Recherche avancée

Sur d’autres sites (8513)

• Use ffmpeg to add text subtitles [closed]

  9 octobre 2024, par 0-alpha

  I am trying to add text subtitles to an .mp4 container using ffmpeg :

  



  ffmpeg -i input.mp4 -i input.srt -map 0.0 -map 0.1 -map 1.0 output.mp4


  



  When I am trying to run this line, it gives me an error :

  



  


  Nmber of stream maps must match number of output streams.

  


  



  If I try to change the mp4 to mkv (although mp4 supports text subtitles), like this :

  



  ffmpeg -i input.mp4 -i input.srt -map 0.0 -map 0.1 -map 1.0 output.mkv


  



  It correctly maps the streams, but gives an error :

  



  


  Encoder (codec id 94210) not found for output stream #0.2

  


  



  When I launch

  



  ffmpeg -codecs


  



  I can see that srt codec is supported as decoder and encoder, however I am not sure what is used for mp4 and mkv subs encoding, and whether I need to switch it on or compile separately.

  


• ffmpeg - error when overlay text animation and video

  14 novembre 2017, par Abc123

  I’m using this ffmpeg command to generate a video with fading text animation, this command is running fine with older version of ffmpeg - 2.8.11, but when I try to run the same command in another machine with ffmpeg version - 3.3.3, error occured :

  ffmpeg command :

  ffmpeg -i ./based_video/720/clip3.mp4 -filter_complex \
  
  "color=black:100x100[c]; \
  
  [c][0]scale2ref[ct][mv]; \
  
  [ct]setsar=1,split=3[t1][t2][t3]; \
  
  [t1]drawtext=fontfile=../../public/fonts/Roboto-Regular-webfont.ttf: \
  
  text='Test Text 1':fontsize=36:fontcolor=white,split[text1][alpha1]; \
  
  [text1][alpha1]alphamerge,fade=t=in:st=2:d=2:alpha=1,fade=t=out:st=7:d=2:alpha=1[txta1]; \
  
  [t2]drawtext=fontfile=../../public/fonts/Roboto-Regular-webfont.ttf: \
  
  text='Test Text 2':fontsize=36:fontcolor=white,split[text2][alpha2]; \
  
  [text2][alpha2]alphamerge,fade=t=in:st=2:d=2:alpha=1,fade=t=out:st=7:d=2:alpha=1[txta2]; \
  
  [t3]drawtext=fontfile=../../public/fonts/Roboto-Regular-webfont.ttf: \
  
  text='Test Text 3':fontsize=36:fontcolor=white,split[text3][alpha3]; \
  
  [text3][alpha3]alphamerge,fade=t=in:st=2:d=2:alpha=1,fade=t=out:st=7:d=2:alpha=1[txta3]; \
  
  [mv][txta1]overlay=x='300':y='300':shortest=1[mv1]; \
  
  [mv1][txta2]overlay=x='300':y='400':shortest=1[mv2]; \
  
  [mv2][txta3]overlay=x='300':y='500':shortest=1" \
  
  -c:v libx264 -c:a copy output.mp4

  Error : Error marking filter as finished, Conversion failed

• Watson NarrowBand Speech to Text not accepting ogg file

  19 janvier 2017, par Bob Dill

  NodeJS app using ffmpeg to create ogg files from mp3 & mp4. If the source file is broadband, Watson Speech to Text accepts the file with no issues. If the source file is narrow band, Watson Speech to Text fails to read the ogg file. I’ve tested the output from ffmpeg and the narrowband ogg file has the same audio content (e.g. I can listen to it and hear the same people) as the mp3 file. Yes, in advance, I am changing the call to Watson to correctly specify the model and content_type. Code follows :

  exports.createTranscript = function(req, res, next)
  
  { var _name = getNameBase(req.body.movie);
  
    var _type = getType(req.body.movie);
  
    var _voice = (_type == "mp4") ? "en-US_BroadbandModel" : "en-US_NarrowbandModel" ;
  
    var _contentType = (_type == "mp4") ? "audio/ogg" : "audio/basic" ;
  
    var _audio = process.cwd()+"/HTML/movies/"+_name+'ogg';
  
    var transcriptFile = process.cwd()+"/HTML/movies/"+_name+'json';
  
  
  
    speech_to_text.createSession({model: _voice}, function(error, session) {
  
      if (error) {console.log('error:', error);}
  
      else
  
        {
  
          var params = { content_type: _contentType, continuous: true,
  
           audio: fs.createReadStream(_audio),
  
            session_id: session.session_id
  
            };
  
            speech_to_text.recognize(params, function(error, transcript) {
  
              if (error) {console.log('error:', error);}
  
              else
  
                { fs.writeFile(transcriptFile, JSON.stringify(transcript), function(err) {if (err) {console.log(err);}});
  
                  res.send(transcript);
  
                }
  
            });
  
        }
  
    });
  
  }

  _type is either mp3 (narrowband from phone recording) or mp4 (broadband)
  model: _voice has been traced to ensure correct setting
  content_type: _contentType has been traced to ensure correct setting

  Any ogg file submitted to Speech to Text with narrowband settings fails with Error: No speech detected for 30s. Tested with both real narrowband files and asking Watson to read a broadband ogg file (created from mp4) as narrowband. Same error message. What am I missing ?