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• How do I install ffmpeg on one EC2 Amazon Linux instance that can stream a mp4 ? [closed]

  12 septembre 2020, par starpebble

  Good day. How can I install ffmpeg on an EC2 amazon linux machine that can stream a mp4 ?

  


  The goal : an ffmpeg install on EC2 Amazon Linux that can stream one mp4 to one rtmps endpoint. Then, create an integration test suite with it.

  


  Is it just me or is ffmpeg a little crippled on EC2 Amazon Linux ?

  


  Example :

  


  ffmpeg -re -i input.mp4 -c:v libx264 -b:v 6000K -maxrate 6000K -pix_fmt yuv420p -s 1920x1080 -profile:v main -preset veryfast -g 120 -x264opts "nal-hrd=cbr:no-scenecut” -acodec aac -ab 160k -ar 44100 -f flv rtmps:///app/


  


  Linux OS :

  


  Linux version 4.14.193-113.317.amzn1.x86_64 (mockbuild@koji-pdx-corp-builder-60005) (gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC)) #1 SMP Thu Sep 3 19:08:08 UTC 2020


  


  The stackoverflow answer to similar questions fail to install a ffmpeg that can stream.

  


  An installation script such as Install FFMPEG Library on EC2 Server fail this year.

  


  The static downloads referenced on John Van Sickle-FFmpeg Static Builds fail to stream to IVS. I tried the i686 release, my first guess for an x86_64 instance.

  


  The git source tree compiled binary fails to stream. Example : The tip of the tree isn't what I expected because the binary fails to recognize switches like -preset.

  


  I'd love to be able to explain streaming to anyone. Thanks.

  


• End Part of .WAV file is not converted to .MP3 file

  29 janvier 2021, par Shailendra Patil

  

  


  As you can see the in the above image, the end part of the .wav file is not represented in the mp3 file. Here, I am making use of avcodec_decode_audio4() api to decode each packet, and using lame_encode_buffer() api to encode it in mp3 format. Here, I am seeing this issue for MONO streams( 1.wav -> 1.mp3 ). I just wanted to know why is this occuring, even when I am providing all the .wav file content. I am suspecting there is some caching that is happening, due to which I am unable to get whole data into the mp3 file. Any help here would be appreciated.

  


• pydub returning zero byte file when I try to export part of an Mp3

  25 janvier 2023, par tom f

  I'm sharing this for posterity, since I already figured out the answer. I'm trying to create preview snippets of MP3 files with pydub in Python, but when I ran the export the files were always zero bytes in size.

  



  example :

  



  from pydub import AudioSegment    

sound = AudioSegment.from_mp3("preview_temp/n/1/mp3/01_Beyond_and_Into_the_Ultimate.mp3")

# len() and slicing are in milliseconds
halfway_point = len(sound) / 2

second_half = sound[halfway_point:]
print second_half
second_half.export("preview_temp/n/1/prev/prev_test.mp3", format="mp3", bitrate="192k")


  



  I verified the source file existed and was accessible. My inkling was this had something to do with ffmpeg. It was installed properly, but then I came across this on the pydub github :

  



  


  You may use libav or ffmpeg. libav is recommended.

  


  



  The pydub developer runs through installation on several platforms on the github wiki. I'm sharing it here to make it easier for folks to find, though.