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• perturbation of an audio/video decoding execution trace with gstreamer

  9 mars 2013, par KKc

  I am a new comer in gstreamer community and i have a pipeline to decode and trace a .mp4 file.

  gst-launch --gst debug=filesrc:7,queue:7,audioconvert:7,audioresample:7,qtdemux:7,faad:7,ffmpeg:7,audioresample:7,audioconvert:7,autoaudiosink:7,autovideosink:7,  filesrc location=...! qtdemux name=demuxer demuxer. ! queue ! faad ! audioconvert ! audioresample ! autoaudiosink demuxer. ! queue ! ffdec_h264 ! ffmpegcolorspace ! autovideosink > file1

  I inserted the "identity" component to disturb the decoding, and effectively, i saw images which became very slow and sound disappeared.
  I used this command :

  gst-launch --gst debug=filesrc:7,queue:7,audioconvert:7,audioresample:7,qtdemux:7,faad:7,ffmpeg:7,audioresample:7,audioconvert:7,autoaudiosink:7,autovideosink:7,  filesrc location=...! qtdemux name=demuxer demuxer. ! queue ! faad ! audioconvert ! audioresample ! autoaudiosink demuxer. ! queue ! identity sleep-time=1000000 ! ffdec_h264 ! ffmpegcolorspace ! autovideosink > file2

  The first time i did this execution, two new functions appeared in file2,

  (i) gst_ffmpegdec_chain...'skipping...',

  (ii) gst_ffmpegdec_video_frame...'Dropping..'

  I assumed that the meaning is that some data were dropped or something else

  However, since many days, i use the same pipelines, with the same video to decode ; i obtain the same bad visualization, but any new function in file 2 :(
  the only difference is the number of occurrence of the functions below :

  *gst_ffmpegdec_update_qos :...'update* 558 times in one case

  *gst_ffmpegdec_update_qos :...'update* 4 times in the other case

  I don't know why i am unable to produce again a disturbed trace with 'skipping..' and 'dropping..'

  My questions are :

  1- have you any idea about the meaning of the above functions ?

  2- Do you know any other component useful to disturb a A/V decoding processing ?

  Thank you for any reply

• mov : Export geotag metadata fields

  3 juin 2014, par Martin Storsjö

  mov : Export geotag metadata fields
  The ’ ?xyz’ form is used by android devices (and according to apple
  
  mailing list archives, also by older iOS devices). The ’loci’ field
  
  (defined in 3GPP 26.244) is used by recent iOS devices.
  Even though the loci field can contain an altitude, it was plain
  
  0 in my sample. Just export longitude and latitude, in a string
  
  format matching the one used by the ’ ?xyz’ metadata field.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/mov.c

• FFmpeg conversion to mp3 works in terminal, not in script

  19 juillet 2013, par user2598172

  I can run

  ffmpeg -i test.m4a -vn -acodec libmp3lame -ab 256k test.mp3

  And it works perfectly. However, when I have the line :

  ./ffmpeg -i "$SONG_SAVE.m4a" -vn -acodec libmp3lame -ab 256k "$SONG_SAVE$EXT" &> /dev/null

  running in a .sh script (downloading the same file that I was able to successfully convert through the terminal), it returns an mp3 file with no audio data. Does anyone have any idea what could be causing this ? Thanks !

  EDIT : here is the whole script :

   #!/bin/bash
  
  
  
  TITLE="$(echo "$1" | ./recode html..ascii | tr -d '\' | tr -s ' ' | sed 's|\ *$||')"
  
  TAG_TITLE="$2"
  
  ARTIST="$(echo "$3" | ./recode html..ascii | tr -d '\' | tr -s ' ')"
  
  ALBUM="$(echo "$4" | ./recode html..ascii | tr -d '\' | tr -s ' ')"
  
  IMG="$5"
  
  TRACK_NUMBER="$6"
  
  TOTAL_TRACKS="$7"
  
  URL="$8"
  
  MIX_TITLE="$9"
  
  CONVERT="${10}"
  
  RECURSIVE="${11}"
  
  SESSION_ID="${12}"
  
  DOWNLOAD_ID="${13}"
  
  SONG_ID="${14}"
  
  
  
  SONG_SAVE="songs/$SONG_ID"
  
  ZIP_SAVE="$SESSION_ID-$DOWNLOAD_ID.zip"
  
  ZIP_DIR="$MIX_TITLE/"
  
  ARTWORK_SAVE="artwork/$MIX_TITLE.png"
  
  SAVE_TITLE="$(echo "$TITLE" | sed 's|/|-|g;s|^\.||g')"
  
  
  
  [ "$TAG_TITLE" == "false" ] && unset TITLE
  
  [ "$ARTIST" == "false" ] && unset ARTIST
  
  [ "$ALBUM" == "false" ] && unset ALBUM
  
  [ "$IMG" == "false" ] && unset IMG
  
  [ "$TRACK_NUMBER" == "false" ] && unset TRACK_NUMBER TOTAL_TRACKS
  
  [ "$CONVERT" == "false" ] && unset CONVERT
  
  [ "$RECURSIVE" == "false" ] && unset RECURSIVE
  
  
  
  while [ -f "SONG_SAVE".part ]; do
  
      sleep 2
  
  done
  
  
  
  if [ -f "$SONG_SAVE".m4a ]; then
  
      EXT=".m4a"
  
      touch "$SONG_SAVE$EXT"
  
  elif [ -f "$SONG_SAVE".mp3 ]; then
  
      EXT=".mp3"
  
      touch "$SONG_SAVE$EXT"
  
  else
  
      curl -Lso "$SONG_SAVE".part "$URL"
  
  
  
      if [ -n "$(file -b "$SONG_SAVE".part | grep "MPEG ADTS")" ]; then
  
          EXT=".mp3"
  
      elif [ -n "$(file -b "$SONG_SAVE".part | grep "MPEG v4")" ]; then
  
      EXT=".m4a"
  
  else
  
      EXT=".txt"
  
      echo "Unable to download: $URL. Sorry ):" > "$SONG_SAVE".part
  
  fi
  
  
  
  mv "$SONG_SAVE".part "$SONG_SAVE$EXT"
  
  fi
  
  
  
  if [ -n "$CONVERT" ] && [ "$EXT" == ".m4a" ]; then
  
  EXT=".mp3"
  
  if [ ! -f "$SONG_SAVE$EXT" ]; then
  
      ./ffmpeg -i "$SONG_SAVE.m4a" -vn -acodec libmp3lame -ab 256k "$SONG_SAVE$EXT"         &> /dev/null
  
      fi
  
  fi
  
  
  
  if [ "$EXT" == ".mp3" ]; then
  
      ./eyeD3 --remove-images -t "$TITLE" -a "$ARTIST" -A "$ALBUM" -n "$TRACK_NUMBER" -N     "$TOTAL_TRACKS" "$SONG_SAVE$EXT" &> /dev/null
  
      if [ -n "$IMG" ]; then
  
      [ ! -f "$ARTWORK_SAVE" ] && curl -Lso "$ARTWORK_SAVE" "$IMG"
  
          ./eyeD3 --add-image="$ARTWORK_SAVE":FRONT_COVER "$SONG_SAVE$EXT" &> /dev/null
  
      fi
  
  elif [ "$EXT" == ".m4a" ]; then
  
  if [ -n "$IMG" ]; then
  
      [ ! -f "$ARTWORK_SAVE" ] && curl -Lso "$ARTWORK_SAVE" "$IMG"
  
      if [ -n "$TRACK_NUMBER" ]; then
  
          ./mp4tags -P "$ARTWORK_SAVE" -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" -t "$TRACK_NUMBER" -T "$TOTAL_TRACKS" "$SONG_SAVE$EXT" &> /dev/null
  
      else
  
          ./mp4tags -P "$ARTWORK_SAVE" -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" "$SONG_SAVE$EXT" &> /dev/null
  
      fi
  
  else
  
      if [ -n "$TRACK_NUMBER" ]; then
  
          ./mp4tags -r P -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" -t "$TRACK_NUMBER" -T "$TOTAL_TRACKS" "$SONG_SAVE$EXT" &> /dev/null
  
      else
  
          ./mp4tags -r P -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" "$SONG_SAVE$EXT" &> /dev/null
  
          fi
  
      fi
  
  fi
  
  
  
  if [ -n "$RECURSIVE" ]; then
  
      cd archives
  
      mkdir -p "$ZIP_DIR"
  
      chmod 777 "$ZIP_DIR"
  
      cp "../$SONG_SAVE$EXT" "$ZIP_DIR$SAVE_TITLE$EXT"
  
      ./zip -q -0 -D -r "$ZIP_DIR$ZIP_SAVE" "$ZIP_DIR$SAVE_TITLE$EXT" &> /dev/null
  
      rm -f "$ZIP_DIR$SAVE_TITLE$EXT"
  
      printf "archives/$ZIP_DIR$ZIP_SAVE\n$MIX_TITLE.zip\n$EXT\n"
  
      echo "$(du -h "$ZIP_DIR$ZIP_SAVE" | tr '\t' '\n' | head -1)"
  
  else
  
      printf "$SONG_SAVE$EXT\n$SAVE_TITLE$EXT\n$EXT"
  
  fi