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• Where i made mistake - FFMPEG (LINUX) PROBLEM - basic

  22 mars 2019, par Fejor

  I just start learing ffmpeg, i have code (like bellow), but it’s doing nothing. Where i make mistake ? What wrong with that ?
  Sory for my language mistakes, i am not realy fluent in english

  fmpeg -i videoplayback.mp4 -filter_complex "[1:v]trim=start=0:end=1,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[intro1];
  
  [1:v]trim=start=1:end=123.39,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[main1];
  
  [1:v]trim=start=123.39:end=124.39,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[end1];
  
  [intro1]format=pix_fmts=yuva420p, fade=t=in:st=0:d=1:alpha=1[intro1];
  
  [end1]format=pix_fmts=yuva420p, fade=t=in:st=0:d=1:alpha=1[end1];
  
  [intro1][main1][end1][output];
  
  [a:1][audio]; -vcodec libx264 -map "[output]" -map"[audio]" "output.mp4"

• ffmpeg php video basic uses and types [theoritical]

  15 mai 2014, par HackerManiac

  Can anyone give a code on how do i covert a video using ffmpeg.

  As thought currently i have only uploading system.

  vu.php(only a part is shown)

  define('UPLOAD','../../videos/');
  
      $fileName = time().$file['name']; 
  
      $target = UPLOAD.$fileName;
  
  
  
    if(move_uploaded_file($file['tmp_name'],$target)){                
  
        exec("ffmpeg -i ".UPLOAD." ".UPLOAD.$filename.".flv"); 
  
    }

  This pice of code block just uploads the video on video folder but does not converts it to .flv.
  I am not sure how to use ffmpeg.

  My diretory looks like this

  www[localhost]->videos[videos folder]
  
  www[localhost]->pictures[pictures folder]
  
  www[localhost]->resources[folder]->php[folder]->vu.php

  I also want to return a .jpg image of any frame of video through json by converting via ffmpeg and uploading it to pictures folder.

  return json_encode(array("thumbnail"=>$image_src));

  UPDATE 1

  The above stuff was solved but now i have a question regarding video conversion.
  Suppose i have a file.avi and i want to convert it in 3 sizes of .flv format -> Low(320p) ,Medium (720p)and HD(1080p)

  what commands will i have to send to shell_exec(); and will that be fast enough ?
  CUrrently what i have is

  $vidSize = "640x480";
  
  $ffmpeg -i $videoFile -ar 22050 -ab 32 -f flv -s $vidSize $vidFile

  And i am not sure what -ar and -ab means and what value will be good for all those 3 sized videos ?

• Basic to use FFMPEG in Python (Django Rest Framework)

  31 juillet 2018, par Feed Git

  I’m writing a viewset in Django Rest Framework to convert images sequence into video by using FFMPEG but I don’t understand how I can do it. I tried but not success. Please help me with my code.

  My code :

  class VideoRenderSerializer(ModelSerializer):
  
      imageSequence = ListField(required=False, child=FileField(max_length=100000, allow_empty_file=False, use_url=False))
  
      class Meta:
  
          model = Video
  
          fields = [
  
              'imageSequence',
  
          ]
  
  
  
  class VideoRenderView(ModelViewSet):
  
      queryset = Video.objects.all()
  
      serializer_class = VideoRenderSerializer
  
  
  
      def render_video(self, request):
  
          imgSequences = request.FILES.getlist('imageSequence')
  
          render_from_img_sequences_cmd = 'ffmpeg -loop 1 -i image.png -vf format=yuv420p -t 30 C:\output.mp4'
  
          ffmpegresult = subprocess.call(render_from_img_sequences_cmd, shell=True, stdout=open(os.devnull, "w"), stderr=subprocess.STDOUT)
  
          return Response(ffmpegresult, status=200)

  Output is : 1 and I cant find where is output file !