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• 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()




  


• FFMpegCore .Net cuts off the fist few ( 1.5) seconds of audio

  28 mai 2024, par Tim

  I want to use FFMpegCore to convert some audio files to raw pcm. I noticed that this always cuts off 1.5 seconds of my audio from the start. I check my input stream, saved it to HD all good. If use it from cli with the same arguments everything seem fine. I tried -ss 0, no luck. This behavior is observed with .wav (RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 44100 Hz), same issue with different sample rate. I tested mp3 works fine.

  


  public async Task<memorystream> ConvertToPcmStreamAsync(Stream inputStream)&#xA;{&#xA;    var outputStream = new MemoryStream();&#xA;    &#xA;    var audioInput = new StreamPipeSource(inputStream);&#xA;    var audioOutput = new StreamPipeSink(outputStream);&#xA;&#xA;    await FFMpegArguments&#xA;        .FromPipeInput(audioInput)&#xA;        .OutputToPipe(audioOutput, options => options&#xA;            .WithCustomArgument("-ss 0 -f s16le -acodec pcm_s16le -ac 1"))&#xA;        .ProcessAsynchronously();&#xA;&#xA;    // Reset the position of the memory stream to the beginning&#xA;    outputStream.Position = 0;&#xA;&#xA;    return outputStream;&#xA;}&#xA;</memorystream>

  


• I need to cut a batch of MP4 files to exactly a fixed value of 299 seconds [closed]

  21 mai 2024, par DruidCtba

  I need some help :).

  


  I need to trim a batch of MP4 files to exactly 299 seconds, or 4 minutes and 59 seconds, and from what I've seen, ffmpeg can do this for me.

  


  I also need to merge them later on, all in batch, the files that were split above.

  


  I think two scripts can do this, it shouldn't be too complicated, but reading the ffmpeg documentation, I found it a bit tricky for me haha.

  


  The split can have segments like : Original_File_Name_001.MP4, Original_File_Name_002.MP4, and so on.

  


  I saw on github that there's a program, LOSSLESSCUT, which is great at doing this split, but it doesn't do it in batch, it's always one at a time.

  


  I appreciate all the help possible, either the two scripts, split and merge in batch, or pointing me to any free program that does this.

  


  Cheers.

  


  Druid®.