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• How can combine two separate scripts being piped together to make one script instead of two ?

  27 mars 2016, par user556068

  For the past couple hours I’ve been banging my head against the wall trying to figure out something I thought would be simple. Maybe it is but it’s beyond me at the moment. So I have now two scripts. Originallly they were part of the same but I could never make it work how it should. So the first part uses curl to download a file from a site. Then using grep and sedto filter out the text I need which is then put into a plain text file as a long list of website urls ; one per line. The last part of the 1st script calls on youtube -dl to read the batch file in order to obtain the web addresses where the actual content is located. I hope that makes sense.

  youtube-dl reads the batch file and outputs a new list urls into the terminal. This second list is not saved to file because it doesn’t need to be. These urls change from day to day or hour to hour. Using the read command, these urls are then passed to ffmpeg using a predetermined set of arguments for the input and output. Ffmpeg is executed on every url it receives and runs quietly in the background.

  The first paragraph describes script1.sh and paragraph 2 obviously describes script2.sh. When I pipe them together like script1.sh | script2.sh it works better than I ever thought possible. Maybe i’m nitpicking at this point but the idea is to have 1 unified script. For the moment I have simplified it by adding an alias to my .bash_profile.

  Here are the last two commands of script1.

  sed 's/\"\,/\//g' > "$HOME/file2.txt";
  
  cat $HOME/file2.txt | youtube-dl --ignore-config -iga -

  The trailing - allows youtube-dl to read from stdin.

  The second part of the script ; what I’m calling script2 at this point begins with

  while read -r input
  
  do
  
  ffmpeg [arg] [input] [arg2] [output]

  What am i not seeing that is causing the script to hang when the two halves are combined yet work perfectly if one is piped into the other ?

• aac encoding with ffmpeg result in super short file

  5 janvier 2017, par Mockarutan

  So I’m having problem with AAC encoding. I’m trying to encode some synthetic sound waves, but it does not work as expected. The file I get gives just a super short sound when played in VLC. When I play is in ffplay is plays like I expect, but it says "duration : 00:00:00.05" which I suppose says 5 ms. But I encode a lot more than that, and it played more. So VLC plays a super short sound, ffplay plays a longer file (the expected length), but displays it with super short duration, what’s going on ?

  Source : http://pastebin.com/M5MKkEL3

  One of the things that looks wrong to me is this :
  If you look for the variable "audio_time", if you breakpoint it and read it every encode frame, you will get this :

  ..
  Encode frame 8 : 0.00010416666666666666
  Encode frame 9 : 0.00012500000000000000
  (and so on)

  The diff is : 0.00002085, which is a 1/1000 of a the diff I expected from 47 samples frames per second, which is what the encoder wants with 48k sample rate (48k / 1024 = 47).

  So why do I get a thousand of the expected data encoded ?

  Feel free to point anything suspicious out !

  Thanks in advance !

• difference between using SDL and using media player class that is videoview

  21 janvier 2014, par Whoami

  I have been surfing the net for some time to get basic understanding of media framework in android. As part of this,

  To display video we have media player class or video view component which can easily display the video. When we have such solution provided by the framework itself, then why there are few components avaiable like SDL [ Simple Direct Media Layer], which claims the same functionality as video view.?

  How both are different ?

  Kindly bare with me, if the question is very basic.