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Sur d’autres sites (7403)

  • 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 ?

  • BASH deletes the first letter from line (ffmpeg) [duplicate]

    21 mars 2020, par LubieCiastka

    Input :

    # cat list
    
video1.mp4
    
video2.mp4
    
video3.mp4
    
video4.mp4

    My script :

    #!/bin/bash
    

    
while IFS= read -r line || [[ -n "$line" ]]; do
    
  echo $line
    
  ffmpeg -i $line -c copy -bsf:v h264_mp4toannexb -f mpegts $line.ts
    
  echo $line
    

    
done < "./list";
    

    
rm *.ts

    Every second iterations, bash reads "ideo2.mp4" instead of "video2.mp4" or "ideo4.mp4" instead of "video4.mp4"

    FULL output

    + IFS=
    
+ read -r line
    
+ echo video1.mp4
    
video1.mp4
    
+ ffmpeg -i video1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts video1.mp4.ts
    
...
    
+ echo video1.mp4
    
video1.mp4
    
+ IFS=
    
+ read -r line
    
+ echo ideo2.mp4
    
ideo2.mp4
    
+ ffmpeg -i ideo2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts ideo2.mp4.ts
    
...
    
ideo2.mp4: No such file or directory
    
+ echo ideo2.mp4
    
ideo2.mp4
    
+ IFS=
    
+ read -r line
    
+ echo video3.mp4
    
video3.mp4
    
+ ffmpeg -i video3.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts video3.mp4.ts
    
...
    
+ echo video3.mp4
    
video3.mp4
    
+ IFS=
    
+ read -r line
    
+ echo ideo4.mp4
    
ideo4.mp4
    
+ ffmpeg -i ideo4.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts ideo4.mp4.ts
    
...
    
ideo4.mp4: No such file or directory
    
+ echo ideo4.mp4
    
ideo4.mp4

    When I comment line "ffmpg..." everything works fine.
    Testing on local Ubuntu (bash 4.4.20(1)-release) and on VPS (debian) (bash 4.4.12(1))
    What is going on ?

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