='test test test':fontsize=30:fontfile=':\projects\python\editor_bot\downloads\Candara.ttf':x='if (eq(mod(t\, 15)\, 0)\, rand(0\, (w-text_w))\, x)':y='if (eq(mod(t\, 10)\, 0)\, rand(0\, (h-text_h))\, y)'"
    (
        ffmpeg
        .input(in_video)
        .output(f'output-final.mkv', filter_complex=fil)
        .run()
    )


  


  But by running this command

  


  ffmpeg -i v1.mp4 -filter:v drawtext="fontsize=30:fontfile=candara.ttf:text='testtest test.':x=if(eq(mod(t\,15)\,0)\,rand(0\,(w-text_w))\,x):y=if(eq(mod(t\,10)\,0)\,rand(0\,(h-text_h))\,y)" -c:a copy -c:v libx264 -preset slow -crf 18 V13.mkv


  


  In the terminal, what I want is done exactly

  


  thanks

  


• Unable to pass parameters in seconds to FFMpeg afade audio filter

  9 septembre 2020, par Anton Serov

  I'm trying to use afade FFmpeg filter and it does not work as expected. I'm not able to pass its start and duration parameters in seconds.
With this string :

  



  afilter=afade=t=out:st=1:d=0:curve=par


  



  my afade filter starts fading from the very first frame. So I don't have any audio neither on the first nor on any other frames.
But if I set a magic number of 208 as the fade-out start time :

  



  afilter=afade=t=out:st=208:d=0:curve=par


  



  it starts working after 1 second (RMS turns into infinity on fade) :

  



  ...
Frame=0.501 Samples=23543 RMS=-35.186275
Frame=0.535 Samples=25014 RMS=-37.393734
Frame=0.568 Samples=26486 RMS=-40.655666
Frame=0.602 Samples=27957 RMS=-38.321899
Frame=0.635 Samples=29429 RMS=-41.370567
Frame=0.669 Samples=30900 RMS=-39.316444
Frame=0.702 Samples=32372 RMS=-27.994545
Frame=0.735 Samples=33843 RMS=-23.577181
Frame=0.769 Samples=35315 RMS=-22.933538
Frame=0.802 Samples=36786 RMS=-25.900106
Frame=0.836 Samples=38258 RMS=-26.836918
Frame=0.869 Samples=39729 RMS=-29.685308
Frame=0.902 Samples=41201 RMS=-32.493404
Frame=0.936 Samples=42672 RMS=-32.552109
Frame=0.969 Samples=44144 RMS=-42.384045
Frame=1.003 Samples=45615 RMS=-inf
Frame=1.036 Samples=47087 RMS=-inf
Frame=1.070 Samples=48558 RMS=-inf
Frame=1.103 Samples=50029 RMS=-inf
Frame=1.136 Samples=51501 RMS=-inf
Frame=1.170 Samples=52972 RMS=-inf
Frame=1.203 Samples=54444 RMS=-inf
Frame=1.237 Samples=55915 RMS=-inf
Frame=1.270 Samples=57387 RMS=-inf
Frame=1.304 Samples=58858 RMS=-inf
Frame=1.337 Samples=60330 RMS=-inf
Frame=1.370 Samples=61801 RMS=-inf
Frame=1.404 Samples=63273 RMS=-inf
Frame=1.437 Samples=64744 RMS=-inf
Frame=1.471 Samples=66216 RMS=-inf
Frame=1.504 Samples=67687 RMS=-inf


  



  Seems like I have to multiple my starting time in seconds by that strange coefficient of 208 (I found this value experimentally for 44100 Hz sample rate). The same thing is with duration parameter. To set a duration of N seconds I should pass N*208 as a parameter. For other sample rates this coefficient changes.

  



  So maybe there is something wrong with my filter graph initialization ?

  



  This is my code for filter graph initialization (almost copied it from some example) :

  



  int _InitFilterGraph(const char *_pszFilterDesc, AVFrame* _pFrame, AVRational* _pTimeBase)
{
    const AVFilter *pBufferSrc = avfilter_get_by_name( "abuffer" );
    const AVFilter *pBufferSink = avfilter_get_by_name( "abuffersink" );
    AVFilterInOut *pOutputs = avfilter_inout_alloc();
    AVFilterInOut *pInputs = avfilter_inout_alloc();

    AVSampleFormat out_sample_fmts[] = { (AVSampleFormat)_pFrame->format, (AVSampleFormat)-1 };
    int64_t out_channel_layouts[] = { (int64_t)_pFrame->channel_layout, -1 };
    int out_sample_rates[] = { _pFrame->sample_rate, -1 };

    m_pFilterGraph = avfilter_graph_alloc();

    // Buffer audio source: the decoded frames from the decoder will be inserted here.
    char args[512] = {};
    snprintf( args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%llx",
        _pTimeBase->num, _pTimeBase->den,
        _pFrame->sample_rate, av_get_sample_fmt_name( (AVSampleFormat)_pFrame->format ),
        _pFrame->channel_layout );

    int nRet = avfilter_graph_create_filter( &m_pBufferSrcCtx, pBufferSrc, "in",
        args, NULL, m_pFilterGraph );
    if( nRet < 0 ) goto final;

    // Buffer audio sink: to terminate the filter chain.
    AVABufferSinkParams *pBufferSinkParams = av_abuffersink_params_alloc();
    pBufferSinkParams->all_channel_counts = _pFrame->channels;

    nRet = avfilter_graph_create_filter( &m_pBufferSinkCtx, pBufferSink, "out",
        NULL, pBufferSinkParams, m_pFilterGraph );
    av_free( pBufferSinkParams );
    if( nRet < 0 ) goto final;

    nRet = av_opt_set_int_list( m_pBufferSinkCtx, "sample_fmts", out_sample_fmts, -1,
        AV_OPT_SEARCH_CHILDREN );
    if( nRet < 0 ) goto final;

    nRet = av_opt_set_int_list( m_pBufferSinkCtx, "channel_layouts", out_channel_layouts, -1,
        AV_OPT_SEARCH_CHILDREN );
    if( nRet < 0 ) goto final;

    nRet = av_opt_set_int_list( m_pBufferSinkCtx, "sample_rates", out_sample_rates, -1,
        AV_OPT_SEARCH_CHILDREN );
    if( nRet < 0 ) goto final;

    // Endpoints for the filter graph.
    pOutputs->name          = av_strdup( "in" );
    pOutputs->filter_ctx    = m_pBufferSrcCtx;
    pOutputs->pad_idx       = 0;
    pOutputs->next          = NULL;

    pInputs->name           = av_strdup( "out" );
    pInputs->filter_ctx     = m_pBufferSinkCtx;
    pInputs->pad_idx        = 0;
    pInputs->next           = NULL;

    nRet = avfilter_graph_parse_ptr( m_pFilterGraph, _pszFilterDesc, &pInputs, &pOutputs, NULL );
    if( nRet < 0 ) goto final;

    nRet = avfilter_graph_config( m_pFilterGraph, NULL );

final:
    avfilter_inout_free( &pInputs );
    avfilter_inout_free( &pOutputs );

    return nRet;
}