Recherche avancée

Sur d’autres sites (8696)

• Reusing FFMPEG AVFilterGraph

  11 avril 2022, par Sapozhnikov Andrey

  In my code I apply same filtering on multiple input files. In first version of code I created AVFilterGraph for every input, but I think these actions might be excessive.
  
However, when I try to reuse the same graph, I face with the error during sending frame to abuffer filter. At the previous iteration over input files, I passed EOF to it for flushing, and the av_buffersrc_add_frame function has a check for this :

  


  BufferSourceContext *s = ctx->priv;
...
if (s->eof)
    return AVERROR(EINVAL);


  


  which crashes the execution on the second iteration.
Unfortunately, I couldn't find any functions that can restore buffer filter or something like that.

  


  I would like to know if avfilter implies the possibility to reuse once created filter graph, or there are some fundamental misconceptions in my understanding of ffmpeg logic by passing input after EOF.

  


  Thank you !

  


• Python Docker SDK long command to container [duplicate]

  2 avril 2021, par Neil Bernard

  I need to send a fairly long command using python docker SDK

  


  ffmpeg -f lavfi -re -i smptebars=duration=60:size=1280x720:rate=30 -f lavfi -re -i sine=frequency=1000:duration=60:sample_rate=44100 -pix_fmt yuv420p -c:v libx264 -b:v 1000k -g 30 -keyint_min 120 -profile:v baseline -preset veryfast -f mpegts "srt://127.0.0.1:4200?pkt_size=1316"


  


  I have an example where you ned to wrap each element in double quotes.

  


  container1 = client.containers.run("alpine", ["echo", "hello", "world"],name='autotest', detach=True)


  


  2 Questions

  


  Is there an elegant way to do this ?
If not how do I handle the bits that already have quotes ?

  


• 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