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• get audio current freqency for each 0.1 second of audio file with ffmpeg sox or opus into file.txt

  15 mars 2019, par Vlad

  I am trying to get audio freqency statistic from call record in file.opus for each 0,1 second, have try ffmpeg (spectrum) ffprobe ,
  for example
  sox  '.$file.' −n rate 6k spectrogram −z 62 -w Hamming -o aaaaaa/test10.png stat -freq 2>aaaaaa/test10.txt
  return spectrum
  all of them return values but no freqency found any other library ? Or what I am doing wrong I now it retrun spectrum but I need concrete freqency of human voice it is possible with ffmpeg or ffprobe or sox ? I am working in php but running shel comands any help will be aprisiatied. What should be my next step ? I am lost I have no idea how could get freqency from this numbers or "it is possible " ??? What is the first step comand in sox etc.

• converting .mov file to .h264 file

  29 août 2011, par Robin Rye

  ok, this is the case, i actually want to parse frames from a mov file. get the encoded h264 frames. and i've managed to do so by using ffmpeg but when i try to make a movie again by using ffmpeg -i test* test.mov i get test00: Invalid data found when processing input so there is something not correct with the structure of the frames. as i understand it a frame should have the following appearance :

  00 00 00 01 XX data -------------

  where XX is say whether it is a I-,P- or B-frame. or more specifically type(XX) = 0x0F && XX says if it is I(type(XX) = 5 ?),P(type(XX) = 7 ?) or B(type(XX) = 8 ?) frame. I'm not sure about these number, i've been looking for it but not found good sources. so that's question number one, what number should the NALU be for the different frames ?

  anyway, when i use av_read_frame on the mov file, i get frame that look like this :

  4B = size, 1B = XX and then data. (at least this is what i think i get)

  the files where i store the frames are always size long when i look at them in a hexeditor(otherwise as well of course). and XX is always 65(ie. type(XX) = 5) in the first and then 61(ie. type(XX) = 1) for a couple of frames and then back to being 65 for one frame and so on.

  i guess that these are frames like : I P P P P P P I P P P P P P P I P P P P P P P .... however then my assumption about the type numbers for the different frame types are false, which is highly likely. (any suggestion on reading about this ? except the ISO/IEC 14496-10, i don't understand it really).

  I've tried to remove the size and append 00 00 00 01 before the XX byte and the data but without success. any tips on how i could modify the frames to be valid H264 encoded frames ?

• Audio file could not be read as PCM WAV, AIFF/AIFF-C, or Native FLAC ; check if file is corrupted or in another format

  4 mai 2024, par 陳昱廷

  import os
import speech_recognition as sr

command = "ffmpeg -i videototext.mp4 videototext.mp3"
os.system(command)

commandwav = "ffmpeg -i videototext.mp3 videototext.wav"
os.system(commandwav)

AUDIO_FILE = "videototext.wav"

r = sr.Recognizer()
videototext = sr.AudioFile(AUDIO_FILE)

with videototext as source:
   audio = r.record(source, duration=100)

print(type(audio))
print(r.recognize_google(audio))


  


  ---

  


  above is my code,then the error is : Audio file could not be read as PCM WAV, AIFF/AIFF-C, or Native FLAC ; check if file is corrupted or in another format.