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• Insert Random silence multiple times between Audios in ffmpeg

  23 septembre 2021, par Gracie williams

  suppose I have MP3 of around 1 minute duration and increase its duration longer.Duration can be any.

  


  I want to randomly add N seconds of silence to that audio.

  


  I can generate the silence like below

  


  ffmpeg -f lavfi -i anullsrc=r=44100:cl=mono -t <seconds> -q:a 9 -acodec libmp3lame out.mp3&#xA;</seconds>

  


  And I can insert silence to audio like below

  


  ffmpeg -i in.wav -filter_complex "anullsrc,atrim=0:4[s];[0]atrim=0:14[a];[0]atrim=14,asetpts=N/SR/TB[b];[a][s][b]concat=3:v=0:a=1" out.wav


  


  Is there anyway to insert silence at multiple areas.With php I can generate random time to insert based on 60 seconds audio like below.

  


  $arr = [];
$arr[3] = 2; //here 3 is original audio insert time and 2 is the duration of silence
$arr[6] = 3;  //here 6 is original audio insert time and 3 is the duration of silence
$arr[10] = 1;
$arr[12] = 3;


  


  Now I want to insert silence between seconds based on above array like

  


  2 seconds silence at 3rd second
3 seconds silence at 6th second
1 second silence at 10th second


  


  and son on..

  


• for loop seems to runs several times [closed]

  19 juillet 2021, par Dentricky73

  I am (trying) to write a script that read the ip's from the file 'data.dat'.
Check if the ip have the statuscode 200, if yes write the ip to the text file 'OK_IP.LIST.txt', next dump the image from the rtsp stream to directory images.

  


  My intention is to verify that the count from the ip's in data.dat is equal to OK_IP.LIST.txt ;
if not, delete data.dat and rename OK_IP.LIST.txt to data.dat and loop again.

  


  Later the script should be looping until the user presses a key (but that's for the future).

  


  The problem now is, when I start with 10 ip's in the data.list and write the good ip's (status code 200) to OK_IP.LIST.txt there are 20 ip's. (Let's say they all works.)

  


       data.dat       >      OK_IP.LIST.txt
1111.1111.1111.1111    1111.1111.1111.1111
2222.2222.2222.2222    2222.2222.2222.2222
3333.3333.3333.3333    3333.3333.3333.3333
                       1111.1111.1111.1111
                       2222.2222.2222.2222
                       3333.3333.3333.3333


  


  Something is wrong in the loop ; the list is written twice to OK_IP.LIST.txt.
I'm doing something wrong, but I can't find it.

  


  #!/bin/bash

mkdir images >/dev/null 2>&1   #dev null don't display "dir already exist"
IPS="$(< data.dat)"            #read the file data to var IPS

 ok200=0
 counter=0
 Totalips="$(wc -l "data.dat")"
 
 echo 'starting...' 
 
 for IP in $IPS;                # loop through the items 
  do    
        TRY1="$(curl -m 2 -s -o /dev/null --head -w "%{http_code}" -X POST "rtsp://$IP:554")"          # ask Status code from curl
        if [ "$TRY1" -eq 200 ]                                                                 # is statuscode 200
        then
                    ok200=`expr $ok200 + 1`                         
            FFM="$(ffmpeg -y -nostdin -stimeout 8000000 -rtsp_transport tcp -ss 0.5  -i "rtsp://$IP:554/12" -vframes 1 -s 640x480 -f image2 images/$IP.jpg  >/dev/null 2>&1)"
                                                    #echo $FFM
            echo $IP &>> OK_IP.LIST.txt
                                            
        fi              
        clear
        counter=`expr $counter + 1`;
        echo  'IP done ' $counter 'from' $Totalips| sed 's/data.dat//g' 
        echo 'now testing' $IP
        echo 'Good ips'  $ok200
        #sleep 1 #don't help 
done


  


  I know it's nooby written, I can check if the dir images exist - if yes, do nothing, else mkdir and so on.
That's all planned for later.

  


• Revision fa57135b2c : Merge "Removing NUM_ prefix from constant names."

  22 octobre 2013, par Dmitry Kovalev

  Changed Paths :
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_onyxc_int.h

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_block.h

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Merge "Removing NUM_ prefix from constant names."