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• Fluent-ffmpeg randomly doesn't add the text I want to the video, even though it's in the filters

  15 décembre 2022, par ToborWinner

  I am making a simple script to add some text to a 4 seconds video, it all works fine, but sometimes it randomly doesn't add some of the text.
You can find here the relevant parts of my code :

  


  
const video = ffmpeg('path/to/video.mp4')

let index = 0
let left = true

const filters = [{
  filter: 'drawtext',
  options: {
    //fontfile:'font.ttf',
    text: title,
    fontsize: 30,
    fontcolor: 'white',
    x: '(main_w/2-text_w/2)',
    y: 130,
    shadowcolor: 'black',
    shadowx: 2,
    shadowy: 2
  }
}]

for (let thought of thoughts) {
    if (thought.length == 0) {
      continue
    }
    thought = wrap(thought, {width: 35})
    const strings = thought.split("\n")
    let line = 0
    for (const string of strings
      .filter(string => string.length > 0)
      .map(string => string.trim())
      ) {
      let yoffset = 130+(130*(index+1))+(line*20)
      if (yoffset < 0) {
        yoffset = 0
      }
      console.log(string, yoffset)
      filters.push({
        filter: 'drawtext',
        options: {
          //fontfile:'font.ttf',
          text: string,
          fontsize: 18,
          fontcolor: 'white',
          x: `(main_w${left ? "*0.3" : "*0.7"}-text_w/2)`,
          y: yoffset,
          shadowcolor: 'black',
          shadowx: 2,
          shadowy: 2
        }
      })
      line++;
    }
    index++;
    left = !left
  }


video.videoFilters(filters)
video.noAudio()


video.save('path/to/output.mp4');



  


  The wrap function comes from the package word-wrap (const wrap = require('word-wrap');)
Thoughts is a list of strings that aren't too long (with the wrap function they end up being like 2-4 lines).

  


  This is inside an async function.

  


  For some reason only a few lines appear on the output video.
Sometimes, when it doesn't do that, it also throws an error saying that one of the inputs is invalid (while processing filters).
The wrap function seems to work, and also the yoffset, I have printed them.

  


  If someone has an idea why, please help me solve this.

  


  I tried chasing the text in thoughts, and for example, this works with no problems (shows the title, and the texts right, left, right, left, ...).

  


  const thoughts = ["Nothing is on fire, fire is on things","Nothing is on fire, fire is on things","Nothing is on fire, fire is on things","Nothing is on fire, fire is on things","Nothing is on fire, fire is on things"]


  


• Search pre-defined words in live stream video

  31 janvier 2018, par Brajraj Agrawal

  I want to search for some pre-defined keywords in youtube live stream ( or some other live stream) in my application.
  I have gone through the many articles. I just have a URL that is a live streaming URL and a set of keywords. If any of that keywords appear in the video I just want the user to provide a link to jump to that frame where the keyword appears in as real-time as possible.

  My understanding for that is to use Google Speech API and FFMPEG. But I am confused how can I do playback and which HTML player should I use for that.

  E.g. A video is streaming live and If a word "dog" is spoked in the video then the user should get notify with playback URL from 5 sec behind it appears in the video.

  Please suggest

• Revision f332c6305e : Renames interface field in VpxInterface Renames interface to codec_interface si

  16 juillet 2014, par Deb Mukherjee

  Changed Paths :
   Modify /examples/decode_to_md5.c

  
   Modify /examples/decode_with_drops.c

  
   Modify /examples/postproc.c

  
   Modify /examples/set_maps.c

  
   Modify /examples/simple_decoder.c

  
   Modify /examples/simple_encoder.c

  
   Modify /examples/twopass_encoder.c

  
   Modify /examples/vp8cx_set_ref.c

  
   Modify /examples/vpx_temporal_svc_encoder.c

  
   Modify /tools_common.h

  
   Modify /vpxdec.c

  
   Modify /vpxenc.c

  
  
  Renames interface field in VpxInterface

  Renames interface to codec_interface since it is a reserved
  word on windows.

  Change-Id : I84f2cbf257a4c44f16dc2464127e35ee405c2c3e