Sur d’autres sites (13001)

• FFMPEG stream video to Youtube Live

  13 juin 2022, par BlessedHIT

  I have a mov file and I'm using ffmpeg to stream it to youtube live using the following command,

  


  ffmpeg -re -i "episode.mov" -pix_fmt yuvj420p -x264-params keyint=48:min-keyint=48:scenecut=-1 -b:v 4500k -b:a 128k -ar 44100 -acodec aac -vcodec libx264 -preset medium -crf 28 -threads 4 -f flv "rtmp://a.rtmp.youtube.com/live2/YOUTUBE.LIVESTREAM.KEY"


  


  But im getting the following message on youtube,

  


  YouTube is not receiving enough video to maintain smooth streaming. As such, viewers will experience buffering


  


  My ffmpeg output showed my bitrate being between 800 - 1000 mbps, way lower than what i have specified in my ffmpeg command.

  


  I am using a not so powerful virtual machine, and so i thought this might be why i am not getting the desired bitrate.

  


  To overcome my hardware limitations, I then decided to encode the file for streaming using this command :

  


  ffmpeg -i episode.mov -c:v libx264 -preset medium -b:v 4500k -maxrate 4500k -bufsize 6000k -vf "scale=1280:-1,format=yuv420p" -g 50 -c:a aac -b:a 128k -ac 2 -ar 44100 episode.flv


  


  Then I stream copy the file using :

  


  ffmpeg -re -i episode.flv -c copy -f flv "rtmp://a.rtmp.youtube.com/live2/YOUTUBE.LIVESTREAM.KEY"


  


  And that seems to give me a stream that youtube is happy with.

  


  My question is, is there a way I can rewrite my ffmpeg command to livestream with the desired bitrate without needing to first encode my mov to another file or is adding more memory the only way forward here ?

  


• Ffmpeg - How can I create HLS multiple language streams, in multiple qualities ?

  28 avril 2022, par Daniel Ellis

  Preface

  


  I'm working on converting videos from 4k to multiple qualities with multiple languages but am having issues with the multiple languages overlaying, sometimes losing quality and sometimes being out of sync. (this is less of a problem in the German audio, as this is voice over anyhow)

  


  We as a team are complete noobs in terms of Video / Audio + HLS — I'm a front end developer who has no experience of this so apologies if my question is poorly phrased

  


  ---

  


  Videos

  


  I have the video in a 4k format and have removed the original sound as I have English and German audio files that need to be overlayed. I am then taking these files and throwing them together into a .ts file like this :

  


  $ ffmpeg -i ep03-ns-4k.mp4 -i nkit-ep3-de-output.m4a -i nkit-ep3-en-output.m4a \
> -thread 0 -muxdelay 0 -y \
> -map 0:v -map 1 -map 2  -movflags +faststart -refs 1 \
> -vcodec libx264 -acodec aac -profile:v baseline -level 30 -ar 44100 -ab 64k -f mpegts out.ts 


  


  This outputs a 4k out.ts video, with both audio tracks playing.

  


  The hard part

  


  This is where I'm finding it tricky, I now need to convert this single file into multiple quality levels (480, 720, 1080, 1920) and I attempt this with the following command :

  


  ffmpeg -hide_banner -y -i out.ts \
-crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -ar 48000 \
-map 0:v:0 -map 0:v:0 -map 0:v:0 -map 0:v:0 \
-c:v:0 h264 -profile:v:0 main -filter:v:0 "scale=w=848:h=480:force_original_aspect_ratio=decrease" -b:v:0 1400k -maxrate:v:0 1498k -bufsize:v:0 2100k \
-c:v:1 h264 -profile:v:1 main -filter:v:1 "scale=w=1280:h=720:force_original_aspect_ratio=decrease" -b:v:1 2800k -maxrate:v:1 2996k -bufsize:v:1 4200k \
-c:v:2 h264 -profile:v:2 main -filter:v:2 "scale=w=1920:h=1080:force_original_aspect_ratio=decrease" -b:v:2 5600k -maxrate:v:2 5992k -bufsize:v:2 8400k \
-c:v:3 h264 -profile:v:3 main -filter:v:3 "scale=w=3840:h=1920:force_original_aspect_ratio=decrease" -b:v:3 11200k -maxrate:v:3 11984k -bufsize:v:3 16800k \
-var_stream_map "v:0 v:1 v:2 v:3" \
-master_pl_name master.m3u8 \
-f hls -hls_time 4 -hls_playlist_type vod -hls_list_size 0 \
-hls_segment_filename "%v/episode-%03d.ts" "%v/episode.m3u8"


  


  This creates the required qualities, but I'm now at a loss of how this might work with the audio

  


  Audio

  


  For the audio I run this command :

  


  ffmpeg -i out.ts -threads 0 -muxdelay 0 -y -map 0:a:0 -codec copy -f segment -segment_time 4 -segment_list_size 0 -segment_list audio-de/audio-de.m3u8 -segment_format mpegts audio-de/audio-de_%d.aac
ffmpeg -i out.ts -threads 0 -muxdelay 0 -y -map 0:a:1 -codec copy -f segment -segment_time 4 -segment_list_size 0 -segment_list audio-en/audio-en.m3u8 -segment_format mpegts audio-en/audio-en_%d.aac



  


  This creates the required audio segments.

  


  The question

  


  I realise this is quite an ask, but is there anything wrong with our inputs ? Is there a way that this can be done a bit more streamlined ?

  


  Any answers are greatly appreciated.

  


• Having problem in video stegano, the hiden message always lost

  5 avril 2022, par user7025125

  friend, i am currently looking for a way to video stegano. I successfully in splitting frames from video file and hide messages inside them. But when i combine these frames into video and trying to extract info from the hiden video, i always failed. I guess here is problem with video compression.

  


  Here is my code.

  


  from stegano import lsb
from os.path import isfile, join

import time  # install time ,opencv,numpy modules
import cv2
import numpy as np
import math
import os
import shutil
from moviepy.editor import *
from subprocess import call, STDOUT


def split_string(s_str, count=10):
    per_c = math.ceil(len(s_str)/count)
    c_cout = 0
    out_str = ''
    split_list = []
    for s in s_str:
        out_str += s
        c_cout += 1
        if c_cout == per_c:
            split_list.append(out_str)
            out_str = ''
            c_cout = 0
    if c_cout != 0:
        split_list.append(out_str)
    return split_list


def frame_extraction(video):
    if not os.path.exists("./tmp"):
        os.makedirs("tmp")    
    temp_folder = "./tmp"
    print("[INFO] tmp directory is created")

    vidcap = cv2.VideoCapture(video)
    count = 0

    while True:
        success, image = vidcap.read()
        if not success:
            break
        cv2.imwrite(os.path.join(temp_folder, "{:d}.png".format(count)), image)
        count += 1
        print("[INFO] frame {} is extracted".format(count))


def encode_string(input_string, root="./tmp/"):
    split_string_list = split_string(input_string)
    for i in range(0, len(split_string_list)):
        f_name = "{}{}.png".format(root, i)
        secret_enc = lsb.hide(f_name, split_string_list[i])
        secret_enc.save(f_name)
        print("[INFO] frame {} holds {}".format(f_name, lsb.reveal(f_name)))


def decode_string(video):
    frame_extraction(video)
    secret = []
    root = "./tmp/"
    for i in range(len(os.listdir(root))):
        f_name = "{}{}.png".format(root, i)
        print("[INFO] frame {} is decoding".format(f_name))
        secret_dec = lsb.reveal(f_name)
        if secret_dec == None:
            break
        secret.append(secret_dec)
    print("[INFO] secret is {}".format("".join(secret)))
    print(''.join([i for i in secret]))
    # clean_tmp()


def clean_tmp(path="./tmp"):
    if os.path.exists(path):
        shutil.rmtree(path)
        print("[INFO] tmp files are cleaned up")


def main():
    input_string = input("Enter the input string: ")
    f_name = input("enter the name of video: ")

    # 从源文件分离出帧
    frame_extraction(f_name)
    
    # 分离文件路径和扩展名
    file_path, file_extraction = os.path.splitext(f_name)
    
    # 创建输出音频文件
    audio_path = file_path + "_temp.mp3"
    video = VideoFileClip(f_name)
    video.audio.write_audiofile(audio_path)

    # 加密字符
    encode_string(input_string)

    # 从tmp文件夹的图片创建没有声音的视频
    fps=30
    img_root = r"./tmp/"
    # fourcc = cv2.VideoWriter_fourcc(*'mp4v')
    fourcc = cv2.VideoWriter_fourcc(*'XVID')
    video_file_path = file_path + "_temp.avi"
    # 获取tmp文件夹第一张视频的尺寸
    img = cv2.imread(img_root + "0.png")
    height, width, layers = img.shape
    size=(width,height)
    videoWriter = cv2.VideoWriter(video_file_path,fourcc=fourcc,fps=fps,frameSize=size)
    for i in range(len(os.listdir(img_root))):
        frame = cv2.imread(img_root+str(i)+'.png')
        videoWriter.write(frame)
    videoWriter.release()

    # 合并视频和音频     audio_path   video_file_path
    video = VideoFileClip(video_file_path)
    audio_clip = AudioFileClip(audio_path)
    video = video.set_audio(audio_clip)
    video.write_videofile(file_path + "_hide.avi")
    clean_tmp()


if __name__ == "__main__":
    while True:
        print("1.Hide a message in video 2.Reveal the secret from video")
        print("any other value to exit")
        choice = input()
        if choice == '1':
            main()
        elif choice == '2':
            decode_string(input("enter the name of video with extension: "))
        else:
            break



  


  I have tried mp4, avi, wov format. But none of them worked.

  


  IF YOU HAVE ANY IDEA OR SUGGESTION GIVEN TO ME, I WOULD BE VERY GRATEFUL