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• Trying to change extension of filename on an ffmpeg script

  22 janvier 2019, par prat67

  (first time posting a question here)

  So I’m looking to write a ffmmpeg script to automate encoding my files to VP9.
  The problem I’m having is when I try to strip the extension and add a new one.

  For example
  Demo.mp4

  Should change to
  Demo.webm

  I’m running this on a Ubuntu-16.04 (Server Non-GI Version)
  I’ve tried a few different ways to accomplish this (using google and other posts on StackOverflow) but I can’t seem to make it work

  This is the error I keep getting..

  line 31 : Demo.mp4+.vp9 : syntax error : invalid arithmetic operator (error token is ".mp4+.vp9")

  I’ve also commented (in the code below) where the syntax error is pointing to..

  #!/bin/bash
  
  
  
  # Welcome Message
  
  
  
  clear
  
  printf "====================================\n"
  
  printf "FFMPEG Encoder\n"
  
  printf "(Using HDR-4k Profile)\n"
  
  printf "====================================\n\n"
  
  printf " Loading Files in Current Directory...\n\n"
  
  sleep 3s
  
  
  
  
  
  # Variables
  
  
  
  i=1
  
  ext=".webm"
  
  vadd=4000000
  
  vsub=2000000
  
  
  
  
  
  # Iterate through files in current directory
  
  
  
  for j in *.{mp4,mkv};
  
  do
  
  echo "$i.$j"
  
  file[i]=$j
  
  i=$(( i + 1 ))
  
  done
  
  
  
  
  
  # Select File & Bitrate
  
  
  
  printf "Enter file number\n"
  
  read fselect
  
  printf "${file[$fselect]}: Selected for encoding\n\n"
  
  
  
  printf "Enter Average Bitrate (Eg: 8000000)\n\n"
  
  read bselect
  
  
  
  
  
  # ***THIS IS WHERE THE PROBLEM IS***
  
  # Prepare output file, strip trailing extension (eg .mkv) and add .webm
  
  
  
  ftemp1="${file[$fselect]}"
  
  ftemp2="${ftemp1::-4}"
  
  fout="$(($ftemp2+$ext))"
  
  printf "Output file will be: $fout"
  
  printf "Preparing to encode..."
  
  sleep 5s
  
  
  
  
  
  # Encode with User-Defined Parameters
  
  
  
  ffmpeg -y -report -i ${file[$fselect]} -b:v $bselect -speed 4 -pass 1 \
  
    -pix_fmt yuv420p10le \
  
    -color_primaries 9 -color_trc 16 -colorspace 9 -color_range 1 \
  
    -maxrate "$(($bselect+$vadd))" -minrate "$(($bselect-$vsub))" \
  
    -profile:v 2 -vcodec libvpx-vp9 -f webm /dev/null && \
  
  ffmpeg -y -report -i ${file[$fselect]} -b:v $bselect -pass 2 \
  
    -pix_fmt yuv420p10le \
  
    -color_primaries 9 -color_trc 16 -colorspace 9 -color_range 1 \
  
    -maxrate "$(($bselect+$vadd))" -minrate "$(($bselect-$vsub))" \
  
    -profile:v 2 -vcodec libvpx-vp9 \
  
  $fout

  I’m certain there is a much cleaner way to do this - but I’m not expecting help with that :P

  My suspicion is that I’m trying to add two different types of variables ? But I thought I defined them as strings..I could be wrong

  Please Help... lol

• How to create video and audio files for the Media Source Extension API ?

  5 décembre 2018, par Aman

  I have created a video player from the Media Source Extension API. I have split the video and audio from the original.mp4 (1 minute duration). I have split the video and audio into small 5 second files (12 files in total). I’m getting each one of them and playing them together. But the video stops playing at around 45-47 seconds. I cannot understand to why the video is stopping/buffering. I cannot understand whether the problem is in the javascript code or the video files ?

  I have uploaded all the resources here (https://drive.google.com/file/d/1NHc_yNRU0tvaU18aohLy74Js3y7UHD4N/view?usp=sharing). And written the commands I used to construct my video and audio files below. I have also noticed that this problem only occurs with Google Chrome and works perfectly and smoothly on Microsoft Edge. Thanks

  Making the Media files:

  Extracting video from original.mp4: MP4Box -single 1 original.mp4

  Extracting audio from original.mp4: MP4Box -single 2 original.mp4

  Splitting the video and audio into 5 second parts: ffmpeg -ss starting-time -to end-time -i (video.mp4 OR audio.mp4) (video_part.mp4 OR audio_part.mp4)

  Fragmenting all the video and audio parts: MP4Box -dash 1000 -rap -frag-rap(video_part.mp4 OR audio_part.mp4)

  Then using the fragmented video and audio files to be played via the Media Source Extension API video player. e.g. (video_part_dashinit.mp4 OR audio_part_dashinit.mp4)

• Anomalie #4227 (En cours) : Indication de l’extension d’une sauvegarde

  16 novembre 2018, par Franck D

  Hello :-)
  Un SPIP 3.3.0-dev [24147] tout neuf sans plug,
  Prefix des tables "test1" installation en MySQL
  En php 7.2 chez ovh
  Environement : stable
  Moteur : phpcgi
  Mode développement

  Quand je vais sur ecrire/ ?exec=restaurer, il y a le texte "Ou indiquez le nom du fichier à restaurer" !
  Je ne sais pas s’il s’agit d’une "anomalie", d’une évolution, ou d’un problème de texte et donc de "documentation" :-(
  Mais pour que cela fonctionne, il faut obligatoirement faire l’ajout en plus du nom ; de l’extension du fichier !

  Sans quoi, cela ne fonctionne pas, et c’est même perturbant, car le message d’erreur est "Ce nom de fichier n’est pas autorisé" !
  A voir s’il est possible de faire, une restauration en autre chose que sqlite, car dans si ce n’est pas le cas, il ne devrait servir à rien de devoir écrire l’extension