Recherche avancée

Sur d’autres sites (5889)

• libavformat/segment.c : Add strftime expansion for segment filename templates

  28 décembre 2014, par Pedro E. M. Brito

  libavformat/segment.c : Add strftime expansion for segment filename templates
  Allows expansion of the filename template with strftime() with the option
  
   strftime 1 (disabled by default). This allows segments to be named by time of
  
  creation, adding some flexibility.
  Fixes Ticket 4104 (add strftime to segment muxer)
  Signed-off-by : Pedro E. M. Brito <pedroembrito@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/segment.c

• Switching between multiple m3u8 playlist

  25 janvier 2018, par formatkaka

  In a live stream setup, I have 2 cameras and each one sends RTMP stream to one different application which is on my Nginx-RTMP server. On the browser I am using Videojs Hls plugin.

  Now my question is how can I load these two streams one after another in the same hlsplayer player instance. For example, I want to load the first 15 seconds in my first source and the next 15 seconds from my second source in the same player. Since the .ts files are named incrementally and if I have 5sec chunks of .ts files in each .m3u8 file, I want to load the first 3 .ts files to be loaded from the first source(.m3u8 file) and the next 3 from another source(.m3u8 file). How can I achieve that ?

  Can I generate some kind of master M3U8 file which has the list of these other .M3U8 files or can I develop a plugin in videojs to load the appropriate ts files directly ?

  source1.m3u8
  1.ts
  2.ts
  3.ts

  source2.m3u8
  1.ts
  2.ts
  3.ts

  I want to load 1.ts from source1.m3u8 and 2.ts from source2.m3u8 but with no delay or lag.

• FFmpeg save .mp3 output into a variable

  6 mai 2021, par Toto Briac

  In my application I want to modify various mp3 and then mix them together. I know I could do it with a single command line in FFmpeg but It can end up very messy since I need to use various filter on each sample and I have five of them.
My idea is to edit each sample individually, save them into a variable and finally mix them. This is my code :

  


  import subprocess    

def create_samp():
    sample= subprocess.run(["ffmpeg", "-y", "-i", "https://freesound.org/data/previews/186/186942_2594536-hq.mp3", \
                           "-filter_complex", "adelay=15000|15000", "-codec:v", "copy", "-f", "mp3","-"], stdout=subprocess.PIPE)         
    return(sample)    

def record(samp):
    subprocess.run(["ffmpeg", "-y", "-i", "https://cdns-preview-b.dzcdn.net/stream/c-b0b684fe962f93dc43f1f7ea493683a1-3.mp3", \
                    "-i", samp.stdout, "-f", "-mp3", "copy", "output.mp3"])

samp = create_samp()
record(samp)


  


  My issue is that I have to encode the stdout. I've tried 'utf-8' but got this error :

  


  UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 45: invalid start byte


  


  With `'utf-16' :

  


  UnicodeDecodeError: 'utf-16-le' codec can't decode bytes in position 239454-239455: illegal encoding


  


  Why is the way to fix this issue ? Is my approach the right one ?

  


  Thanks to @Rotem I succeed to do what I wanted to. But now I am facing an other issue, since I want to mix up to 5 sounds, I tried to implement it the lazy/easy way :

  


  import subprocess

def create_samp_2():
    sample= subprocess.run(["ffmpeg", "-i", "https://freesound.org/data/previews/186/186942_2594536-hq.mp3", \
                            "-af", "adelay=15000|15000", "-f", "mp3", "pipe:"], stdout=subprocess.PIPE).stdout
    return(sample)

def create_samp():

    sample= subprocess.run(["ffmpeg", "-i", "https://freesound.org/data/previews/370/370934_6399962-lq.ogg", \
                            "-af", "adelay=1000|1000", "-f", "mp3", "pipe:"], stdout=subprocess.PIPE).stdout
    return(sample)


def record(samp, samp_2):        
    process = subprocess.Popen(["ffmpeg", "-y", '-f', 'mp3', \
                                "-i", "https://cdns-preview-b.dzcdn.net/stream/c-b0b684fe962f93dc43f1f7ea493683a1-3.mp3", \
                                "-i", "pipe:", \
                                "-i", "pipe:", \
                                "-filter_complex", "amix=inputs=3:duration=longest", "output.mp3"], stdin=subprocess.PIPE)

    process.stdin.write(samp) 
    process.stdin.write(samp_2)        
    process.stdin.close()  
    process.wait()

samp = create_samp()
samp_2 = create_samp_2()
record(samp, samp_2)


  


  Surprisingly it works, my two sounds start at the right time, but the second sound is messed up. So it's not the right way to do it.

  


  Then I tried named pipes as suggested this way :

  


  "pipe1:"


  


  But I get this error :

  


  pipe1:: Protocol not found
Did you mean file:pipe1:?


  


  Reading named pipe wiki it is stated that I have to create them with mkfifo().

  


  So I tried :

  


  import os
pipe1 = "pipe1"

def create_pipe1():
    os.mkfifo(pipe1)

But now I have this error: pipe1:: Protocol not found
Did you mean file:pipe1:?