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• use anullsrc in ffmpeg command

  7 juin 2019, par S.T

  I have ffmpeg command that i want to add anullsrc filter to it

  I tried to add the command in different places there but there is always a problem. the command is taking 2 movies and merging them to one movie side by side. the audio is the 2 movies together.

  This is the command :

  ffmpeg -i loop2.mp4 -i loop1.mp4 -i logo.png -filter_complex "[0:v]pad=width=iw+20:height=ih+20:x=10:y=10:color=black[a] ;[1:v]pad=width=iw+20:height=ih+20:x=10:y=10:color=black[b] ;nullsrc=size=640x480[base] ;[a]setpts=PTS-STARTPTS, scale=320x480[left] ;[b]setpts=PTS-STARTPTS, scale=320x480[right] ;[base][left]overlay=shortest=1[tmp1] ;[tmp1][right] overlay=320:0[video] ;[video]overlay=5:5[videoandlogo] ;[0:a]apad [apa] ;[apa][1:a]amerge=inputs=2,pan=stereo|FL

  In the command i have the nullsrc for the video and i want to add also the anullsrc for the audio.
  Can some one help ? Thanks.

  I have a problem when doing this command with the right file (always the right, even if i switched the files), the audio is not synced with the video and i think its because i didn’t use the anullsrc (maybe i am wrong). it happens only on files that i concat them - took one video, and concat it a few times to itself with a different command - loop, and created a new file. the looped video is synced, only the merge is destroying the audio sync (on regular files without loop the sync is good after the merge).
  Thanks.

• Converting bat to bash script [on hold]

  15 juillet 2019, par dezxela

  Please help me with coversion this script from here to bash :
  https://stackoverflow.com/a/38291960/11786146

  This part of the code seems to be reconciled in me, but I’m not sure that it’s correct :

  #  path to ffmpeg
  
  export  ffmpeg='/home/user/bin'
  
  #  source movies from
  
  export  movieSource='/mnt/dev1/radio/Masha'
  
  #  tmp dir
  
  export  tmpDir='/mnt/dev1/radio/Masha'
  
  
  
  
  
  #  setup positon, color, background, font for the text overlays
  
  #  filterComplex, quotes have to be escaped! -> \"
  
  #  BITC - Burned In Time Code
  
  export  filterComplexTimecode='drawtext=fontfile='/usr/share/fonts/truetype/freefont/FreeSerif.ttf': timecode='10\:00\:00\:00': timecode_rate=24: x=(w-tw)/2: y=h-(1*lh)-3: fontsize=20: fontcolor=white@0.4: box=1: boxcolor=0x00000000@0.4: boxborderw=4'
  
  #  Date
  
  export  filterComplexDate='drawtext=fontfile='/usr/share/fonts/truetype/freefont/FreeSerif.ttf': text='%{localtime\:%X}': x=(w-tw-3): y=h-(1*lh)-3: fontsize=20: fontcolor=white@0.4: box=1: boxcolor=0x00000000@0.4: boxborderw=4'
  
  #  Shotname
  
  export  filterComplexShotname='drawtext=fontfile='/usr/share/fonts/truetype/freefont/FreeSerif.ttf': x=0: y=h-(1*lh)+1: fontsize=20: fontcolor=white@0.4: box=1: boxcolor=0x00000000@0.4: boxborderw=4:'
  
  
  
  #  create a list of all files
  
  find "$movieSource" -name "*.mp4" -type f | sort -R | while read j; do echo "file '$j'" >> $tmpDir/filelist.txt; done
  
  
  
  echo filename, durationInSeconds > $tmpDir/fileNameDuration.txt
  
  for file in $movieSource/*.mp4; do
  
    #  Reset current duration to 0 (zero) for each loop
  
    export  curDuration=0
  
    #  get the filename without file extenion
  
    export  fileName=${file##*/}
  
    #  get the duration of a single clip
  
    #  and write it to a tmp textfile
  
    $ffmpeg/ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$file" > $tmpDir/fileTempDuration.txt
  
    #  read the textfile again into a variable
  
   read -p  < $tmpDir/fileTempDuration.txt last curDuration
  
  
  
    #  write the filename and the duration to a new list of all files
  
  echo $fileName,$curDuration >> $tmpDir/fileNameDuration.txt ;done
  
  
  
  #  concate a filter complex string for ffmpeg with all clipnames as textlayer with a inpoint and outpoint
  
  export  filterComplexShotnameCombined=
  
  #  floating numbers are not supported by batch, so we need to work-around that
  
  source  :IntAsFP b=0.000000
  
  for i in $tmpDir/fileNameDuration.txt; do
  
    source  :IntAsFP a=$j
  
    source  :IntToFP inPoint=$b 6
  
    export  c=$(expr a + b)
  
    export   b=c
  
    source  :IntToFP outPoint=$c 6
  
    #  just to check whats going on...
  
    echo name: $i   duration: $j   inPoint: $inPoint   outPoint: $outPoint
  
    export  filterComplexShotnameCombined='$filterComplexShotnameCombined, $filterComplexShotname text=$i: enable=between(t\,$inPoint\,$outPoint^^^)';done

• Video not playing on all browsers (FFMPEG)

  12 février 2021, par Mithradantor

  For days I have been struggeling with ffmpeg (PHP).

  


  I have a website where users can upload video's. Obviously people use .mov, .mp4 and .mpeg created by various devices such as cameras, mobile telephones, tablets and many more devices. The problem I have is that those movies either work on Firefox or Chrome, but almost never on both. No clue why, I guess it has to do with codecs and browser support.

  


  I am using FFMpeg to turn them into webm files. This works 95% of the time. In all browsers I have a working video and the sound works too. But sometimes there is no sound at all.

  


  When I open the movie in a other browser (or Windows media player for example) I do hear sound. It is so random to in what browser or software it works or does not work.

  


  Does anyone know of a way to make sure that your movies work in every browsers i.e. Chrome, FireFox and Safari with both video and audio ? and if so, how can I transform them and into what format (codecs ?)

  


  I dont mind converting a movie into three different formats, as long as both video and audio works.

  


  I hope someone can give me some advice. I have tried many ways but none work cross-browser so far.

  


  An example of the code that I use :

  


  $video->save(new FFMpeg\Format\Video\WebM(), 'export-webm.webm');


  


  Does anyone know how I can make it work on every browser ?

  


  What I already tried is (amongst others) :

  


  using an original mp3 or mov and convert it into webm with this code :

  


  ffmpeg -i origin.mov -c:a libvorbis -strict -2 -c:v libvpx-vp9 output.webm

  


  Unfortunately in FireFox i have visual and audio but in Chrome I have nothing, just a blank screen.