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• avformat/aaxdec : Check string before strcmp()

  23 octobre 2020, par Michael Niedermayer

  avformat/aaxdec : Check string before strcmp()
  Fixes : NULL ptr dereference
  
  Fixes : 26508/clusterfuzz-testcase-minimized-ffmpeg_dem_AAX_fuzzer-5694725249826816
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/aaxdec.c

• Revert "avutil/timecode : fix sscanf format string with garbage at the end"

  16 janvier 2021, par Marton Balint

  Revert "avutil/timecode : fix sscanf format string with garbage at the end"
  This reverts commit 6696a07ac62bfec49dd488510a719367918b9f7a.
  It is wrong to restrict timecodes to always contain leading zeros or for hours
  
  or frames to be 2 chars only.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavutil/timecode.c

• Filtering string for hidden character when read from file in bash [duplicate]

  19 mai 2021, par BharathYes

  I am writing a bash script to trim video file into small pieces and finally merge them into a single video file using ffmpeg based on specified time.

  


  #!/bin/bash

filename="$1"
linecount=`wc -l "${filename}.txt"`
echo -n "" > to-merge.list

# file split by time
count=0
IFS=''
while read -r fromTime ; read -r toTime; do
    echo "$fromTime and $toTime done"
    ffmpeg -i "${filename}.mp4" -ss $fromTime -to $toTime -c copy "${filename}_pt_${count}.mp4"
    echo "file '${filename}_pt_${count}.mp4'" >> to-merge.list
    count=$((count+1))
done < "${filename}.txt"

# file merge
`ffmpeg -f concat -safe 0 -i to-merge.list -c copy "${filename}-trimmed.mp4"`


  


  The input file contains time (odd lines are taken as start time and even as the end time). A file I use is :

  


  00:00:00
00:39:34
00:39:38
01:23:14
01:23:16
02:03:45
02:03:48
02:43:43


  


  ---

  


  problem faced

  


  The echo in while loop prints this : done02:03:45

  


  The overwriting makes me think the time stored in the variables must contain a special character at the end that makes it invalid in ffmpeg.
ffmpeg throws this error : Invalid duration specification for ss: 01:23:16

  


  Is there a way to cleanup the time variable ?

  


  I have tried to find what is causing this issue or how to get rid of it but drawing a blank.

  


  ---

  


  what I have tried so far

  


  use grep -Eo '[0-9]{1,2}:[0-9]{1,2}:[0-9]{1,2}' to find time. While this works on the shell I am unable to use it in the script.

  


  Tried splitting time by : into hour, min and sec and saving them into an array to then merge them back but this makes it unnecessarily complicated and error prone.

  


  PS :
Is while read to be preferred for reading multiple lines like here or should tools like sed be used for best practice ? Such as sed '2,4 !d' /tmp/test.txt ?