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• ffmpeg Input link in1:v0 parameters do not match the corresponding output link in0:v0 parameters

  13 décembre 2017, par Anuj TBE

  I’m using ffmpeg to generate slideshow with images input from web

  ffmpeg  \
  
  -loop 1 -t 5 -i https://eample.com/image_1.jpg \
  
  -loop 1 -t 5 -i https://eample.com/image_2.jpg \
  
  -loop 1 -t 5 -i https://eample.com/image_3.jpg \
  
  -loop 1 -t 5 -i https://eample.com/image_4.jpg \
  
  -loop 1 -t 5 -i https://eample.com/image_5.jpg \
  
  -filter_complex \
  
  "[0:v]setdar=16/9,fade=t=out:st=4:d=1[v0]; \
  
   [1:v]setdar=16/9,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v1]; \
  
   [2:v]setdar=16/9,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v2]; \
  
   [3:v]setdar=16/9,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v3]; \
  
   [4:v]setdar=16/9,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v4]; \
  
   [v0][v1][v2][v3][v4]concat=n=5:v=1:a=0,format=yuv420p[v]" -map "[v]" out.mp4

  But after processing the videos, it gives error as

  [Parsed_concat_14 @ 0x3e5e9e0] Input link in1:v0 parameters (size 1024x709, SAR 709:576) do not match the corresponding output link in0:v0 parameters (500x281, SAR 1124:1125)
  
  [Parsed_concat_14 @ 0x3e5e9e0] Failed to configure output pad on Parsed_concat_14
  
  Error configuring complex filters.
  
  Invalid argument

  Is it related to scaling of images, since images could be different dimensions.

  Also, how to scale the images to fit 16:9 ratio may be using crop or fit ?

• ffmpeg : match audio video duration post concatenation

  20 janvier 2020, par Massimo Vantaggio

  I wrote this bash to automate concatentation of videos for dash mpeg streaming infinite loop.
  Im unable to obtain same duration for audio and video, with the videos that i’m using for testing i get always 6 ms more for audio track.
  May ask help to debug it and understand how to get same duration for both audio and video track ?

  #!/bin/bash
  
  #CANCAT 0.3
  
  
  
  cd input
  
  fps=()
  
  # GET FPS OF EACH VIDEO INTO ARRAY
  
  for f in *.mp4; do
  
      _f=$(ffmpeg -i "$f" 2>&1 | sed -n "s/.*, \\(.*\\) fp.*/\\1/p")
  
      fps+=("$_f")
  
  done
  
  
  
  #GET NUMBER OF ELEMENTS IN FPS ARRAY  
  
  tLen=${#fps[@]}
  
  #CHECK FPS EQUALITY     
  
  for tLen in "${fps[@]:1}"; do
  
      if [[ $tLen != ${fps[0]} ]]; then
  
          printf "WARNING: VIDEO’S FRAME-RATE ARE NOT EQUALS, THE PROCESS CAN’T START."
  
          printf "%s\\0" "${fps[@]}" |
  
              sort -zu |
  
              xargs -0 printf " %s"
  
          printf "\\n"
  
         exit 1
  
      fi
  
  done
  
  
  
  #AUDIO ENCODING
  
  for f in *.mp4; 
  
  do
  
  NAME=$(echo "$f" | cut -d'.' -f1) 
  
  ffmpeg -y -i "$f" -c copy -video_track_timescale 90k -c:a aac -b:a 384k -ar 44100 -ac 2 -shortest -af aresample=async=1 ../buffer/${NAME}_buffer.mp4
  
  done
  
  #-af aresample=async=1000
  
  #-filter_complex " [1:0] apad "
  
  
  
  cd ..
  
  cd buffer
  
  times=()
  
  for f in *.mp4; 
  
  do 
  
  echo "file '$f'" >> list.txt;
  
  
  
  # GET DURATION OF EACH VIDEO
  
  _t=$(ffprobe -i "$f" -show_entries format=duration -v quiet -of csv="p=0")
  
  times+=("$_t")
  
  done
  
  
  
  #SUM ALL DURATIONS
  
  TOTALDURATION=$( echo "${times[@]}" | sed 's/ /+/g' | bc )
  
  DURROUND=$(echo "$TOTALDURATION" | cut -d'.' -f1)
  
  TOTDELTA="$((DURROUND%2))"
  
  TOTDUR="$(($DURROUND-$TOTDELTA))"
  
  
  
  #GET FPS
  
  FPS="$(ffmpeg -i ${f[0]} 2>&1 | sed -n "s/.*, \(.*\) fp.*/\1/p")"
  
  #ROUND FPS
  
  FPSC=$( echo "($FPS+0.5)/1" | bc )
  
  #GET GOP
  
  GOP="$((FPSC*2))"
  
  
  
  #ENCODING MASTER TRACK
  
  ffmpeg -f concat -safe 0 -y -i list.txt -loop 1 -i ../logo/logo.png -c:a copy -c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -r $FPSC -b:v 4800k -maxrate 9600k -bufsize 19200k -profile:v main -crf 22 -filter_complex "[0:v][1:v]overlay=main_w-overlay_w-10:10,scale=1920:1080,setsar=1" -t $TOTDUR 1080set.mp4 
  
  
  
  #EXTRACTING AUDIO FROM MASTER VIDEO TRACK
  
  ffmpeg -y -i 1080set.mp4 -c copy -vn ../output/output_audio.mp4
  
  
  
  #REMOVE AUDIO FROM MASTER VIDEO TRACK
  
  ffmpeg -y -i 1080set.mp4 -c copy -an ../output/output_1080.mp4
  
  
  
  #CLEAN BUFFER
  
  rm *.mp4
  
  rm *.txt
  
  
  
  cd .. 
  
  cd output
  
  
  
  #ENCODE 720p
  
  ffmpeg -y -i output_1080.mp4 -an -c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -s 1280x720 -r $FPSC -b:v 2400k -maxrate 4800k -bufsize 9600k -profile:v main -crf 22 output_720.mp4
  
  
  
  #ENCODE 360p
  
  ffmpeg -y -i output_1080.mp4 -an -c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -s 640x360 -r $FPSC -b:v 800k -maxrate 1600k -bufsize 3200k -profile:v main -crf 22 output_360.mp4
  
  
  
  #VALIDATOR
  
  echo 1080p ENCODING
  
  echo GOP:   $GOP 
  
  echo VIDEO FORMAT CONTAINER DURATION:   
  
  ffprobe -v error -show_entries format=duration \
  
    -of default=noprint_wrappers=1:nokey=1 output_1080.mp4
  
  echo VIDEO STREAM DURATION:
  
  ffprobe -v error -select_streams v:0 -show_entries stream=duration \
  
    -of default=noprint_wrappers=1:nokey=1 output_1080.mp4
  
  echo AUDIO FORMAT CONTAINER DURATION:   
  
  ffprobe -v error -show_entries format=duration \
  
    -of default=noprint_wrappers=1:nokey=1 output_audio.mp4
  
  
  
  echo ______________________________________________________________
  
  
  
  echo 720p ENCODING
  
  echo GOP:   $GOP 
  
  echo VIDEO FORMAT CONTAINER DURATION:   
  
  ffprobe -v error -show_entries format=duration \
  
    -of default=noprint_wrappers=1:nokey=1 output_720.mp4
  
  echo VIDEO STREAM DURATION:
  
  ffprobe -v error -select_streams v:0 -show_entries stream=duration \
  
    -of default=noprint_wrappers=1:nokey=1 output_720.mp4
  
  echo DONE
  
  exit 1

  Here the script with my videos for test and relative folders :
  https://gofile.io/?c=WPAC0Q

• Handling multiple line subtitles of Right aligned languages(arabic) in Moviepy

  24 décembre 2023, par Stanger Danger

  I am trying to add Arabic subtitles on a video using Moviepy. The issue I'm facing is related to alignment of Arabic text, as it progresses from right to left, instead of left to right in English language.

  


  

  


  As text length gets more and more, Moviepy trims the words from both ends, this issue can be resolved if we break the text into multiple lines. This works well for English language but for Arabic, the first line becomes the last line because of the (Right-Left)alignment.

  


  

  


  The text on Second line should come first on the first line at the start, while end chuck of first text towards the left corner should render on the second line, but it is getting rendered as English language, Left to right alignment.

  


  Here is my code :

  


  def add_subtitles(address_subtitles, address_video):
  video = VideoFileClip(address_video)
  generator = lambda txt: TextClip(txt, font='Arial', fontsize=22, color='black', stroke_width=2, method='caption', align='south', size=video.size)
  subtitles = SubtitlesClip(address_subtitles, generator)
  #print()

  result = CompositeVideoClip([video, subtitles.set_pos(('center','bottom'))])
  result.write_videofile("arabic_with_hardcoded_subtitles_3.mp4", fps=video.fps, temp_audiofile="temp-audio.m4a", remove_temp=True, codec="libx264"
  , audio_codec="aac")