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• FFmpeg continues to process after time specified at "-to"

  4 août 2020, par Yamahabest

  I have a video, where I want to cut a part from the beginning, and from the end. And I want to apply some fade ins/fade outs, and add some text.

  


  So, I came up with the following syntax :

  


  -ss 10 -to 40 
-i "D:\DATA\Software\VideoProcessor_Files\20171015 Zelhem Tandem Frans met Mirthe.MP4" 
-loop 1 -i "Input_Files\logo maurik large.png" 
-loop 1 -i "Input_Files\logo maurik small.png" 
-filter_complex "
    color=0x7F7F7F@0.95:1920x1080[grey_for_fade_out];
    [grey_for_fade_out]fade=t=out:st=12:d=2:alpha=1[grey_fade_out];
    [0:v][grey_fade_out]overlay[video_grey_fade_out];
    color=0x7F7F7F@0.95:1920x1080[grey_for_fade_in];
    [grey_for_fade_in]fade=t=in:st=37:d=2:alpha=1[grey_fade_in];
    [video_grey_fade_out][grey_fade_in]overlay[video_grey_fade_out_in];
    [1:v]fade=t=out:st=13:d=2:alpha=1[over];
    [over]scale=iw/1.5:-1[scaled];
    [video_grey_fade_out_in][scaled]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/10[video_grey_fade_out_in_logo];
    [1:v]fade=t=in:st=36:d=2:alpha=1[over2];
    [over2]scale=iw/1.5:-1[scaled2];
    [video_grey_fade_out_in_logo][scaled2]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2[video_grey_fade_out_in_logo2];
    [2:v]colorchannelmixer=aa=0.5,fade=t=in:st=14:d=2:alpha=1,fade=t=out:st=35:d=2:alpha=1[over3];
    [over3]scale=iw/10:-1[scaled3];
    [video_grey_fade_out_in_logo2][scaled3]overlay=10:10[video_complete];
    [video_complete]drawtext=fontfile=Input_Files/Sansation-Bold.ttf:text='Tandemvlucht met Mirthe':fontsize=96:fontcolor=white:alpha='if(lt(t,11),1,(2-(t-11))/2)':x=(w-text_w)/2:y=((h-text_h)/2)+125,drawtext=fontfile=Input_Files/Sansation-Bold.ttf:text='Zeddam':fontsize=96:fontcolor=white:alpha='if(lt(t,11),1,(2-(t-11))/2)':x=(w-text_w)/2:y=((h-text_h)/2)+250,drawtext=fontfile=Input_Files/Sansation-Bold.ttf:text='4 augustus 2020':fontsize=96:fontcolor=white:alpha='if(lt(t,11),1,(2-(t-11))/2)':x=(w-text_w)/2:y=((h-text_h)/2)+375,drawtext=fontfile=Input_Files/Sansation-Bold.ttf:text='Ook een keer meevliegen?':fontsize=96:fontcolor=white:alpha='if(lt(t,37),0,(t-37)/2)':x=(w-text_w)/2:y=((h-text_h)/6),drawtext=fontfile=Input_Files/Sansation-Bold.ttf:text='Of bel 085 - 049 55 69':fontsize=96:fontcolor=white:alpha='if(lt(t,37),0,(t-37)/2)':x=(w-text_w)/2:y=((h-text_h)/2)+350"
-preset medium 
-crf 18 
-c:a copy 
-y ".\Output_Files\Video\Zeddam\2020-08-04\Mirthe\27ed390a-8497-4550-b93f-4f87d9f2c9f0\MP_Tandemvlucht met_Mirthe_Zeddam_2020-08-04.mp4"


  


  I am quite sure this has worked in the past, but now FFmpeg just keeps on processing endlessly. If I then stop the FFmpeg process, and look at the resulting file, I see that the last frame (of the end of the specified period) just keeps on duplicating.

  


  The drop counter in the console output of FFmpeg also starts increasing at the end of the specified period :

  


  frame=  987 fps= 15 q=-1.0 Lsize=   31357kB time=00:00:41.04 bitrate=6259.0kbits/s dup=0 drop=10 speed=0.644x


  


  I am kind of lost on why this doesn't work anymore. I might have upgraded the FFmpeg executable in the mean time. Maybe my syntax was/is not correct, but I believe it just worked.

  


  It has to be in the complex filter, because when I remove that, it works alright.
It is not in the drawtext part of the complex filter, because it still occurs when I remove that. And when I only do the drawtext, FFmpeg stops correctly at the specified time.

  


  I have tried this, but then it still occurs :

  


  -filter_complex "
    color=0x7F7F7F@0.95:1920x1080[grey_for_fade_out];
    [grey_for_fade_out]fade=t=out:st=12:d=2:alpha=1[grey_fade_out];
    [0:v][grey_fade_out]overlay[video_grey_fade_out];
    color=0x7F7F7F@0.95:1920x1080[grey_for_fade_in];
    [grey_for_fade_in]fade=t=in:st=37:d=2:alpha=1[grey_fade_in];
    [video_grey_fade_out][grey_fade_in]overlay"


  


  Also with this, it still occurs :

  


  -filter_complex "
    [1:v]fade=t=out:st=13:d=2:alpha=1[over];
    [over]scale=iw/1.5:-1[scaled];
    [0:v][scaled]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/10[video_grey_fade_out_in_logo];
    [1:v]fade=t=in:st=36:d=2:alpha=1[over2];
    [over2]scale=iw/1.5:-1[scaled2];
    [video_grey_fade_out_in_logo][scaled2]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2[video_grey_fade_out_in_logo2];
    [2:v]colorchannelmixer=aa=0.5,fade=t=in:st=14:d=2:alpha=1,fade=t=out:st=35:d=2:alpha=1[over3];
    [over3]scale=iw/10:-1[scaled3];
    [video_grey_fade_out_in_logo2][scaled3]overlay=10:10"


  


  I just don't understand. All my fade-ins/-outs seem to be within the specified range :

  


  

  • fade=t=out:st=12:d=2 : start at 12 seconds, duration 2 seconds. This ends at 14 seconds, which is smaller than 40 seconds.

  


  • fade=t=in:st=37:d=2 : start at 37 seconds, duration 2 seconds. This ends at 39 seconds, which is smaller than 40 seconds.

  


  • fade=t=out:st=13:d=2 : start at 13 seconds, duration 2 seconds. This ends at 15 seconds, which is smaller than 40 seconds.

  


  • fade=t=in:st=36:d=2 : start at 36 seconds, duration 2 seconds. This ends at 38 seconds, which is smaller than 40 seconds.

  


  


  It is just like some sequence is not ended properly, which is causing FFmpeg to just continue.

  


• About the delay of Electron playing FFpmeg transcoded video

  26 juillet 2020, par Yohann

  In the Electron project, you need to try to play the video screen of the camera

  


  The camera is Haikang’s webcam

  


  Get real-time video stream through RTSP protocol

  


  rtsp://admin:admin@192.168.0.253/main/Channels/

  


  There will be a delay of about 3s when playing through the VLC player

  


  Then when used in the project, create a websocket service in Electron through the main process, decode the rtsp video through fluent-ffmpeg, and convert it to flv stream and push it to the rendering process

  


  import * as express from 'express'
import * as expressWebSocket from 'express-ws'
import ffmpeg from 'fluent-ffmpeg'
import webSocketStream from 'websocket-stream/stream'
const path = require('path')

let ffmpegPath
if (process.env.NODE_ENV === 'development') {
  ffmpegPath = path.join(__static, 'ffmpeg', 'bin', 'ffmpeg.exe')
} else {
  ffmpegPath = path.join(process.cwd(), 'ffmpeg', 'bin', 'ffmpeg.exe')
}
ffmpeg.setFfmpegPath(ffmpegPath)

// Start video transcoding service
function videoServer () {
  let app = express()
  app.use(express.static(__dirname))
  expressWebSocket(app, null, {
    perMessageDeflate: true
  })
  app.ws('/rtsp/', rtspRequestHandle)
  app.listen(8888)
  console.log('Create a monitoring service')
}

//RTSP transcoding method
function rtspRequestHandle (ws, req) {
  console.log('rtsp request handle')
  const stream = webSocketStream(ws, {
    binary: true,
    browserBufferTimeout: 1000000
  },
  {
    browserBufferTimeout: 1000000
  })
  let url = req.query.url
  console.log('rtsp url:', url)
  try {
    ffmpeg(url)
      .addInputOption('-rtsp_transport', 'tcp', '-buffer_size', '102400') // Here you can add some RTSP optimized parameters
      .outputOptions([
        '-fflags',
        'nobuffer',
        '-tune',
        'zerolatency'
      ])
      .on('start', function () {
        console.log(url, 'Stream started.')
      })
      .on('codecData', function () {
        console.log(url, 'Stream codecData.')
      })
      .on('error', function (err) {
        console.log(url, 'An error occured: ', err.message)
      })
      .on('end', function () {
        console.log(url, 'Stream end!')
      })
      .outputFormat('flv').videoCodec('copy').noAudio().pipe(stream)
  } catch (error) {
    console.log(error)
  }
}

export default videoServer


  


  The rendering process parses the video stream and plays the video through flv.js

  


  <template>&#xA;  <div class="video">&#xA;    <video class="video-box" ref="player"></video>&#xA;  </div>&#xA;</template>&#xA;&#xA;<code class="echappe-js">&lt;script&gt;&amp;#xA;  import flvjs from &amp;#x27;flv.js&amp;#x27;&amp;#xA;  export default {&amp;#xA;    name: &amp;#x27;videopage&amp;#x27;,&amp;#xA;    props: {&amp;#xA;      rtsp: String&amp;#xA;    },&amp;#xA;    data () {&amp;#xA;      return {&amp;#xA;        player: null&amp;#xA;      }&amp;#xA;    },&amp;#xA;    mounted () {&amp;#xA;      console.log(flvjs.isSupported())&amp;#xA;      if (flvjs.isSupported()) {&amp;#xA;        let video = this.$refs.player&amp;#xA;        console.log(video)&amp;#xA;        if (video) {&amp;#xA;          this.player = flvjs.createPlayer({&amp;#xA;            type: &amp;#x27;flv&amp;#x27;,&amp;#xA;            isLive: true,&amp;#xA;            url: &amp;#x27;ws://localhost:8888/rtsp/?url=&amp;#x27; &amp;#x2B; this.rtsp&amp;#xA;          }, {&amp;#xA;            enableStashBuffer: true&amp;#xA;          })&amp;#xA;          console.log(this.player)&amp;#xA;          this.player.attachMediaElement(video)&amp;#xA;          try {&amp;#xA;            this.player.load()&amp;#xA;            this.player.play()&amp;#xA;          } catch (error) {&amp;#xA;            console.log(error)&amp;#xA;          }&amp;#xA;        }&amp;#xA;      }&amp;#xA;    },&amp;#xA;    methods: {&amp;#xA;      getCurrentFrame () {&amp;#xA;        let video = this.$refs.player&amp;#xA;        let scale = 1&amp;#xA;        let canvas = document.createElement(&amp;#x27;canvas&amp;#x27;)&amp;#xA;        canvas.width = video.videoWidth * scale&amp;#xA;        canvas.height = video.videoHeight * scale&amp;#xA;        canvas.getContext(&amp;#x27;2d&amp;#x27;).drawImage(video, 0, 0, canvas.width, canvas.height)&amp;#xA;        return canvas.toDataURL(&amp;#x27;image/png&amp;#x27;)&amp;#xA;      }&amp;#xA;    },&amp;#xA;    beforeDestroy () {&amp;#xA;      this.player &amp;amp;&amp;amp; this.player.destory &amp;amp;&amp;amp; this.player.destory()&amp;#xA;    }&amp;#xA;  }&amp;#xA;&lt;/script&gt;&#xA;&#xA;&#xA;

  


  Then there will be a delay of about 3s when playing, and the delay will increase with the playing time

  


  There will be a delay of 10 minutes in the later period

  


  Is there any way to control this delay time

  


  Or is there any other decoding scheme that can be used ?

  


  Solutions that can support electron

  


• bash - forcing globstar asterisk expansion when passed to loop

  1er juillet 2020, par Kittywhiskers Van Gogh

  I am attempting to write a script that finds the extension of all files within a directory and normalise them using ffmpeg to conform to a singular file format, codec and resolution.

  


  #!/usr/bin/env bash

# We need to use globstar because we want to run this recursively (bash >4.0)
# This script won't run on macOS unless you install bash from homebrew
shopt -s globstar nullglob

# macOS doesn't have some stuff that we need, presuming you have homebrew already
# then run "brew install ffmpeg rename"
if ! [ -x "$(command -v ffmpeg)" ] || ! [ -x "$(command -v rename)" ]; then
  echo 'Required applications are absent, quitting :(' >&2
  exit 1
fi

# We need to know what file extensions we are dealing with
DISCOVERED_EXTENSIONS=$(find . -type f -name '*.*' | sed 's|.*\.||' | sort -u | tr '\n' ' ' | sed "s| | ./\**/*.|g" | rev | cut -c9- | rev | echo "./**/*.$(stdin)")

# Let's ignore newlines for now
IFS=$'\n'; set -f

# Within the loop
for f in $(echo $DISCOVERED_EXTENSIONS | tr ' ' '\n'); do
# Do nothing if there are no files to begin with
#    if [ -z ${f+x} ]; then
#        echo "no files found, exiting";
#    else
# First get rid of all period/full-stops except the extension to prevent confusion
#        rename "s/\.(?=[^.]*\.)/_/g" "$f";
# Now run conversion and save files with prefix processed_
#        ffmpeg -i "$f" -vf scale=-1:720 -crf 18 \
#        -c:v libx264 -preset veryslow -c:a libvo_aacenc -b:a 128k -c:s copy \
#        "processed_${f%.*}.mp4";
#    fi
  ls $f;
done

# No longer ignore newlines
unset IFS; set +f

# Stop using recursiveness after we're done
shopt -u globstar nullglob


  


  I have commented out all the actual conversion code in an attempt to debug it, running this script alone, I get :

  


  ls: ./**/*.avi: No such file or directory
ls: ./**/*.jpg: No such file or directory
ls: ./**/*.mkv: No such file or directory
ls: ./**/*.mp4: No such file or directory


  


  It is passing ls "./**/*.avi" instead of ls ./**/*.avi (because of no variable expansion). I attempted to use eval, envsubst and even used a custom expand function, to no avail

  


  The result of echo "$DISCOVERED_EXTENSIONS" is :

  


  ./**/*.avi ./**/*.jpg ./**/*.mkv ./**/*.mp4


  


  ShellCheck objected to my lack of quotation marks but adding them in did not do anything. What changes can be recommended so that value of $f is the result of glob expansion and not the expression itself ?