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• ffprobe filter videos by duration, command prints but does not return duration

  22 juillet 2021, par jcu

  I am attempting to use ffprobe to filter through videos by their duration. I was using :

  


  vid_length = subprocess.call(f"ffprobe -i {local_vids_2[count]} -show_entries format=duration -v quiet -of csv='p=0'", shell = True)
print("VIDEO LENGTH IS:", vid_length, "FOR: ", count)


  


  While I DO get the duration printed to my command prompt by the shell command, I noticed I DON'T get it returned as a variable like I need. Instead it's returning 0, so I get something like : VIDEO URL IS: 100_scaled.mp4 FOR:  0 11.883000 VIDEO LENGTH IS: 0 FOR:  0 and VIDEO URL IS: 101_scaled.mp4 FOR:  1 56.171000 VIDEO LENGTH IS: 0 FOR:  1 etc.

  


  I have also tried vid_length = subprocess.call(f"ffprobe -i {local_vids_2[count]} -show_entries format=duration -v quiet -of csv=%s % ('p=0')", shell = True) based on what I read in this post but that hasn't worked either.

  


  Is there a way I can get this command to return anything ? Or do I need something else that will return the video length for coding purposes ? Thank You.

  


• Python subprocess or os.system not working with ffmpeg

  13 février 2024, par confused

  I've been trying to get this darn programming run since last night and cannot seem to get anything to work. I want to first trim the video and then resize the video. I'm reading which video and what to give the final name from a text file, over 780 lines long, quite a few videos.

  


  Thus far with every idea under the sun I have tried, subprocess and os.system, I can't get anything more than error statements or right now all I get is no file creation of any kind. How the heck do I get this to work correctly ?

  


  import ffmpeg
import subprocess
import os

os.chdir('/home/Downloads/SRs/')
a = open('SRt.txt', 'r')
b = a.readlines()
a.close()
for c in range(0, len(b)-1):
    words = list(b[c].split(" "))
    d = len(words)
    e = words[d-1]
    f = b[c].replace(e, 'FR' + str(c) + '.mp4')
    words[d-1] = 'FR' + str(c) + '.mp4'
    print(f)
    subprocess.call(f, shell=True)
    subprocess.call([
        'ffmpeg',
        '-i',
        "'FR' + str(c) + '.mp4'",
        '-vf scale=320:240',
        words[d-1],
        ])


  


  Here are some examples of what the original file would look like :

  


   ffmpeg -i SR.mp4 -ss 00:00:00 -to 00:01:22 -c:v copy -a copy CPH.mp4
 ffmpeg -i SR.mp4 -ss 00:01:24 -to 00:02:58 -c:v copy -a copy CG.mp4
 ffmpeg -i SR.mp4 -ss 00:02:59 -to 00:05:41 -c:v copy -a copy CSGP.mp4


  


  Nothing fancy just separating video in its own individual segments and then resaving it before resizing it.

  


  I tried :

  


  z=subprocess.call(f, shell=True, stdout=subprocess.PIPE)
print(z)


  


  But all I get is '1'.

  


  When I changed it to :

  


  z=subprocess.call(f, shell=True, stderr=subprocess.PIPE)
print(z)


  


  All I get is '1'.

  


  Maybe I'm doing something wrong.

  


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

  21 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 ?