Recherche avancée

Sur d’autres sites (5650)

• What is faster, Raw PCM audio files, or mp3 files decoded with FFmpeg ?

  8 janvier 2020, par Matthew Strom

  I’m pretty deep into the development of my Android app, and as I mess around with my audio files a second time to try longer audio clips (1000ms long), I am now getting audio glitches again. Before I was not getting any glitches with 160ms long files.

  • Background : I’m making a metronome, so imagine roughly 100 lines of code in the callback to constantly figure out what audio file to play and for how long.

  Without getting into my code, I was just wondering if file size or file type has any impact on performance ? I believe I’m using the sample Player rendering class (source) (for Raw file input) which seems to load the audio data of the file each callback. This would Perhaps loading data from a larger array would slow it down ? Although, It could also be the new features/logic that I’m adding to the callback.

  I know it is talked about frequently about using mp3’s and decoding with FFmpeg. Has anyone done any bench-marking between mp3 and raw, and is there any performance advantage to using mp3’s, or is it mainly to cut down on your APK size ?

  Sorry if this has been discussed somewhere, however, I wasn’t able to find any articles mentioning this aspect between the two file types. Looking more closely at the rendering class, my gut tells me that file size "shouldn’t" be a factor... Otherwise I’ll continue to debug and maybe get some systraces in if I can.

• exec() with SuPHP and SafeMode Off (php.ini local) show wrong path and fail execution

  29 juillet 2013, par abkrim

  Try this

  <?php
  
       if (exec('/usr/bin/ffmpeg -i 47.mp4 -acodec aac -ab 128kb -vcodec mpeg4 -b 1220kb -mbd 1 -s 320x180 final_video.mov"'))
  
           { echo "Success"; }
  
       else { echo "No good"; }
  
  ?>

  But on shell see—>

  sh: /usr/local/php/bin/ffmpeg: No such file or directory

  Server it's Apache+SuPHP with a local php.ini file for disable SafeMode

  I don't understand why show sh : /usr/local/php/bin/ffmpeg : No such file or directory instead real path put on php script.

• how to generate multiple bitrate output hls files from live rtsp stream

  10 février 2015, par prashanta

  I am gerating single bitrate live hls content from live rtsp stream . I am using the following command

  ffmpeg -v verbose -i rtsp://127.0.0.1:8080/test.sdp -vcodec libx264 -acodec aac -ac 1 -strict -2 -crf 18 -profile:v baseline -maxrate 400k -bufsize 1835k -pix_fmt yuv420p -flags -global_header -hls_time 10 -hls_list_size 3 -hls_wrap 4 -hls_flags delete_segments -start_number 1 /usr/local/apache-tomcat-7.0.53/webapps/ROOT/hls/index1.m3u8

  How can I modify the above FFmpeg command to generate multiple bitrate output content ? Please help me.