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• Convert 2 channel mp4 to each mono wav file using FFMPEG or Python code

  30 mai 2024, par Harish Alwala

  I am new to audio files and its codecs.

  


  I would like to convert a 2 channel mp4 file to a single mono wav files.

  


  My understanding is a when I say 2 channel, it stores speech coming from each microphone in a separate channel. And when I split the channels to each individual mono wav files, I get speech of each microphone.

  


  My intension here is to get the speech from each channel and convert them to text. This way I can set the name of the speaker based on channel.

  


  I tried with ffmpeg and python code as well, unfortunately I get two files with same content.

  


  Looking at the following details
can someone construct ffmpeg command or python script to convert the 2 channel mp4 file to 2 individual mono wav files.

  


  FFprobe
ffprobe -i Two-Channel.mp4 -show_streams -select_streams a

  


  Result

  


  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Google
  Duration: 00:52:42.19, start: 0.000000, bitrate: 421 kb/s
  Stream #0:0[0x1](und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 640x360 [SAR 1:1 DAR 16:9], 322 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
      Metadata:
        handler_name    : ISO Media file produced by Google Inc.
        vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s (default)
      Metadata:
        handler_name    : ISO Media file produced by Google Inc.
        vendor_id       : [0][0][0][0]
[STREAM]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=44100
channels=2
channel_layout=stereo
bits_per_sample=0
initial_padding=0
id=0x2
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/44100
start_pts=0
start_time=0.000000
duration_ts=139452416
duration=3162.186304
bit_rate=96000
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=136184
nb_read_frames=N/A
nb_read_packets=N/A
extradata_size=16
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
DISPOSITION:non_diegetic=0
DISPOSITION:captions=0
DISPOSITION:descriptions=0
DISPOSITION:metadata=0
DISPOSITION:dependent=0
DISPOSITION:still_image=0
TAG:language=eng
TAG:handler_name=ISO Media file produced by Google Inc.
TAG:vendor_id=[0][0][0][0]
[/STREAM] 


  


  FFmpeg command

  


  ffmpeg -i Two-Channel.mp4 -filter_complex "pan=mono|c0=0c0" left_channel.wav

  


  python code
using FFPMEG I converted mp4 to wav and then tried below code



  


• Unable to find a suitable output format for 'is' is : Invalid argument in fmmpeg

  26 janvier 2023, par Test000

  I want to make a python script to make a video in FFmpeg. I try a lot of solutions for example but I do not know Why I do not have permission to write. I have not any idea because ffmpeg errors are a little bit tricky

  


  my code :

  


  import os
import cv2

def calculate_quote_position(quote, max_length, video_width, video_height):
    if len(quote) > max_length:
        print("Quote is too long for the video.")
        return
    
    # Determine font size and alignment
    font = cv2.FONT_HERSHEY_SIMPLEX
    font_scale = 1.0
    thickness = 2
    (text_width, text_height), _ = cv2.getTextSize(quote, font, font_scale, thickness)
    
    # Calculate position for the quote
    x = int((video_width - text_width) / 2)
    y = int((video_height + text_height) / 2)
    
    return (x, y, text_width, text_height)

def create_video_from_audio_quote_picture(music_file, quote, font, font_size, font_color, background_picture, output_file, video_duration, video_width, video_height, max_length):
    quote_position = calculate_quote_position(quote, max_length, video_width, video_height)
    if not quote_position:
        print("The quote is too long for the video.")
        return
    # Create the FFmpeg command
    command = f"ffmpeg -loop 1 -t {video_duration} -i {background_picture} -i {music_file} -vf drawtext='fontfile={font}':text={quote}:fontcolor={font_color}:fontsize={font_size}:x={quote_position[0]}:y={quote_position[1]}' -shortest -c:v libx264 -c:a aac {output_file}"

    # Execute the command
    os.system(command)

music_file = "music.mp3"
quote = "This is a quote"
font = "Raleway-Bold.ttf"
font_size = 20
font_color = "white"
background_picture = "nature.png"
output_file = r"C:\Users\Lukas\Dokumenty\python_scripts\Billionare livestyle\output.mp4"
video_duration = 30
video_width = 1920
video_height = 1080
max_length = 30

create_video_from_audio_quote_picture(music_file, quote, font, font_size, font_color, background_picture, output_file, video_duration, video_width, video_height, max_length)


  


  my error :

  


  Input #0, image2, from 'nature.png':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 569438 kb/s
  Stream #0:0: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 72:72 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #1, mp3, from 'music.mp3':
  Metadata:
    date            : 2020:12:15 01:00:00
    title           : Otnicka - Peaky Blinder (lyrics) | i am not outsider i'm a peaky blinder
    artist          : Jigzaw
    encoder         : Lavf58.29.100
  Duration: 00:02:31.78, start: 0.023021, bitrate: 128 kb/s
  Stream #1:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavf
  Stream #1:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 320x240 [SAR 1:1 DAR 4:3], 90k tbr, 90k tbn, 90k tbc (attached pic)
    Metadata:
      comment         : Other
[NULL @ 000001575c0b0100] Unable to find a suitable output format for 'is'
is: Invalid argument


  


• Live stream failed on Youtube

  20 septembre 2023, par kuldeep chopra

  We are currently running an AWS container that utilizes FFmpeg for live streaming while concurrently saving the stream as an MP4 file. However, we encountered an issue during a recent live stream session that was functioning correctly until approximately 13 minutes in, at which point FFmpeg reported the following error logs :

  


  ffmpeg [flv @ 0x555c4bdfe680] Failed to update header with correct duration.
2023-09-07T23:06:38.490+05:30 [flv @ 0x555c4bdfe680] Failed to update header with correct filesize.
2023-09-07T23:06:38.491+05:30 failed => rtmp://a.rtmp.youtube.com/live2/key......
2023-09-07T23:06:38.491+05:30 ffmpeg [tee @ 0x555c48843700] Slave muxer #1 failed: Broken pipe, continuing with 1/2 slaves.


  


  It's worth noting that we have conducted hundreds of live streams on YouTube without encountering this error before ; this is the first occurrence of such an issue.

  


  We would greatly appreciate it if you could investigate and provide insights into the underlying problem causing these error messages.