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• How much the duration of an mp3 file given by Ffprobe is precise ?

  24 septembre 2024, par Julien Larget-Piet

  I have an mp3 file at a sample rate value of 44100, let's name it a.mp3.

  


  So i get the duration of a.mp3 with the following ffprobe command :

  


  ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 a.mp3

  


  I get 7.752 seconds.

  


  Because the sample rate is per second, in theory the total amount of samples should be,

  


  44100 * 7.752 = 341863.2

  


  Let's round it to 341863

  


  But using python library ffmpegio with the following code, i get a total amount of sample equal to 340560.

  


  with ffmpegio.open(file, 'ra', blocksize = 16, sample_fmt = 'dbl') as file_opened:

        for i, indata in enumerate(file_opened):

            do some stuff
    print(i * 16)


  


  So there is a non-negligible difference between 341863 and 340560.

  


  I think it comes from the duration value given by Ffmpeg.
What do you thin ?

  


  I search in ffmpegio documentation, but found nothing that trigered my attention :

  


  https://python-ffmpegio.github.io/python-ffmpegio/

  


  Thanks.

  


  Search for answers about the precision of the ffprobe command.

  


• ffmpeg remote url not working in lambda function

  9 septembre 2024, par Komal

  I have created lambda function to trim video.

  


  I run this command :

  


  /opt/bin/ffmpeg -protocol_whitelist file,http,https,tcp,tls -i 'https://source-bucket.s3.amazonaws.com/1.mp4' -ss 5 -t 10 -loglevel 48 -y -avoid_negative_ts 1 -acodec copy /tmp/output.mp4


  


  It gives following output :

  


  "ffmpeg version 7.0.2-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2024 the FFmpeg developers\n  built with gcc 8 (Debian 8.3.0-6)\n  configuration: --enable-gpl --enable-version3
--enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-libgme --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg\n  libavutil      59.  8.100 / 59.  8.100\n  libavcodec     61.  3.100 / 61.  3.100\n  libavformat    61.  1.100 / 61.  1.100\n  libavdevice    61.  1.100 /
61.  1.100\n  libavfilter    10.  1.100 / 10.  1.100\n  libswscale      8.  1.100 /  8.  1.100\n  libswresample   5.  1.100 /  5.  1.100\n  libpostproc    58.  1.100 / 58.  1.100\nSplitting the commandline.\nReading option '-protocol_whitelist' ... matched as AVOption 'protocol_whitelist' with argument 'file,http,https,tcp,tls'.\nReading option '-i' ... matched as input url with argument 'https://source-bucket.s3.amazonaws.com/1.mp4'.\nReading option '-ss' ... matched as option 'ss' (start transcoding at specified time) with argument '50'.\nReading option '-t' ... matched as option 't' (stop transcoding after specified duration) with argument '100'.\nReading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument '48'.\nReading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.\nReading option '-avoid_negative_ts' ... matched as AVOption 'avoid_negative_ts' with argument '1'.\nReading option '-acodec' ... matched as option 'acodec' (alias for -c:a (select encoder/decoder for audio streams)) with argument 'copy'.\nReading option '/tmp/output.mp4' ... matched as output url.\nFinished splitting the commandline.\nParsing a group of options: global .\nApplying option loglevel (set logging level) with argument 48.\nApplying option y (overwrite output files) with argument
1.\nSuccessfully parsed a group of options.\nParsing a group of options: input url https://source-bucket.s3.amazonaws.com/1.mp4.\nSuccessfully parsed a group of options.\nOpening an input file: https://source-bucket.s3.amazonaws.com/1.mp4.\n[AVFormatContext @ 0x70ea0c0] Opening 'https://source-bucket.s3.amazonaws.com/1.mp4' for reading\n"


  


  So, its not going beyond this : 'Opening 'https://source-bucket.s3.amazonaws.com/1.mp4' ; for reading\n'

  


  And after this, it immediately gets out. Need suggestions, where its going wrong. Same command working fine on local computer.

  


  I tried cloudfront and signed url as well, as mentioned in this post : How to read remote video on Amazon S3 using ffmpeg. But it doesnt work with url. Only working when downloaded into tmp folder.

  


  Following is the final log, which you can see is no timeout. It actually finish function execution within 2-3 seconds. I have timeout set for 15 mins to the function which is maximum :


  


  REPORT RequestId: 4acd7b38-017c-4dce-bb65-8f6fd3cf37e0  Duration: 1297.93 ms    Billed Duration: 1298 ms    Memory Size: 1024 MB    Max Memory Used: 103 MB Init Duration: 328.76 ms    


  


• python [WinError 2] the System Cannot Find the File Specified

  15 août 2024, par user26831166

  Code cant create a certain file
The thing is code isn't mine a took it from a friend and my friend get it from another person
and this 2 person can run code without any problem
but i have.

  


  import os
import random
import shutil
import subprocess

# Путь к папке с видео
video_folder = r'D:\bots\ttvidads\VID\Videorez'

# Путь к папке для сохранения результатов
output_folder = r'D:\bots\ttvidads\VID\ZAGOTOVKI\Videopod1'

# Очищаем содержимое конечной папки перед сохранением
for file in os.listdir(output_folder):
    file_path = os.path.join(output_folder, file)
    try:
        if os.path.isfile(file_path):
            os.unlink(file_path)
    except Exception as e:
        print(f"Failed to delete {file_path}. Reason: {e}")

# Получаем список видеофайлов
video_files = [os.path.join(video_folder, file) for file in os.listdir(video_folder) if file.endswith(('.mp4', '.avi'))]

# Выбираем случайное видео
random_video = random.choice(video_files)

# Получаем длительность видео в секундах
video_duration_command = f'ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "{random_video}"'
video_duration_process = subprocess.Popen(video_duration_command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
video_duration_output, _ = video_duration_process.communicate()
video_duration = float(video_duration_output)

# Выбираем случайное начальное время для вырезания
random_start = random.randrange(0, int(video_duration) - 19, 8)

# Получаем ширину и высоту исходного видео
video_info_command = f'ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 "{random_video}"'
video_info_process = subprocess.Popen(video_info_command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
video_info_output, _ = video_info_process.communicate()
video_width, video_height = map(int, video_info_output.strip().split(b'x'))

# Вычисляем новые координаты x1 и x2 для обрезки
max_x1 = video_width - int(video_height * 9 / 16)
random_x1 = random.randint(0, max_x1)
random_x2 = random_x1 + int(video_height * 9 / 16)

# Формируем команду для FFmpeg для выборки случайного отрезка видео с соотношением 9:16
ffmpeg_command = f'ffmpeg -hwaccel cuda -ss {random_start} -i "{random_video}" -t 19 -vf "crop={random_x2-random_x1}:{video_height}:{random_x1}:0" -c:v h264_nvenc -preset default -an -c:a aac -b:a 128k "{output_folder}\\temp.mp4"'

# Выполняем команду с помощью subprocess
subprocess.run(ffmpeg_command, shell=True)

# Изменяем яркость, контрастность и размываем видео
brightness_factor = random.uniform(-0.18, -0.12)  # Случайный коэффициент яркости
contrast_factor = random.uniform(0.95, 1.05)  # Случайный коэффициент контрастности
blur_factor = random.uniform(4, 5)  # Случайный коэффициент размытия

# Формируем команду для FFmpeg для изменения яркости, контрастности и размытия видео
ffmpeg_modify_command = f'ffmpeg -hwaccel cuda -i "{output_folder}\\temp.mp4" -vf "eq=brightness={brightness_factor}:contrast={contrast_factor},boxblur={blur_factor}:{blur_factor}" -c:v h264_nvenc -preset default -an -c:a aac -b:a 128k "{output_folder}\\temp_modify.mp4"'

# Выполняем команду с помощью subprocess
subprocess.run(ffmpeg_modify_command, shell=True)

# Растягиваем видео до нужного разрешения (1080x1920)
ffmpeg_stretch_command = f'ffmpeg -hwaccel cuda -i "{output_folder}\\temp_modify.mp4" -vf "scale=1080:1920" -c:v h264_nvenc -preset default -an -c:a aac -b:a 128k -r 30 "{output_folder}\\final_output.mp4"'

# Выполняем команду с помощью subprocess
subprocess.run(ffmpeg_stretch_command, shell=True)

# Удаляем временные файлы
os.remove(os.path.join(output_folder, 'temp.mp4'))
os.remove(os.path.join(output_folder, 'temp_modify.mp4'))

print("Видеофайл успешно обработан и сохранен.")


  


  Error i got after run the code

  


  = RESTART: D:\Bots\2vidpod.py&#xA;Traceback (most recent call last):&#xA;  File "D:\Bots\2vidpod.py", line 71, in <module>&#xA;    os.remove(os.path.join(output_folder, &#x27;temp.mp4&#x27;))&#xA;FileNotFoundError: [WinError 2] Не удается найти указанный файл: &#x27;D:\\bots\\ttvidads\\VID\\ZAGOTOVKI\\Videopod1\\temp.mp4&#x27;&#xA;</module>

  


  so things i checked is
path is right
programs is installed FFMPEG and PYTHON all additional libraries downloaded
i pretty sure error caused by regular path and i wanna know if absolute path can do the thing