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• Subtitle Overlay Isn't Working, how do I fix it ? [closed]

  27 octobre 2024, par michael tan

  I'm trying to make a program to create clips with subtitles, but instead of the overlaid subtitles syncing with the clip, they just start from the beginning of the movie.

  


  import subprocess
from moviepy.editor import VideoFileClip

def parse_srt(srt_file):
    """Parse the SRT file and return a list of subtitles with their timestamps."""
    subtitles = []
    with open(srt_file, 'r') as f:
        content = f.read().strip().split('\n\n')
        for entry in content:
            lines = entry.split('\n')
            if len(lines) >= 3:
                index = lines[0]
                timestamps = lines[1]
                text = '\n'.join(lines[2:])
                start, end = timestamps.split(' --> ')
                subtitles.append((start.strip(), end.strip(), text.strip()))
    return subtitles

def print_subtitles_in_range(subtitles, start_time, end_time):
    """Print subtitles that fall within the given start and end times."""
    for start, end, text in subtitles:
        start_seconds = convert_srt_time_to_seconds(start)
        end_seconds = convert_srt_time_to_seconds(end)
        if start_seconds >= start_time and end_seconds <= end_time:
            print(f"{start} --> {end}: {text}")


def convert_srt_time_to_seconds(time_str):
    """Convert SRT time format to total seconds."""
    hours, minutes, seconds = map(float, time_str.replace(',', '.').split(':'))
    return hours * 3600 + minutes * 60 + seconds

def create_captioned_clip(input_file, start_time, end_time, srt_file, output_file):
    # Step 1: Extract the clip from the main video
    clip = VideoFileClip(input_file).subclip(start_time, end_time)
    print("Clip duration:", clip.duration)
    temp_clip_path = "temp_clip.mp4"
    clip.write_videofile(temp_clip_path, codec="libx264")

    # Step 2: Parse the SRT file to get subtitles
    subtitles = parse_srt(srt_file)

    # Step 3: Print subtitles that fall within the start and end times
    print("\nSubtitles for the selected clip:")
    print_subtitles_in_range(subtitles, start_time, end_time)

    # Step 2: Add subtitles using FFmpeg
    ffmpeg_command = [
        "ffmpeg",
        "-ss", str(start_time),  # Seek to the start time of the clip
        "-i", input_file,        # Use the original input file for subtitles
        "-vf", f"subtitles='{srt_file}:force_style=Alignment=10,TimeOffset={start_time}'",  # Overlay subtitles
        "-t", str(end_time - start_time),  # Set duration for the output
        output_file
    ]

    print("Running command:", ' '.join(ffmpeg_command))
    subprocess.run(ffmpeg_command, capture_output=True, text=True)

# Define input video and srt file
input_video = "Soul.2020.720p.BluRay.x264.AAC-[YTS.MX].mp4"
subtitle_file = "Soul.2020.720p.BluRay.x264.AAC-[YTS.MX].srt"

# Define multiple clips with start and end times
clips = [
    {"start": (5 * 60), "end": (5 * 60 + 30), "output": "output_folder/captioned_clip1.mp4"},
    {"start": (7 * 60), "end": (7 * 60 + 25), "output": "output_folder/captioned_clip2.mp4"},
]

# Process each clip
for clip_info in clips:
    create_captioned_clip(input_video, clip_info["start"], clip_info["end"], subtitle_file, clip_info["output"])


  


  I thought the subtitles would sync with the clip automatically ; after that didn't work I tried to manually sync them by putting the start time, duration, and an offset, but it still didn't work. The subtitles still start from 0:00 of the movie. There's nothing wrong with the .srt file, it's formatted correctly.

  


• How to read video frame by frame in C# .NET Framework 4.8 ?

  27 septembre 2022, par Brendan Hill

  I need to read a video file (.mkv format, h264, 1280x720) frame by frame for video processing.

  


  I am stuck with .NET Framework 4.8 due to dependencies.

  


  Having tried Accord.net VideoFileReader I am unable to read them due to :

  


  [matroska,webm @ 0000024eb36e5c00] Could not find codec parameters for stream 0 (Video: h264, none(progressive), 1280x720): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Assertion desc failed at src/libswscale/swscale_internal.h:674


  


  Unfortunately Accord.NET does not give me much control over the ffmpeg request and the project seems to have died (and .NET Framework has died (and C# has died)).

  


  What are some alternatives which would allow me to read a .mkv file in h264 format frame by frame ?

  


  NOTE - FFmpeg.NET does not seem to support getting frame bitmaps ; neither does MediaToolkit :(

  


  NOTE - this page has the same problem (last comment 2020) but no resolution :( https://github.com/accord-net/framework/issues/713

  


• ffmpeg timeout with rtsp

  17 janvier 2024, par eSlavko

  I have script that capture image from wifi camera with ffmpeg.
It works fine until camera is not reachable due to network troubles.
The script stuck in ffmpeg capture and never exit. Is it possible to have some kind of timeout ? -stimeout (in miliseconds) seems not working.

  


  There is part of script that capture images. (there are some manipulation after that)

  


  #!/bin/bash
week="$(date '+%Y_%U')"
ts="$(date '+%Y-%m-%d_%H:%M:%S')"
ffmpeg -rtsp_transport tcp -y -i "rtsp://192.168.64.101" -frames:v 1 $week/$ts.jpg -stimeout 3000 -y


  


  I did test on other camera and results are :

  


  ffmpeg -y -i "rtsp://192.168.64.112:8554/profile0" -frames:v 1 Ilatest.jpg


  


  Does work OK, but with timeout of 5 seconds as

  


  ffmpeg -timeout 5000000 -y -i "rtsp://192.168.64.112:8554/profile0" -frames:v 1 Ilatest.jpg


  


  doesn't and I got error report as :

  


  ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
...
...
[rtsp @ 0x55d250488740] Unable to open RTSP for listening
rtsp://192.168.64.112:8554/profile0: Cannot assign requested address