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• Allowing downloads of partial video files from Django

  18 janvier 2019, par DataVis

  I have a Django app that allows users to make/save ’clips’ of video files, that is keep timestamps of start and end times of video files to save in playlists. I would like users to be able to download clips (and playlists as well) they have saved.

  I have done quite a bit of research on the topic and have gotten ffmpeg working from my terminal to save partial clips (though I’ve struggled to figure out pathnames for using subprocess.call with ffmpeg), and I have also gotten moviepy working via the terminal to save partial clips.

  I’m struggling to figure out how to incorporate this into my Django app so that users can click a link and subsequently begin a download of a specific clip (or playlist). I believe I will want to use celery to avoid tying up the server but I’m not even to the point where I can offload a task as I can’t figure out how to :

  1. ’Clip’ the original, longer video file to make it shorter (do I need to make a local copy of a new file first ?).
  2. Send a response as a download to the user.

  Here is my models.py :

  class Match(models.Model):
  
      game_id = models.IntegerField(primary_key=True,
  
          validators=[MinValueValidator(1)],db_column="game_id")
  
      wide = models.FileField(upload_to='games/2018/',blank=True,null=True)
  
  
  
  class Playlist(models.Model):
  
          name = models.CharField(default='',null=True,blank=True,max_length=200)
  
          created_by = models.ForeignKey(User,related_name="playlists",on_delete=models.CASCADE)
  
          created =   models.DateTimeField(editable=False)
  
          modified =  models.DateTimeField()
  
  
  
  
  
          def save(self, *args, **kwargs):
  
              ''' On save, update timestamps '''
  
              if not self.id:
  
                  entries = Playlist.objects.order_by('-id')
  
                  try:
  
                      self.id = entries[0].id + 1
  
                  except IndexError:
  
                      # we don't have any PlaylistEntries yet, so we just start @ 0
  
                      self.id = 0
  
                  self.created = timezone.now()
  
              self.modified = timezone.now()
  
  
  
              return super(Playlist, self).save(*args, **kwargs)
  
  
  
  
  
      class Clip(models.Model):
  
          name =  models.CharField(default='',null=True,blank=True,max_length=200)
  
          game_id = models.ForeignKey(Match,related_name="clips",on_delete=models.CASCADE,
  
              db_column="game_id",null=True,blank=True)
  
          clipstart = models.IntegerField(null=True,blank=True)
  
          clipend = models.IntegerField(null=True,blank=True)
  
          playlist = models.ForeignKey(Playlist,related_name="clips",on_delete=models.CASCADE,
  
              db_column="playlist",null=True,blank=True)
  
          created_by = models.ForeignKey(User,related_name="clips",on_delete=models.CASCADE)
  
          created =   models.DateTimeField(editable=False)
  
          modified =  models.DateTimeField()
  
          duration = models.IntegerField(null=True,blank=True)
  
  
  
          def save(self, *args, **kwargs):
  
              ''' On save, update timestamps '''
  
              if not self.id:
  
                  entries = Clip.objects.order_by('-id')
  
                  try:
  
                      self.id = entries[0].id + 1
  
                  except IndexError:
  
                      # we don't have any PlaylistEntries yet, so we just start @ 0
  
                      self.id = 0
  
                  self.created = timezone.now()
  
              self.modified = timezone.now()
  
              self.duration = int(self.clipend) - int(self.clipstart)
  
              return super(Clip, self).save(*args, **kwargs)

  And views.py where I’m struggling (I’m not sure if I’m working with FileField properly etc) :

  from moviepy.editor import *
  
  def ClipDownload(request,pk,*args,**kwargs):
  
  
  
      this_clip = models.Clip.objects.filter(pk=pk)
  
      file_name = this_clip[0].game_id.wide
  
  
  
      p = VideoFileClip(file_name,audio=False).subclip(this_clip.clipstart,this_clip.clipend)
  
  
  
      response = HttpResponse(p, content_type='application/force-download')
  
      response['Content-Disposition'] = 'attachment; filename=%s' % this_clip.name
  
      response['Content-Length'] = os.path.getsize(file_name)
  
      return response

  The current code is not working, I’m getting the proper Clip but I’m not able to make a subclip of the FileField as I’m getting an attribute error :

  AttributeError: 'FieldFile' object has no attribute 'endswith'

  I would be very appreciative if someone can point me in the right direction to get the file downloading so I can move on to trying to incorporate it into celery ?

• FFmpeg record and stream

  16 janvier 2019, par Robert

  I’m getting the following error.

     E/FFmpeg: Exception while trying to run: 
  
     [/data/user/0/com.example.pathways.testipcam/files/ffmpeg, -y, -i, 
  
    rtsp://log:pass@IP:port/video.h264, -acodec, copy, -vcodec, copy, -t, 
  
  00:03:00, 
  
   content://com.example.android.fileprovider/external_files/Android/data/com.example.pathways.testipcam/files/Movies/IPcam_20190116_150628_6019720208966811003.m>kv]
  
  java.io.IOException: Cannot run program "/data/user/0/com.example.pathways.testipcam/files/ffmpeg": error=2, No such >file or directory

  OK I’m trying to learn how to record and stream my IP cam on android. I can stream the video in a surface view media player no problem so I then went to the record task. Now I’m a bit lost. I know this is possible as I have read people say they used this to do it.

  I started with implamenting

   implementation 'nl.bravobit:android-ffmpeg:1.1.5'

  But I can’t figure out what I am missing or doing wrong as there aren’t really any tutorials explaining this completely. So hopefully this can be the thread everyone else finds for a solution. I have listed my code below. Exactly what have I got wrong here. It runs and goes to onStart...then right on onFailure.
  DO I need to have 2 streams in order to view and watch ? or what the deal.
  I know FFmpeg can do that.
  "ffmpeg supports multiple outputs created out of the same input(s) in the same process. The usual way to accomplish this is :

  ffmpeg -i input1 -i input2 \
  -acodec … -vcodec … output1 \
  -acodec … -vcodec … output2 \"

  but I have no idea how to sue that.
  Anyway, I know I’m kind of close, at least I hope I need a little help on getting over the finish line on this. What have I done wrong, how does this work.

  Here is what I did, I streamed the video as the app does. no problem

      surfaceView = (SurfaceView) findViewById(R.id.videoView);
  
      _surfaceHolder = surfaceView.getHolder();
  
      _surfaceHolder.addCallback(this);
  
      _surfaceHolder.setFixedSize(320, 240);
  
  
  
   ....
  
  
  
   @Override
  
  public void surfaceCreated(SurfaceHolder holder) {
  
      mpPlayerRun();
  
  
  
  }
  
  
  
  public void mpPlayerRun(){
  
      _mediaPlayer = new MediaPlayer();
  
      _mediaPlayer.setDisplay(_surfaceHolder);
  
  
  
      try {
  
          // Specify the IP camera's URL and auth headers.
  
          _mediaPlayer.setDataSource(RTSP_URL);
  
  
  
          // Begin the process of setting up a video stream.
  
          _mediaPlayer.setOnPreparedListener(this);
  
          _mediaPlayer.prepareAsync();
  
      }
  
      catch (Exception e) {}
  
  }
  
  ...
  
   @Override
  
  public void onPrepared(MediaPlayer mp) {
  
      _mediaPlayer.start();
  
  }

  OK, so then I created a button to record.

  @Override
  
  public void onClick(View view) {
  
      switch (view.getId()) {
  
          case R.id.IPcamback:
  
              break;
  
  
  
          case R.id.IPcamrecord:
  
              if (ContextCompat.checkSelfPermission(this,
  
                      Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
  
                  takeIPvid();
  
              } else {
  
                  requestIPCamPermission();
  
              }

  .....

  requested permission then results.

      private void requestIPCamPermission() {
  
      if (ActivityCompat.shouldShowRequestPermissionRationale(this,
  
              Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
  
  
  
          new AlertDialog.Builder(this)
  
                  .setTitle("Permission needed")
  
                  .setMessage("This permission is needed do to android safety protocol")
  
                  .setPositiveButton("ok", new DialogInterface.OnClickListener() {
  
                      @Override
  
                      public void onClick(DialogInterface dialog, int which) {
  
                          ActivityCompat.requestPermissions(MainActivity.this,
  
                                  new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE}, 420);
  
                      }
  
                  })
  
                  .setNegativeButton("cancel", new DialogInterface.OnClickListener() {
  
                      @Override
  
                      public void onClick(DialogInterface dialog, int which) {
  
                          dialog.dismiss();
  
                      }
  
                  })
  
                  .create().show();
  
  
  
      } else {
  
          ActivityCompat.requestPermissions(this,
  
                  new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE}, 420);
  
      }
  
  }
  
  
  
  @Override
  
  public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
  
  
  
      if (requestCode == 420)  {
  
          if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
  
              takeIPvid();
  
          } else {
  
              Toast.makeText(this, "Permission DENIED", Toast.LENGTH_SHORT).show();
  
          }
  
   .....

  then I made the file provider and createVideoOutputFile() method and the takeIPvid method.

  private File createVideoOutputFile() throws IOException {
  
      String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
  
      String imageFileName = "IPcam_" + timeStamp + "_";
  
      IPstorageDir = getExternalFilesDir(Environment.DIRECTORY_MOVIES);
  
      IPvideo_file = File.createTempFile(
  
              imageFileName,  /* prefix */
  
              ".mp4",         /* suffix */
  
              IPstorageDir      /* directory */
  
      );
  
  
  
      // Save a file: path for use with ACTION_VIEW intents
  
      String IPmVideoFilename = IPvideo_file.getAbsolutePath();
  
      return IPvideo_file;
  
  }
  
  
  
     private void takeIPvid() {
  
  
  
          File ipfile = null;
  
          try {
  
              ipfile = createVideoOutputFile();
  
          } catch (IOException e) {
  
              e.printStackTrace();
  
          }
  
      IPvideo_uri = FileProvider.getUriForFile(this,
  
              "com.example.android.fileprovider",
  
              ipfile);
  
  
  
  
  
      String[] cmd = {"-y", "-i", "rtsp://Login:Passord@IP:port/video.h264", "-acodec", "copy", "-vcodec", "copy","-t","00:00:20", IPvideo_uri.toString() };
  
  
  
      FFmpeg.getInstance(this).execute(cmd,new ExecuteBinaryResponseHandler(){
  
  
  
          @Override
  
          public void onStart() {
  
              super.onStart();
  
  
  
  
  
          }
  
  
  
          @Override
  
          public void onFailure(String message) {
  
              super.onFailure(message);
  
  
  
  
  
  
  
          }
  
  
  
          @Override
  
          public void onSuccess(String message) {
  
              super.onSuccess(message);
  
  
  
  
  
          }
  
  
  
          @Override
  
          public void onProgress(String message) {
  
              super.onProgress(message);
  
  
  
          }
  
  
  
          @Override
  
          public void onFinish() {
  
              super.onFinish();
  
  
  
          }
  
      });
  
  
  
  }

• Python Youtube ffmpeg Session Has Been Invalidated

  14 août 2020, par Daniel

  I get the following error while I'm playing YouTube audio with my bot

  



  [tls @ 0000024ef8c4d480] Error in the pull function.
[matroska,webm @ 0000024ef8c4a400] Read error
[tls @ 0000024ef8c4d480] The specified session has been invalidated for some reason.
    Last message repeated 1 times


  



  It seems like YouTube links expire ? I don't really know but I need to fix this issue. This is my code :

  



      class YTDLSource(discord.PCMVolumeTransformer):

        def __init__(self, source, *, data, requester):
            super().__init__(source)
            self.requester = requester

            self.title = data['title']
            self.description = data['description']
            self.uploader = data['uploader']
            self.duration = data['duration']
            self.web_url = data['webpage_url']
            self.thumbnail = data['thumbnail']

        def __getitem__(self, item: str):
            return self.__getattribute__(item)

        @classmethod
        async def create_source(cls, ctx, player, search: str, *, loop, download=True):
            async with ctx.typing():
                loop = loop or asyncio.get_event_loop()
                to_run = partial(ytdl.extract_info, url=search, download=download)
                raw_data = await loop.run_in_executor(None, to_run)

                if 'entries' in raw_data:
                    # take first item from a playlist
                    if len(raw_data['entries']) == 1:
                        data = raw_data['entries'][0]
                    else:
                        data = raw_data['entries']
                        #loops entries to grab each video_url
                        total_duration = 0
                        try:
                            for i in data:
                                webpage = i['webpage_url']
                                title = i['title']
                                description = i['description']
                                uploader = i['uploader']
                                duration = i['duration']
                                thumbnail = i['thumbnail']
                                total_duration += duration

                                if download:
                                    source = ytdl.prepare_filename(i)
                                    source = cls(discord.FFmpegPCMAudio(source), data=i, requester=ctx.author)
                                else:
                                    source = {'webpage_url': webpage, 'requester': ctx.author, 'title': title, 'uploader': uploader, 'description': description, 'duration': duration, 'thumbnail': thumbnail}

                                player.queue.append(source)

                        except Exception as e:
                            print(e)
                            return

                        embed=discord.Embed(title="Playlist", description="Queued", color=0x30a4fb, timestamp=datetime.now(timezone.utc))
                        embed.set_author(name=ctx.author.display_name, icon_url=ctx.author.avatar_url)
                        embed.set_thumbnail(url=data[0]['thumbnail'])
                        embed.add_field(name=raw_data['title'], value=f"{len(data)} videos queued.", inline=True)
                        embed.set_footer(text=raw_data["uploader"] + ' - ' + '{0[0]}m {0[1]}s'.format(divmod(total_duration, 60)))
                        await ctx.send(embed=embed)
                        return

                embed=discord.Embed(title="Playlist", description="Queued", color=0x30a4fb, timestamp=datetime.now(timezone.utc))
                embed.set_author(name=ctx.author.display_name, icon_url=ctx.author.avatar_url)
                embed.set_thumbnail(url=data['thumbnail'])
                embed.add_field(name=data['title'], value=(data["description"][:72] + (data["description"][72:] and '...')), inline=True)
                embed.set_footer(text=data["uploader"] + ' - ' + '{0[0]}m {0[1]}s'.format(divmod(data["duration"], 60)))
                await ctx.send(embed=embed)

                if download:
                    source = ytdl.prepare_filename(data)
                else:
                    source = {'webpage_url': data['webpage_url'], 'requester': ctx.author, 'title': data['title'], 'uploader': data['uploader'], 'description': data['description'], 'duration': data['duration'], 'thumbnail': data['thumbnail']}
                    player.queue.append(source)
                    return

                source = cls(discord.FFmpegPCMAudio(source), data=data, requester=ctx.author)
                player.queue.append(source)


        @classmethod
        async def regather_stream(cls, data, *, loop):
            loop = loop or asyncio.get_event_loop()
            requester = data['requester']

            to_run = partial(ytdl.extract_info, url=data['webpage_url'], download=True)
            data = await loop.run_in_executor(None, to_run)

            return(cls(discord.FFmpegPCMAudio(data['url']), data=data, requester=requester))


  



  I'm using the rewrite branch of discord.py for the bot.
I'm not sure if I need to provide more details ? Please let me know, I really need to get this fixed...