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• C - FFmpeg streaming from a C program ?

  8 août 2016, par golmschenk

  I’m looking to replicate an FFmpeg command-line command in my C code. Specifically I would like to be able to run :

  ffmpeg -re -i video.mp4 -f mpegts udp://localhost:7777

  One thing I’ve noticed when looking at people’s code who have used the libraries of FFmpeg in their own code is that they often have a few hundred lines of code for a single command similar to an FFmpeg command-line command. I’m guessing this is just because they are doing something very specific, because if I can run that short command on my command line and get what I want it should probably only take about ten lines of code to do the same thing in my C code. This should only take about that much work right ? Why would it take much more ?

  I’m having a bit of difficulty finding explanations on how to use the streaming capabilities of the FFmpeg libraries that aren’t overly complex because they’re for a very specific purpose. Can anyone explain how I might go about writing the code for the above command ? Or at the very least point me to some documentation explaining how to write such a script/program ? Thank you much !

  EDIT : I do hope to run this from an iPhone app eventually so I won’t just be able to straight up call FFmpeg from my program. I’ll need to use the libraries used by FFmpeg.

• convert lower bitrate mp3 to higher bit rate [closed]

  6 mars 2016, par janeman

  i had 2000 songs in 128 kbps but in my server space was not there so i have compressed those mp3 to 16kbps and found ok quality on my pc but when i was listening those songs on my iphone i found that sound quality is not good so now i wan t to convert those 16kbps songs to 48kbps which i think will give good sound quality so that users cant differentiate that songs are compressed and it will load fast as well .here is the ffmpeg code i have used to convert 16kbps file to 48kbps . i can see that the size of converted file has increased approx 3 fold but not sure whether it will give the better quality mp3 when i increase the bit rate through conversion .please suggest any way to get my file back with good mp3 quality

    <?php  
  
   if ( exec('ffmpeg  -i /pathtomp3folder/test.mp3  -acodec libmp3lame  -ab 48k -ac 1 -ar 44100  /pathtomp3folder/oputput.mp3'))
  
  
  
     {
  
    echo 'done!!';
  
    }
  
  
  
    ?>

  i can do below code as well wthout specifying the frequency which is best way to do

     ffmpeg  -i /pathtomp3folder/test.mp3  -acodec libmp3lame  -ab 48k -ac 1   /pathtomp3folder/oputput.mp3
  
  
  
    {
  
    echo 'done!!';
  
     }

  i dont see much difference in 16kbps and converted file quality however size got increased 3 times in converted file

  what is the minimum kbps we should prefer so that users cant detect the difference and i get high streaming rate as well without buffering .i am targetting mobile device so please suggest about mobile device

  size of 16 kbps file was 745kb and size of 48kbps file is 1840kb

  where i am doing mistake any idea or if anyone can share his experinene it will be a great help .i have stuggled to get my collection of 2000 songs back as i dont have backup and in my pc the quality of mp3 seems to be ok but when i play in iphone it clearly shows that its of low quality

  in my server ffmpeg is installed and working properly so it is easily converting the bit rate .one more thing i want to know when the bit rate is getting changed from 16kbps to 48 kbps what is the changes in quality ???/ as i can clearly see that size is increasing but the quality remains same

• ffmpeg configure for ios - using asm options causes MPx (mp1, mp2, mp3) codecs sound problems

  18 avril 2013, par hard gamer

  I've made many tests to get good performance for video decoding with ffmpeg on low cpu idevices such as iPad 1 and iPhone 3Gs, and see that using asm option when configuring ffmpeg for cross compiling for ios is very very important for performance..

  But when I configure with —enable-asm, the audio stream which using mpx(mp1,mp2,mp) codec sounds squeaky.
  If I configure with —disable-asm option, than mpx(mp1,mp2,mp) codec sounds well but then the performance is %50 percent of the previous one built with the —enable-asm option...

  I've also tested these with the ffmpeg versions that are 0.8, 0.9, 0.10, 0.11, 1.0,1.1,1.2
  All of them produces same results...

  Can anyone have the same problem with me ? Also, any idea how can I fix this issue ? please advice me .. (I can not find any patch to fix this issue on the net or in ffmpeg forums.)

  -MS