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• drawbox : Respect thickness parameter

  12 juin 2013, par Jean Delvare

  drawbox : Respect thickness parameter
  The drawbox video filter is drawing lines one pixel thinner than
  
  requested. The default thickness is 4 pixel but in fact the lines
  
  drawn by default are only 3 pixel wide.
  Change the comparisons in the code to fix this off-by-one bug. Also
  
  change the default thickness from 4 to 3 to minimize the unexpected
  
  changes from the user’s perspective.
  As I was already touching these lines, I also removed the "maximum" in
  
  the thickness parameter description, as I don’t think it was adding
  
  any value and I even found it confusing.
  Reviewed-by : Andrey Utkin <andrey.krieger.utkin@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_drawbox.c

• Idea on how to make video maker website ?

  13 octobre 2015, par Gulam Gajani

  I want to create website that create video and user can share that website in any social site.

  (example sites :

  1. flixpress.com
  2. studio.stupeflix.com
  3. www.photodex.com
  4. www.picovico.com )

  this type of website i want to create.After long research and come to conclusion to use imagemagick and ffmpeg for my website.I learn the basic of the ffmpeg and imagemagick.
  SO I create code like this
  for text overlay in ffmpeg i create code like this

     ffmpeg -i input.mp4 -vf drawtext="fontfile=/usr/share/fonts/TTF/Vera.ttf: \
  
          text='Stack Overflow': fontcolor=white: fontsize=24: box=1: boxcolor=black: \
  
          x=(w-text_w)/2: y=(h-text_h-line_h)/2" -codec:a copy output.flv

  and for imagemagick use convert to make pics and make slideshow with ffmpeg code.

   shell_exec(" ffmpeg -framerate 1*10 -i %d.png -c:v libx264 -r 30 -pix_fmt yuv420p out1.mp4");

  This code works fine.No error, nothing.
  But the output video does not have the quality that i wanted.
  My question is that for create website like i mentioned above.Am i using the right software (ffmpeg and imagemagick).what software or code this type of website used ? Any idea ? any opensource software or program for this ?
  I am just newbie and try to learn the things.
  Please provide guidance on this what i am doing wrong.Just give the software name of programe which is used for this type of website. I can go through by myself. Please Give some idea on this.

• passing additional values to s3 event notification for lambda consumption

  8 septembre 2017, par user1790300

  I have to write code in react-native that allows a user to upload videos to amazon s3 to be transcoded for consumption by various devices. For the processing after the upload occurs ; I am reviewing two approaches :

  1) I can use Lambda with ffmpeg to handle the transcoding immediately after the uploading occurs (my fear here would be the amount of time required to transcode the videos and the effect on pricing if it takes a considerable amount of time).

  2) I can have s3 pass an sns message to a rest api after the created event occurs and the rest api generate a rabbitmq message that will be processed by worker that will perform the transcoding using ffmpeg.

  Option 1) seems to be the preferable option based on a completion time perspective. How concerned should I be with using 1) considering how long video transcoding might take as opposed to option 2) ?

  Also, regardless, I need a way to pass additional parameters to lambda or along the sns messaging that would allow me to somehow associate the user who uploaded the video with their account. Is there a way to pass additional text-based values to s3 to pass along to lambda or along sns when the upload completes, as a caveat I plan to upload the video directly to s3 using the rest layer(found this answer here : http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html#RESTObjectPUT-responses-examples) ?