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• libvpx : Cast a pointer to const to squelch a warning

  24 août 2016, par Diego Biurrun

  libvpx : Cast a pointer to const to squelch a warning
  libavcodec/libvpxdec.c:100:57 : warning : passing argument 3 of ’av_image_copy’ from incompatible pointer type
  
           av_image_copy(picture->data, picture->linesize, img->planes,
  
  libavutil/imgutils.h:116:6 : note : expected ’const uint8_t **’ but argument is of type ’unsigned char **’
  
   void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
  

  • [DBH] libavcodec/libvpxdec.c

• How to upload a transcoded file to s3 and create a link to download it

  23 août 2016, par Dotun Longe

  I want to download a video after my module "creates" it by combining a picture and audio file. The output goes to my tmp folder. This works, but I don’t know how to access it.

  My method is to create another Paperclip attachment called "converted" and the module responsible for transcoding should also be responsible for uploading the converted video to a bucket, where I can then access it via @upload.converted.url.

  I have no idea how to go about this, and my eyes hurt from searching. If you have a better way for me to be able to download the transcoded video without this option, I will be open to it.

  Module -> videocreatingproccessor.rb :

   require 'streamio-ffmpeg'
  
   require 'fileutils'
  
  
  
   module VideoCreatingProcessor
  
  
  
   def self.convert_to_video (path_to_audio_file, path_to_image_file)
  
   movie = FFMPEG::Movie.new(path_to_audio_file)
  
   options = {video_codec: "libx264", frame_rate: 60, resolution: "960x720",
  
         x264_vprofile: "high", x264_preset: "slow", pixel_format: "720p",
  
         audio_codec: "libfaac", audio_bitrate: 32, audio_sample_rate: 44100, audio_channels: 2,
  
         threads: 2}
  
    woptions = { watermark: path_to_image_file, resolution: "960x720", watermark_filter: { padding_x: 10, padding_y: 10 } }
  
  
  
   movie.transcode("tmp/output.mp4",woptions ,options )
  
   end

  uploads_controller.rb :

   class UploadsController < ApplicationController
  
   before_action :set_upload, only: [:show, :edit, :update, :destroy]
  
  
  
   def index
  
   @uploads = Upload.all
  
   end
  
  
  
   def paudioaddress
  
   "https:" + @upload.audio.url
  
   end
  
  
  
   def pimageaddress
  
   "https:" + @upload.image.url
  
    end
  
  
  
    def show
  
    require "video_creating_processor"
  
    newvideo =    VideoCreatingProcessor.convert_to_video(paudioaddress,pimageaddress)
  
    end
  
  
  
    ....
  
    end

• af_hdcd : Warn if there is any resampling or format conversion in the link chain

  29 juillet 2016, par Burt P

  af_hdcd : Warn if there is any resampling or format conversion in the link chain
  HDCD is only encoded in s16@44100Hz. Scan the chain of AVFilterLinks
  
  for any resampling or format conversion/truncation that might cause
  
  problems for the filter and issue warnings.
  Signed-off-by : Burt P <pburt0@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/af_hdcd.c