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• png_parser : Fix parsing on big endian

  18 décembre 2013, par Martin Storsjö

  png_parser : Fix parsing on big endian
  Since pc.state is populated by shifting in from the end of the
  
  32 bit word, the content within pc.state is already in native endian
  
  and should not be read with the AV_RL,B functions.
  This was already done correctly for state64 above.
  This fixes the fate-corepng test on big endian.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavcodec/png_parser.c

• Adding mp3 metadata with space in ffmpeg using bash [duplicate]

  15 septembre 2019, par ctrlnot

  This question already has an answer here :

  • When to wrap quotes around a shell variable ?
    
    5 answers
    

  I have this bash script on downloading youtube videos then convert it to mp3 using youtube-dl and ffmpeg.

  #!/bin/bash
  
  
  
  ytlink=""
  
  outputFileName=""
  
  title=""
  
  artist=""
  
  album=""
  
  
  
  while getopts l:o:t:r:b: flag; do
  
    case "${flag}" in
  
      l) ytlink="${OPTARG}";;
  
      o) outputFileName="${OPTARG}";;
  
      t) title="${OPTARG}";;
  
      r) artist="${OPTARG}";;
  
      b) album="${OPTARG}";;
  
    esac
  
  done
  
  
  
  youtube-dl "$ytlink" --add-metadata --extract-audio --audio-format mp3 --output "temp.%(ext)s"
  
  
  
  tempFilename="temp.mp3"
  
  outputFileName="$outputFileName.mp3"
  
  
  
  args+=("-i" "$tempFilename" "-metadata" "title='$title'" "-metadata" "artist='$artist'" "-metadata" "album='$album'" "-metadata" "comment=Source:$ytlink")
  
  ffmpeg -loglevel debug ${args[@]} -acodec copy "$outputFileName"
  
  rm "$tempFilename"

  This script is fine if I have one word title/artist/album. However, if I have a space, ffmpeg interprets each word before space as another parameter. This is how I use this on command line :

  ./yttomp3.sh -l "https://www.youtube.com/watch?v=KwQnSHAilOQ" -o "Lee - Autumn Day" -t "Autumn Day" -r "Lee" -b "(Free) Lo-fi Type Beat - Autumn Day"

  The debug output of ffmpeg :

  Splitting the commandline.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  Reading option '-i' ... matched as input url with argument 'temp.mp3'.
  
  Reading option '-metadata' ... matched as option 'metadata' (add metadata) with argument 'title='Autumn'.
  
  Reading option 'Day'' ... matched as output url.
  
  Reading option '-metadata' ... matched as option 'metadata' (add metadata) with argument 'artist='Lee''.
  
  Reading option '-metadata' ... matched as option 'metadata' (add metadata) with argument 'album='(Free)'.
  
  Reading option 'Lo-fi' ... matched as output url.
  
  Reading option 'Type' ... matched as output url.
  
  Reading option 'Beat' ... matched as output url.
  
  Reading option '-' ... matched as output url.
  
  Reading option 'Autumn' ... matched as output url.
  
  Reading option 'Day'' ... matched as output url.
  
  Reading option '-metadata' ... matched as option 'metadata' (add metadata) with argument 'comment=Source:https://www.youtube.com/watch?v=KwQnSHAilOQ'.
  
  Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'copy'.
  
  Reading option 'Lee - Autumn Day.mp3' ... matched as output url.
  
  Finished splitting the commandline.

  I tried enclosing the arguments to quotes on the script but it’s still not working. How should I deal with this ? Thanks.

• How to use ffmpeg with h.265 (or h.264) codec ?

  6 octobre 2022, par randomuser1

  Normally I start recording the camera image with the command :

  



  ffmpeg -y -f vfwcap -r 25 -i 0 OUT.mp4

  



  but I'm not sure which coded do I use in here (I'm just beginning my adventure with ffmpeg), however I found on this webpage this command :

  



  ffmpeg -i INPUT -c:a copy -x265-params crf=25 OUT.mov

  



  But when I run it - I get the following error :
INPUT: No such file or directory"

  



  I changed the INPUT word above also to 0, so the command is

  



  ffmpeg -i 0 -c:a copy -x265-params crf=25 OUT.mov,
but error stays similar (0: no such file or directory).
How can I grab the camera image and save it to a file while using the H.265 ?