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• ffmpeg from .mp3 to .al appears to slow and deepen the audio

  6 juillet 2020, par Darpeh

  I have an mp3 input file that is 22050Hz and 48kb/s. I need to convert it to a .al file in order to stream it to a camera on my network for output.

  


  ffmpeg -i file.mp3 file.al 


  


  creates a file that does play but the bitrate of the output is 176kb/s and it clearly slower/deeper sounding. I have tried -b:a 48k and -filter:a without success but I could be doing it wrong.

  


  Documentation states that this is the format I need : PCM ADPCM G.711A G.711.Mu G.726 G.729 MPEG2 AMR AAC

  


• How to save last 30 seconds of video in py

  5 juin 2024, par Mateus Coelho

  I want the last 30 seconds to be recorded every time I click enter and sent to the cloud. for example, if I click at 00:10:30, I want a video that records from 00:10:00 to 00:10:30 and if I click in sequence at 00:10:32, I need another different video that in its content is recorded from 00:10:02 to 00:10:32.

  


  I think I have a problem where I will always end up recovering from the same buffer in the last 30 seconds. Is there any approach so that whenever I click enter I retrieve a unique video ? Is my current approach the best for the problem ? Or should I use something else ?

  


  import subprocess
import os
import keyboard
from datetime import datetime
from google.cloud import storage

# Configuration
STATE = "mg"
CITY = "belohorizonte"
COURT = "duna"
RTSP_URL = "rtsp://Apertai:130355va@192.168.0.2/stream1"
BUCKET_NAME = "apertai-cloud"
CREDENTIALS_PATH = "C:/Users/Abidu/ApertAI/key.json"

def start_buffer_stream():
    # Command for continuous buffer that overwrites itself every 30 seconds
    buffer_command = [
        'ffmpeg',
        '-i', RTSP_URL,
        '-map', '0',
        '-c', 'copy',
        '-f', 'segment',
        '-segment_time', '30',  # Duration of each segment
        '-segment_wrap', '2',  # Number of segments to wrap around
        '-reset_timestamps', '1',  # Reset timestamps at the start of each segment
        'buffer-%03d.ts'  # Save segments with a numbering pattern
    ]
    return subprocess.Popen(buffer_command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

def save_last_30_seconds_from_buffer(buffer_file):
    datetime_now = datetime.now()
    datetime_now_formatted = f"{datetime_now.day:02}{datetime_now.month:02}{datetime_now.year}-{datetime_now.hour:02}{datetime_now.minute:02}"
    output_file_name = os.path.abspath(f"{STATE}-{CITY}-{COURT}-{datetime_now_formatted}.mp4")

    # Copy the most recent buffer segment to the output file
    save_command = [
        'ffmpeg',
        '-i', buffer_file,
        '-c', 'copy',
        output_file_name
    ]
    subprocess.run(save_command, check=True)
    print(f"Saved last 30 seconds: {output_file_name}")
    return output_file_name

def upload_to_google_cloud(file_name):
    client = storage.Client.from_service_account_json(CREDENTIALS_PATH)
    bucket = client.bucket(BUCKET_NAME)
    blob = bucket.blob(os.path.basename(file_name).replace("-", "/"))
    blob.upload_from_filename(file_name, content_type='application/octet-stream')
    print(f"Uploaded {file_name} to {BUCKET_NAME}")
    os.remove(file_name)  # Clean up the local file

def main():
    print("Starting continuous buffer for RTSP stream...")
    start_time = datetime.now()
    buffer_process = start_buffer_stream()
    print("Press 'Enter' to save the last 30 seconds of video...")

    while True:
        # Verify if 30 seconds has passed since start
        if keyboard.is_pressed('enter'):
            print("Saving last 30 seconds of video...")
            elapsed_time = (datetime.now() - start_time).total_seconds()
            # Determine which buffer segment to save
            if elapsed_time % 60 < 30:
                buffer_file = 'buffer-000.ts'
            else:
                buffer_file = 'buffer-001.ts'
            final_video = save_last_30_seconds_from_buffer(buffer_file)
            upload_to_google_cloud(final_video)

if _name_ == "_main_":
    main()




  


• How to pass custom parameters when creating docker swarm service ?

  31 mai 2022, par Mike

  I am new to docker and docker swarm and started dockerizing several services and am trying to get them running as docker swarm services. I ran into a road block with the linuxserver/ffmpeg image :

  


  

  1. it uses a —device parameter which is not implemented in create service

  


  2. it expects several custom parameters to pass them to the ffmpeg encoder

  


  


  From my research up to now I assume that passing parameters is not implemented in docker create service, but maybe you can think of a workaround ? (unfortunately the image does not process environment variables, or at least they are not documented)

  


  This is how I start dockerized ffmpeg (working fine in standalone mode) :

  


  docker run -d /
  
—network="host" /
  
—device=/dev/video0 :/dev/video0 / ### error : unknow flag
  
—name ffmpeg_streamer /
  
—restart always -it /
  
-v $(pwd)/video :/video /
  
linuxserver/ffmpeg / ### custom parameters below here
  
-stream_loop /
  
-1 -re -nostdin /
  
-i "/video/test.avi" /
  
-f pulse /
  
-vcodec libx264 /
  
-preset:v veryfast /
  
-b:v 400k /
  
-f flv rtmp ://localhost:1935/live/streamkey

  


  Many thanks for looking into this !