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• While loop in bash to read a file skips first 2 characters of THIRD Line

  9 juillet 2018, par Yaser Sakkaf

  #bin/bash
  
  INPUT_DIR="$1"
  
  INPUT_VIDEO="$2"
  
  OUTPUT_PATH="$3"
  
  SOURCE="$4"
  
  DATE="$5"
  
  
  
  INPUT="$INPUT_DIR/sorted_result.txt"
  
  COUNT=1
  
  initial=00:00:00
  
  while IFS= read -r line; do
  
    OUT_DIR=$OUTPUT_PATH/$COUNT
  
    mkdir "$OUT_DIR"
  
    ffmpeg -nostdin -i $INPUT_VIDEO -vcodec h264 -vf fps=25 -ss $initial -to $line $OUT_DIR/$COUNT.avi
  
    ffmpeg -i $OUT_DIR/$COUNT.avi -acodec pcm_s16le -ar 16000 -ac 1 $OUT_DIR/$COUNT.wav
  
    python3.6 /home/Video_Audio_Chunks_1.py $OUT_DIR/$COUNT.wav
  
    python /home/transcribe.py  --decoder beam --cuda --source $SOURCE --date $DATE --video $OUT_DIR/$COUNT.avi --out_dir "$OUT_DIR"
  
    COUNT=$((COUNT + 1))
  
    echo "--------------------------------------------------"
  
    echo $initial
  
    echo $line
  
    echo "--------------------------------------------------"
  
    initial=$line
  
  done < "$INPUT"

  This is the code I am working on.
  The contents of file sorted_results.txt are as follows :

  00:6:59
  
  00:7:55
  
  00:8:39
  
  00:19:17
  
  00:27:48
  
  00:43:27

  While reading the file it skips first two characters of the third line i.e. it takes it as :8:39 which results in the ffmpeg error and the script stops.

  However when I only print the variables $INITIAL and $LINE, commenting the ffmpeg command the values are printed correctly i.e. same as the file contents.

  I think the ffmpeg command is somehow affecting the file reading process or the variable value. BUT I CAN’T UNDERSTAND HOW ?

  PLEASE HELP.

• How to pass command line arguments to FFMpeg in iOS

  23 septembre 2014, par Arif Nadeem

  This is a beginner question, since I am new to iOS(I started it today), so please pardon my ignorance and lack of iOS knowledge.

  After building and successfully using FFMpeg for Android I wanted to do the same for iOS.
  So I built FFMpeg successfully for iOS by following this link, but after all that pain I am confused as how to use FFMpeg in iOS, I mean how can I pass command line arguments to libffmpeg.a file ?

  I am assuming that there must be a way to run the .a file as an executable and then pass command line arguments and hope for FFMpeg to do the magic, I did the same in Android and it worked beautifully.

  I am also aware that I can use ffmpeg.c class and use its main method, but the question remains ; how do I pass those command line arguments ?

  Is there something I am supposed to be aware of here, is the thing what I am doing now correct or am I falling short on my approach ?

  I wanted to mix two audio files, so the command for doing that would be ffmpeg -i firstSound.wav -i secondSound.wav -filter_complex amix=inputs=2:duration=longest finalOutput.wav, how do I do the same in iOS ?

  Can someone please shed some light on this ?

• Suggestion query : Someone should add 'percent-complete' to ffmpeg's status line

  19 février 2018, par Dave

  I use the PC-platform’s ffmpeg (on Windows and Linux). I’ve always
  wondered why, down on that bottom dynamic status line, it does NOT
  show a ’percent-complete’ value.

  e.g. There’s already a line showing what time-line value is being worked
  on, so I’d expect it would be straight-forward to grab total duration, compute percent-complete, and show it, right after the running time value. Or,
  if based on frames, then show it in parentheses after the frame value.

  The reason I think it would be straight-forward is because I see it
  discussed in detail, for ffmpeg on Android, here :
  How to add progress bar to FFMPEG android
  and it talks about time-values and frame-count based calculations.

  Any volunteers to tackle this ? ^ ;)