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• ffmpeg not converting mp3 to mp4 in flutter [duplicate]

  25 août 2020, par neena

  final String path = await _localPath ;
final Directory directory = await Directory('$path/CapturedImages').create(recursive : true) ;
print("The directory $directory is created") ;

  


    //print("Tempath::::::::::::::::: == $tempPath");
  String input = directory.path + '/' + "audio" + '.mp3';
  String output = directory.path   + "name" + ".mp4";
  final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();
  _flutterFFmpeg.execute("ffmpeg -i $input $output").then((rc) => print("FFmpeg process exited with rc $rc"));

 Input #0, mp3, from '/storage/emulated/0/Android/data/quadauq.ffmpeg_examplebyneena/files/CapturedImages/audio.mp3':
I/mobile-ffmpeg(10080):   Metadata:
I/mobile-ffmpeg(10080):     genre           : 
I/mobile-ffmpeg(10080): Cinematic
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):     album           : 
I/mobile-ffmpeg(10080): YouTube Audio Library
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):     title           : 
I/mobile-ffmpeg(10080): Impact Moderato
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):     artist          : 
I/mobile-ffmpeg(10080): Kevin MacLeod
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):   Duration: 
I/mobile-ffmpeg(10080): 00:00:27.25
I/mobile-ffmpeg(10080): , start: 
I/mobile-ffmpeg(10080): 0.034531
I/mobile-ffmpeg(10080): , bitrate: 
I/mobile-ffmpeg(10080): 224 kb/s
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):     Stream #0:0
I/mobile-ffmpeg(10080): : Audio: mp3, 32000 Hz, stereo, fltp, 224 kb/s
I/mobile-ffmpeg(10080): 
I/mobile-ffmpeg(10080):     Metadata:
I/mobile-ffmpeg(10080):       encoder         : 
I/mobile-ffmpeg(10080): LAME3.99r
I/mobile-ffmpeg(10080): 
E/mobile-ffmpeg(10080): [NULL @ 0xec3b0800] Unable to find a suitable output format for 'ffmpeg'
E/mobile-ffmpeg(10080): ffmpeg: Invalid argument
I/flutter (10080): FFmpeg process exited with rc 1


  


  This is the log. The mp3 is reading but not converting to mp4 can anyone please help ?

  


• How to join two video files using Python ?

  1er juillet 2013, par rash

  Here I tried to cut first and second 30sec long video file from "path/connect.webm" to the strings out and out1. It works. But what I need to do is to concatenate these two strings and write that to a file "path/final.webm". So that I get a 60sec long video file "final.webm" at the end. But now i get first 30sec long video only as the output. Please help me. Thanks a lot in advance.

  Code in python :

  import subprocess,os
  
  
  
  fname = "/home/xincoz/test/final.webm"
  
  
  
  fp = open(fname,'wb')
  
  
  
  ffmpeg_command = ["ffmpeg", "-i", "/home/xincoz/test/connect.webm", "-acodec", "copy",   "-ss", "00:00:00", "-t", "00:00:30","-f", "webm", "pipe:1"]
  
  
  
  p = subprocess.Popen(ffmpeg_command,stdout=subprocess.PIPE)
  
  
  
  out, err = p.communicate()
  
  
  
  ffmpeg_command1 = ["ffmpeg", "-i", "/home/xincoz/test/connect.webm", "-acodec", "copy",   "-ss", "00:00:31", "-t", "00:00:30","-f", "webm", "pipe:1"]
  
  
  
  p1 = subprocess.Popen(ffmpeg_command1,stdout=subprocess.PIPE)
  
  
  
  out1, err1 = p1.communicate()
  
  
  
  string = out + out1
  
  
  
  print len(out)
  
  
  
  print len(out1)
  
  
  
  print len(string)
  
  
  
  fp.write(string)
  
  
  
  fp.close()

  Please help me.

• Convert GIF to MP4 with ffmpeg with palette color

  28 mars 2019, par NAG

  Palettegen is ok :

  ffmpeg()
  
  .input('temp/' + input.hash)
  
  .outputOptions(["-vf fps=15,scale=320:-1:flags=lanczos,palettegen"])
  
  .output('temp/palette.png')

  the conversion using the palette return a error :

  Error : Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_paletteuse_0

  ffmpeg()
  
  .input('color=' + input.bg)
  
  .inputFormat('lavfi')
  
  .input('temp/' + input.hash)
  
  .inputFormat('gif')
  
  .input('temp/palette.png')
  
  .outputOptions('-lavfi paletteuse')
  
  .complexFilter(["[0][1]scale2ref[bg][gif]", "[bg]setsar=1[bg]", "[bg][gif]overlay=shortest=1[o]", "[o]scale=trunc(iw/2)*2:trunc(ih/2)*2"])
  
  .outputOptions(['-pix_fmt yuv420p', '-movflags frag_keyframe+empty_moov', '-movflags +faststart', '-crf 5'])
  
  .toFormat('mp4')
  
  .output('temp/final-' + input.hash)

  ffmpeg final command :

  ffmpeg -f lavfi -i color=ffffff -f gif -i temp/cf81f99083462f693406e8fd03ca7009 -i temp/palette.png -y -filter_complex [0][1]scale2ref[bg][gif];[bg]setsar=1[bg];[bg][gif]overlay=shortest=1[o];[o]scale=trunc(iw/2)*2:trunc(ih/2)*2 -lavfi paletteuse -pix_fmt yuv420p -movflags frag_keyframe+empty_moov -movflags +faststart -crf 5 -f mp4 temp/final-cf81f99083462f693406e8fd03ca7009