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• FFMPEG - Download video in parts and concat, stutter at concat points

  23 juillet 2022, par rnbwSmn

  My goal is to download a video (or M3U8) in parts/chunks which I can later concat.

  


  For context, I would like to download videos in an Android Service which may be stopped at any time, so I think chunking is the right approach.

  


  After some time I got the "downloading the parts" right, using this. I would later put that in a function, and for now I chose the chunks to be 30 seconds long.

  


  %offset% = 30 * %part%

ffmpeg -ss %offset% -t 30 -i INPUT_FILE -avoid_negative_ts 1 out%part%.mp4


  


  The first line is just pseudocode, part is starting at 0.
This works fine, downloading 30 second long .mp4 files.

  


  After that I tried merging them together into a single .mp4. For the tests I only downloaded the first few parts.

  


  Concat command :

  


  ffmpeg -safe 0 -f concat -i concat.txt -c copy final.mp4


  


  This would be a very short concat.txt file :

  


  file 'out0.mp4'
file 'out1.mp4'


  


  The concat works but has one problem : At the point where both files are actually combined, so at 30 seconds, there is a small stutter in video and audio.

  


  So what I think is going on is that I download parts that are 30s long, starting at multiples of 30s so there is a small overlap ? In the "Details" part of the Windows file properties it also shows a length of 31 seconds, so the video is even longer than I want.

  


  I tried setting the duration of each part in the concat.txt, both to 30s and to 30s - 1 frame

  


  23.98 fps -> 1/23.98 spf = 0.0417s


  


  But with a duration of 30 as well as 29.9583, although it is better, there is still a small stutter.

  


  file 'out0.mp4'
duration 29.9583
file 'out1.mp4'
duration 29.9583


  


  I also tried with a different fileformat, .ts files, but the stutter was still there. I still think my timings are not quite right, but at this point I don't know where the problem is exactly. What do I need to change to remove the small stutter ?

  


• ydl erroring on download only getting partial download and an error on ydl.download([url])

  11 septembre 2022, par newtboot

  building an audio stream bot command for my custom discord bot but it keep throwing errors on ydl.download([url]) and only fetches a partial download assuming it disconnects from server before finishing download i'm not sure how to fix this error or if its just a syntax thing

  


  import discord
import aiohttp
import random
import youtube_dl
import os
from discord.ext import commands

@bot.command()
async def play(ctx, url : str):
    song_there = os.path.isfile("song.mp3")
    try:
        if song_there:
            os.remove("song.mp3")
    except PermissionError:
        await ctx.send("wait for current audion to finish or use the 'stop' command")
        return

    voiceChannel = discord.utils.get(ctx.guild.voice_channels, name='moosic')
    voice = discord.utils.get(bot.voice_clients, guild=ctx.guild)
    if voice is None or not voice.is_connected():
        await voiceChannel.connect()
    ydl_opts = {
        'format': 'bestaudio/best',
        'postprocessors': [{
            'key': 'FFmpegExtractAudio',
            'preferredcodec': 'mp3',
            'preferredquality': '192',
        }],
    }
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        ydl.download([url])
    for file in os.listdir("./"):
        if file.endswith(".mp3"):
            os.rename(file, "song.mp3")
    voice.play(discord.FFmpegPCMAudio("song.mp3"))


  


• Download SAMPLE-AES-CTR encrypted m3u8

  16 septembre 2022, par Kadir

  I searched but couldn't find a solution How can I download this video ?

  


  https://vod-l3c-eu-east-2.media.dssott.com/ps01/disney/8e61fbd9-80fb-44f0-8108-c67ca45942cc/r/composite_400k_CENC_CTR_FHD_SDR_4e79c2dc-8f22-4a07-ad09-ba0251f79b55_9cf2df75-4260-4820-ada6-f953579ffbb8.m3u8

  


  #EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:9
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PROGRAM-DATE-TIME:2019-01-01T00:00:00.000Z
#EXT-X-DATERANGE:ID="pod_0",START-DATE="2019-01-01T00:00:00.000Z",DURATION=3.000000001,X-START-OFFSET="0.0"
#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,KEYFORMAT="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed",KEYFORMATVERSIONS="1",URI="data:text/plain;base64,AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISEB5U5uPKPk0WpO7hIRwr3JI="
#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,KEYFORMAT="com.microsoft.playready",KEYFORMATVERSIONS="1",URI="data:text/plain;charset=UTF-16;base64,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"
#EXT-X-KEY:METHOD=SAMPLE-AES-CTR,KEYFORMAT="PRMNAGRA",KEYFORMATVERSIONS="1",URI="data:text/plain;base64,eyJrZXktaWQiOiIxZTU0ZTZlMy1jYTNlLTRkMTYtYTRlZS1lMTIxMWMyYmRjOTIiLCJlbWkiOiJjdHIiLCJwcm0iOiJleUpqYjI1MFpXNTBTV1FpT2lKamRISWlMQ0pyWlhsSlpDSTZJakZsTlRSbE5tVXpMV05oTTJVdE5HUXhOaTFoTkdWbExXVXhNakV4WXpKaVpHTTVNaUo5In0="
#EXT-X-MAP:URI="b890e39d-85ff-425b-9a45-c3ca1f3dd423/10c8-BUMPER/02/2400K/map.mp4"
#EXTINF:3.000000001,
b890e39d-85ff-425b-9a45-c3ca1f3dd423/10c8-BUMPER/02/2400K/00/00/00_000.mp4
#EXT-X-DISCONTINUITY
#EXT-X-DATERANGE:ID="pod_1",START-DATE="2019-01-01T00:00:03.000Z",DURATION=2122.000000001,X-START-OFFSET="3.000000001"
#EXT-X-MAP:URI="a04e8798-c29c-4bb2-b6a6-52845167f3a8/3704-MAIN/02/4250K/map.mp4"
#EXTINF:8,
a04e8798-c29c-4bb2-b6a6-52845167f3a8/3704-MAIN/02/2400K/00/00/00_000.mp4
#EXTINF:8,
a04e8798-c29c-4bb2-b6a6-52845167f3a8/3704-MAIN/02/2400K/00/00/08_000.mp4
#EXTINF:8,
a04e8798-c29c-4bb2-b6a6-52845167f3a8/3704-MAIN/02/2400K/00/00/16_000.mp4