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Sur d’autres sites (7838)

  • Run a function from while read line

    2 octobre 2013, par user2783132

    I'm trying to run a function from while read line, the function contains ffmpeg commands to marge two files. but for some reason it's running the first $line and than breaks from loop.

    "$filesList" contains three lines. I'm not sure what's wrong, but i can confirm with echo "$OFILE" that opener function runs three times if I comment out the ffmpeg commands, and only once with ffmpeg commands.

    opener(){
    
        OFILE="$1"
    
        echo "$OFILE"
    

    
        ffmpeg -i $opener_path -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
    
        ffmpeg -i $OFILE -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
    
        ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc merge_$OFILE
    

    
        mv merge_$OFILE $OFILE
    
        rm intermediate1.ts intermediate2.ts
    
}
    

    

    
while read line; do
    
        if [ -e "$line" ]; then
    
                opener "$line"
    
        fi
    
done <<< "$filesList"

  • Tailing a logfile and processing each line is missing data when converting a file with ffmpeg

    8 avril 2014, par Chris.D

    I am running a script to tail a log file as per the code snippet below. I am running into a problem where by the line passed into $line is missing a number amount of bytes from the beginning when several lines are written to the log file at nearly the same time.

    I can check the file afterwards and see that the offending line is complete in the file so why is it incomplete in the script. Some kind of buffering issue perhaps ?

    The processing can sometimes take several seconds to complete would that make a difference ?

    #!/bin/bash
    
tail -F /var/log/mylog.log | while read line
    
do
    
   log "$line"
    
   ffmpeg -i "from.wav" "to.mp3"
    
done

    Full line in file

    "12","","765467657","56753763","test"

    example logged $line

    657","56753763","test"

    Update
    I have done some more debugging of my code and it seems the processing that is causing the problem is a call to ffmpeg used to convert a wav to mp3. If I swap that with just a sleep then the problem goes away. Could ffmpeg effect the buffer somehow ?

  • Tailing a logfile and processing each line is missing data when converting a file with ffmpeg

    1er août 2018, par Chris.D

    I am running a script to tail a log file as per the code snippet below. I am running into a problem where by the line passed into $line is missing a number amount of bytes from the beginning when several lines are written to the log file at nearly the same time.

    I can check the file afterwards and see that the offending line is complete in the file so why is it incomplete in the script. Some kind of buffering issue perhaps ?

    The processing can sometimes take several seconds to complete would that make a difference ?

    #!/bin/bash
    
tail -F /var/log/mylog.log | while read line
    
do
    
   log "$line"
    
   ffmpeg -i "from.wav" "to.mp3"
    
done

    Full line in file

    "12","","765467657","56753763","test"

    example logged $line

    657","56753763","test"

    Update
    I have done some more debugging of my code and it seems the processing that is causing the problem is a call to ffmpeg used to convert a wav to mp3. If I swap that with just a sleep then the problem goes away. Could ffmpeg effect the buffer somehow ?

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