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• Why are there multiple .m3u8 requests made by the browser ?

  20 mai 2020, par 47fa0c

  I usually download my lectures instead of watching them on the online player provided by my university. I do this by finding requests that include .m3u8 in their url. There always seems to be two of these for each of the videos that I want to download, with one slight difference in the urls but otherwise identical. Why is that the case ?

  



  My wild guess is that one of them is supposed act as a backup if the other failed to fetch but I am not sure.

  



  I can't share the urls as they contain copyrighted material but it looks something like

  



  domain/a/b/hashedvalue1/c/video.mp4/index.m3u8


  



  and

  



  domain/a/b/hashedvalue2/c/video.mp4/index.m3u8


  



  Thanks for your help :)

  


• Encode photos into (some) video format in Android

  17 juillet 2014, par user2011769

  In my app I need to convert photos (taken by the user) into some playable (on both Android device and pc web browser) vide format.

  My first and obvious choice was GIF, I’ve managed to get it working using this https://github.com/nbadal/android-gif-encoder but the result was of very poor quality. What I didn’t now was gif is a terrible standard - only 256 colors per frame, virtually no compression, so for my purposes it’s useless.

  I know it is possible to use ffmpeg for this, but I have no experience with NDK (and I’ve used C only at the university).

  Are there any other options worth exploring ?

  EDIT : it needs to work on ICS (minSdkVersion=15)

• Why do I get UnknownValueError() speech_recognition.UnknownValueError when trying to run .recognize_google ?

  20 juillet 2022, par John Smith

  Following code is meant to transcribe a long audio file to text. It is to do this piece by piece. trimmed.wav holds a 15-second-long piece of a longer audio file (whose path is stored in fname) :

  


  #!/usr/bin/env python3

from subprocess import run
from sys import exit

italic = '\33[3m'
end = '\33[m'

try:
    from speech_recognition import AudioFile, Recognizer
except:
    run("pip3 install SpeechRecognition", shell=True)
    from speech_recognition import AudioFile, Recognizer

def transcribe_piece(fname, lang, stime):
    extension = fname[-3:]
    etime = stime + 15
    cmd = f"ffmpeg -ss {stime} -to {etime} -i {fname} -c copy trimmed.{extension} >/dev/null 2>&1"
    run(cmd, shell=True)
    cmd = f"ffmpeg -i trimmed.{extension} -f wav trimmed.wav >/dev/null 2>&1"
    run(cmd, shell=True)
    r = Recognizer()    
    af = AudioFile("trimmed.wav")
    with af as source:
        r.adjust_for_ambient_noise(source)
        audio = r.record(source)
        t = r.recognize_google(audio, language=lang)#UnknownValueError() speech_recognition.UnknownValueError
        print(f"{italic}{t}{end}")
        with open("of", "w") as f:
            f.write(f"{t}\n")
    run(f"rm trimmed.{extension}", shell=True) 
    run(f"rm trimmed.wav", shell=True)
    
    

fname = input("File name? Skip the path if the file is in CWD. The usage of ~ is allowed.\n")

lang = input("""Specify one of the following languages:
fr-BE, fr-CA, fr-FR, fr-CH

en-AU, en-CA, en-GH, en-HK, en-IN, en-IE, en-KE, en-NZ, en-PK, en-PH, en-SG, en-ZA, en-TZ, en-GB, en-US

es-AR, es-BO, es-BO, es-CL, es-CO, es-CR, es-DO, es-EC, es-SV, es-SV, es-GT, es-HN, es-MX, es-NI, es-PA, es-PY, es-PE, es-PR, es-ES, es-US, es-UY, es-VE\n""")


#for stime in range(0, 10000, 15):
#    try:
#        transcribe_piece(fname, lang, stime)
#    except:
#        run("shred -u trimmed.wav" , shell=True) 
        #run("shred -u trimmed.wav >/dev/null 2>&1" , shell=True) 
#        exit(0)
        
for stime in range(0, 10000, 15):#this loop is only for the sake of debugging, use try/except above
    transcribe_piece(fname, lang, stime)



  


  It gives me the following error :

  


  Traceback (most recent call last):&#xA;  File "/home/jim/CS/SoftwareDevelopment/MySoftware/Python/speech-to-text/long-audio-to-text.py", line 61, in <module>&#xA;    transcribe_piece(fname, lang, stime)&#xA;  File "/home/jim/CS/SoftwareDevelopment/MySoftware/Python/speech-to-text/long-audio-to-text.py", line 31, in transcribe_piece&#xA;    t = r.recognize_google(audio, language=lang)&#xA;  File "/home/jim/.local/lib/python3.10/site-packages/speech_recognition/__init__.py", line 858, in recognize_google&#xA;    if not isinstance(actual_result, dict) or len(actual_result.get("alternative", [])) == 0: raise UnknownValueError()&#xA;speech_recognition.UnknownValueError&#xA;&#xA;</module>

  


  The said error refers to line 31, that is t = r.recognize_google(audio, language=lang).
Why do I get this error ? How might I rewrite this code so that such error does not appear ?