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• FFMPEG : Error while opening encoder - when resizing

  10 août 2015, par pufAmuf

  I am trying to resize a video so that the height is 240px.

  Here is the code I used :

  ffmpeg -i input.mp4 -vf scale=-1:240 -acodec mp3 -vcodec libx264 output.mp4

  The error I received was this :

  Error while opening encoder for output stream #0:0 - maybe incorrect
  parameters such as bit_rate, rate, width or height

  Specifically, here is the complete response :

  > [libx264 @ 042e0200] width not divisible by 2 (427x240) Output #0,
  
  > mp4, to 'output_240p.mp4':   Metadata:
  
  >     major_brand     : isom
  
  >     minor_version   : 512
  
  >     compatible_brands: isomiso2avc1mp41
  
  >     encoder         : Lavf53.24.2
  
  >     Stream #0:0(und): Video: h264, none, q=2-31, 128 kb/s, SAR 1280:1281 DAR 0:0 , 25 fps (default)
  
  >     Metadata:
  
  >       creation_time   : 1970-01-01 00:00:00
  
  >       handler_name    : VideoHandler
  
  >       encoder         : Lavc56.57.100 libx264
  
  >     Stream #0:1(und): Audio: mp3, 0 channels, 128 kb/s (default)
  
  >     Metadata:
  
  >       creation_time   : 1970-01-01 00:00:00
  
  >       handler_name    : SoundHandler
  
  >       encoder         : Lavc56.57.100 libmp3lame Stream mapping:   Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))   Stream #0:1 ->
  
  > #0:1 (aac (native) -> mp3 (libmp3lame)) Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate,
  
  > rate, width or height

  If I use the below code, it works great, except then I can’t keep on using my aspect ratio :

  ffmpeg -i input.mp4 -s 320x240 -acodec mp3 -vcodec libx264 output.mp4

  Any idea what is going on here ? Thanks !

• How do I timestamp an excel document using Pandas ?

  16 juillet 2015, par Andy Do

  I have a script that uses FFMPEG and CMD to cut video files based off of an excel document row by row. I would like python to add a timestamp after it is done with a row. Can you guys please help ?

  import subprocess as sp, pandas as pd
  
  
  
  ffmpeg = 'C:/FFMPEG/bin/ffmpeg.exe' # on Windows
  
  datafile = r'C:\Users\A_Do\Dropbox\1. Projects\2. Python\TM Creator\tm_creator_test1.xlsx'
  
  
  
  xl = pd.ExcelFile(datafile,index = False)
  
  df = xl.parse('Sheet1')
  
  
  
  def create_tm():
  
      row_iterator = df.iterrows()
  
       # take first item from row_iterator
  
      for i, row in row_iterator:
  
          infile = row['filename']
  
          outputfile = row['outputfilename']
  
          timein = row['timein']
  
          duration = row['duration']
  
          decision = row['Create TM?']
  
          if decision == "Y":
  
              sp.call(ffmpeg + " -y -i " + infile + " -map 0:0 -map 0:1 -map 0:2 -acodec copy -ss " + str(timein) + " -codec copy -t " + str(duration) + " " + outputfile,shell=True) #this works
  
  
  
          elif decision != decision: #this gets rid of the NaN
  
              break
  
          else:
  
              print "You said you didn't want to make a TM for " + str(infile)
  
  
  
  create_tm()

  Thanks !

  My final code :

  import subprocess as sp, pandas as pd
  
  # (1) new import
  
  from openpyxl import load_workbook
  
  # (2) new import
  
  from datetime import datetime
  
  
  
  ffmpeg = 'D:/FFMPEG/bin/ffmpeg.exe' # on Windows
  
  datafile = r'D:\Dropbox\1. Projects\2. Python\TM Creator\tm_creator_test1.xlsx'
  
  
  
  # (3) open the file in openpyxl first:
  
  book = load_workbook(datafile)
  
  
  
  xl = pd.ExcelFile(datafile,index = False)
  
  df = xl.parse('Sheet1')
  
  
  
  def create_tm():
  
      row_iterator = df.iterrows()
  
       # take first item from row_iterator
  
      for i, row in row_iterator:
  
          infile = row['filename']
  
          outputfile = row['outputfilename']
  
          timein = row['timein']
  
          duration = row['duration']
  
          decision = row['Create TM?']
  
          if decision == "Y":
  
              sp.call(ffmpeg + " -y -i " + infile + " -map 0:0 -map 0:1 -acodec copy -ss " + str(timein) + " -codec copy -t " + str(duration) + " " + outputfile,shell=True) #this works
  
              # (4) Wherever in the code you want to put the timestamp:
  
              df.loc[i, 'Timestamp'] = str(datetime.now())
  
              # (5) This saves the sheet back into the original file, without removing
  
              # any of the old sheets.
  
              writer = pd.ExcelWriter(datafile)
  
              writer.book = book
  
              writer.sheets = dict((ws.title, ws) for ws in book.worksheets)
  
              df.to_excel(writer, index=False)
  
              writer.save()
  
          elif decision != decision: #this gets rid of the NaN
  
              break
  
          else:
  
              print "You said you didn't want to make a TM for " + str(infile)

• Join us for the Piwik Community Meetup 2015 !

  25 juin 2015, par Piwik Core Team — Community, Meta

  

  We’re excited to announce that our third Piwik Community Meetup will be held in Berlin on Tuesday, the 4th of August, 2015. Don’t miss this great opportunity to connect with other users and meet the core team behind Piwik. It’s free, so REGISTER TODAY ! And maybe you would like to share your Piwik use case ? We’re also waiting for your presentation ideas.

  We will cover some of the upcoming features, discuss the future of Piwik, share tricks and hacks to help you get the most out of your Piwik platform, and socialise. If you use Piwik to improve your websites and apps, or are just generally curious about digital analytics and marketing – this event is not to be missed. As our core team is scattered all over the world, this will be a rare opportunity for you to meet and talk to us all at once – especially for those of you interested in the platform, integrating your app with Piwik, and building plugins.

  After the official part, we would like to enjoy drinks with all the participants in the nearby bars. We hope you will be able to join us !

  All Piwik community members are warmly invited to take part in the meetup !

  Piwik Community Meetup 2015

  When ?

  Tuesday, the 4th of August, from 5-9pm

  Where ?

  Kulturbrauerei
  Schönhauser Allee
  Prenzlauer Berg area
  Berlin, Germany
  exact directions tbc.

  Languages :

  English and German

  Book tickets :

  BOOK YOUR FREE INVITATION HERE

  Open call for YOUR presentation ideas

  We would also like to hear how you use Piwik – we’ll be delighted if you’d share your interesting use case during the Meetup. Please send your presentation ideas (speaking time : 5 to 7 minutes) to : meetup@piwik.pro ! Deadline : 20th of July 2015.

  Contact the organisers :

  meetup@piwik.pro