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• FFmpegAudio object has no attribute _process

  28 janvier 2023, par Benjamin Tsoumagas

  I'm trying to make a Discord music bot that is remotely hosted and to do that I need ffmpeg to work. I was able to add it using my Dockerfile but upon trying to play music with the bot I get the following errors. For context, I am hosting on Fly.io and using python with the Nextcord library. Below is my relevant code and the error message. Please let me know if any more information is required.

  


  import nextcord, os, json, re, youtube_dl
from nextcord import Interaction, application_checks
from nextcord.ext import commands

youtube_dl.utils.bug_reports_message = lambda: ''

ytdl_format_options = {
    "format": "bestaudio/best",
    'outtmpl': '%(extractor)s-%(id)s-%(title)s.%(ext)s',
    'restrictfilenames': True,
    'noplaylist': True,
    'nocheckcertificate': True,
    'ignoreerrors': False,
    'logtostderr': False,
    'quiet': True,
    'no_warnings': True,
    'default_search': 'auto',
    'source_address': '0.0.0.0',
}

ffmpeg_options = {"options": "-vn"}

ytdl = youtube_dl.YoutubeDL(ytdl_format_options)

class YTDLSource(nextcord.PCMVolumeTransformer):
    def __init__(self, source, *, data, volume=0.5):
        super().__init__(source, volume)
        self.data = data
        self.title = data.get("title")
        self.url = data.get("url")

    @classmethod
    async def from_url(cls, url, *, loop=None, stream=False):
        loop = loop or asyncio.get_event_loop()
        data = await loop.run_in_executor(None, lambda: ytdl.extract_info(url, download=not stream))

        if "entries" in data:
            data = data["entries"][0]
        
        filename = data["url"] if stream else ytdl.prepare_filename(data)
        return cls(nextcord.FFmpegAudio(filename, *ffmpeg_options), data=data)

async def ensure_voice(interaction: Interaction):
    if interaction.guild.voice_client is None:
        if interaction.user.voice:
            await interaction.user.voice.channel.connect()
        else:
            await interaction.send("You are not connected to a voice channel.")
            raise commands.CommandError("Author not connected to a voice channel.")
    elif interaction.guild.voice_client.is_playing():
        interaction.guild.voice_client.stop()

class Music(commands.Cog, name="Music"):
    """Commands for playing music in voice channels"""

    COG_EMOJI = "🎵"

    def __init__(self, bot):
        self.bot = bot
    
    @application_checks.application_command_before_invoke(ensure_voice)
    @nextcord.slash_command()
    async def play(self, interaction: Interaction, *, query):
        """Plays a file from the local filesystem"""

        source = nextcord.PCMVolumeTransformer(nextcord.FFmpegPCMAudio(query))
        interaction.guild.voice_client.play(source, after=lambda e: print(f"Player error: {e}") if e else None)

        await interaction.send(f"Now playing: {query}")

    @application_checks.application_command_before_invoke(ensure_voice)
    @nextcord.slash_command()
    async def yt(self, interaction: Interaction, *, url):
        """Plays from a URL (almost anything youtube_dl supports)"""

        async with interaction.channel.typing():
            player = await YTDLSource.from_url(url, loop=self.bot.loop)
            interaction.guild.voice_client.play(
                player, after=lambda e: print(f"Player error: {e}") if e else None
            )

        await interaction.send(f"Now playing: {player.title}")

    @application_checks.application_command_before_invoke(ensure_voice)
    @nextcord.slash_command()
    async def stream(self, interaction: Interaction, *, url):
        """Streams from a URL (same as yt, but doesn't predownload)"""

        async with interaction.channel.typing():
            player = await YTDLSource.from_url(url, loop=self.bot.loop, stream=True)
            interaction.voice_client.play(
                player, after=lambda e: print(f"Player error: {e}") if e else None
            )

        await interaction.send(f"Now playing: {player.title}")

def setup(bot):
    bot.add_cog(Music(bot))


  


  2023-01-28T23:16:15Z app[7d3b734a] yyz [info]Exception ignored in: <function at="at" 0x7fa78ea61fc0="0x7fa78ea61fc0">&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]Traceback (most recent call last):&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]  File "/usr/local/lib/python3.10/site-packages/nextcord/player.py", line 116, in __del__&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]    self.cleanup()&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]  File "/usr/local/lib/python3.10/site-packages/nextcord/player.py", line 235, in cleanup&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]    self._kill_process()&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]  File "/usr/local/lib/python3.10/site-packages/nextcord/player.py", line 191, in _kill_process&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]AttributeError: &#x27;FFmpegA&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]AttributeError: &#x27;FFmpegA&#xA;dio&#x27; object has no attribute &#x27;_process&#x27;&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]Ignoring exception in command :&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]Traceback (most recent call last):&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]  File "/usr/local/lib/python3.10/site-packages/nextcord/application_command.py", line 863, in invoke_callback_with_hooks&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]    await self(interaction, *args, **kwargs)&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]  File "/main/cogs/music.py", line 153, in yt&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]    player = await YTDLSource.from_url(url, loop=self.bot.loop)&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]  File "/main/cogs/music.py", line 71, in from_url    &#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]    return cls(nextcord.FFmpegAudio(filename, *ffmpeg_options), data=data)&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]&#xA;The above exception was the direct cause of the following exception:&#xA;&#xA;re given&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]The above exception was the direct cause of the following exception:&#xA;2023-01-28T23:16:15Z app[7d3b734a] yyz [info]nextcord.errors.ApplicationInvokeError: Command raised an exception: TypeError: FFmpegAudio.__init__() takes 2 positional arguments but 3 were given     &#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]Exception ignored in: <function at="at" 0x7fa78ea61fc0="0x7fa78ea61fc0">&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]Traceback (most recent call last):&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]  File "/usr/local/lib/python3.10/site-packages/nextcord/player.py", line 116, in __del__&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]    self.cleanup()&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]  File "/usr/local/lib/python3.10/site-packages/nextcord/player.py", line 235, in cleanup&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]    self._kill_process()&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]  File "/usr/local/lib/python3.10/site-packages/nextcord/player.py", line 191, in _kill_process&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]    proc = self._process&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]AttributeError: &#x27;FFmpegAudio&#x27; object has no attribute &#xA;&#x27;_process&#x27;&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]Ignoring exception in command :&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]Traceback (most recent call last):&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]  File "/usr/local/lib/python3.10/site-packages/nextcord/application_command.py", line 863, in invoke_callback_with_hooks&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]    await self(interaction, *args, **kwargs)&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]  File "/main/cogs/music.py", line 153, in yt&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]    player = await YTDLSource.from_url(url, loop=self.bot.loop)&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]  File "/main/cogs/music.py", line 71, in from_url    &#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]    return cls(nextcord.FFmpegAudio(filename, *ffmpeg_options), data=data)&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]TypeError: FFmpegAudio.__init__() takes 2 positional arguments but 3 were given&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]The above exception was the direct cause of the following exception:&#xA;2023-01-28T23:16:19Z app[7d3b734a] yyz [info]nextcord.errors.ApplicationInvokeError: Command raised an exception: TypeError: FFmpegAudio.__init__() takes 2 positional arguments but 3 were given&#xA;</function></function>

  


  Similar posts have been made but their issues were typos in changing 'option' : '-vn' to 'options' : '-vn'. I've combed through for any other errors but I can't find any. I was hoping to see I made a similar mistake, but this is the template I was following from the Nextcord developers and I had no luck :

  


• Generating DASH manifest with ffmpeg works in Docker exec shell but not in os.exec golang

  22 février 2023, par Inquisitor

  I am trying to generate a DASH manifest with ffmpeg using this command

  


  /usr/bin/ffmpeg -f webm_dash_manifest -i ./480.webm -f webm_dash_manifest -i ./audio.webm -c copy -map 0:0 -map 1:0 -y -f webm_dash_manifest -adaptation_sets "id=0,streams=0 id=1,streams=1" ./manifest.mpd -loglevel repeat+level+verbose


  


  I run this in go, in a docker container as shown :

  


  func runFFmpeg(arguments []string) {
    arguments = append(arguments, "-loglevel", "repeat+level+verbose")
    cmd := exec.Command("ffmpeg", arguments...)

    fmt.Printf("cmd: %v\n", cmd)

    var out bytes.Buffer
    var stderr bytes.Buffer
    cmd.Stdout = &out
    cmd.Stderr = &stderr
    err := cmd.Run()

    if err != nil {
        log.Println(err)
        log.Println(stderr.String())
    }
}
runFFmpeg([]string{"-f", "webm_dash_manifest", "-i", "./480.webm", "-f", "webm_dash_manifest", "-i", "./audio.webm", "-c", "copy", "-map", "0:0", "-map", "1:0", "-y", "-f", "webm_dash_manifest", "-adaptation_sets", "\"id=0,streams=0 id=1,streams=1\"", "./manifest.mpd"})


  


  But I get this output :

  


   cmd: /usr/bin/ffmpeg -f webm_dash_manifest -i ./480.webm -f webm_dash_manifest -i ./audio.webm -c copy -map 0:0 -map 1:0 -y -copy_unknown -f webm_dash_manifest -adaptation_sets "id=0,streams=0 id=1,streams=1" ./manifest.mpd -loglevel repeat+level+verbose
 2023/02/22 04:45:17 exit status 1
 2023/02/22 04:45:17 [info] ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
 [info]   built with gcc 12.2.1 (Alpine 12.2.1_git20220924-r3) 20220924
 [info]   configuration: --prefix=/usr --enable-avfilter --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libpulse --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-libdav1d --enable-lto --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --enable-librist --enable-libsrt --enable-libssh --enable-libvidstab --disable-stripping --disable-static --disable-librtmp --disable-lzma --enable-libaom --enable-libopus --enable-libsoxr --enable-libwebp --enable-vaapi --enable-vdpau --enable-vulkan --enable-libdrm --enable-libzmq --optflags=-O2 --disable-debug --enable-libsvtav1
 [info]   libavutil      57. 28.100 / 57. 28.100
 [info]   libavcodec     59. 37.100 / 59. 37.100
 [info]   libavformat    59. 27.100 / 59. 27.100
 [info]   libavdevice    59.  7.100 / 59.  7.100
 [info]   libavfilter     8. 44.100 /  8. 44.100
 [info]   libswscale      6.  7.100 /  6.  7.100
 [info]   libswresample   4.  7.100 /  4.  7.100
 [info]   libpostproc    56.  6.100 / 56.  6.100
 [webm_dash_manifest @ 0x7fcec2836100] [warning] Could not find codec parameters for stream 0 (Video: vp9, 1 reference frame, none(tv, progressive, left), 640x480): unspecified pixel format
 Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
 [info] Input #0, webm_dash_manifest, from './480.webm':
 [info]   Metadata:
 [info]     title           : Big Buck Bunny, Sunflower version
 [info]     GENRE           : Animation
 [info]     MAJOR_BRAND     : isom
 [info]     MINOR_VERSION   : 1
 [info]     COMPATIBLE_BRANDS: isomavc1
 [info]     COMPOSER        : Sacha Goedegebure
 [info]     ARTIST          : Blender Foundation 2008, Janus Bager Kristensen 2013
 [info]     COMMENT         : Creative Commons Attribution 3.0 - http://bbb3d.renderfarming.net
 [info]     ENCODER         : Lavf59.27.100
 [info]   Duration: 00:10:34.60, bitrate: 352 kb/s
 [info]   Stream #0:0: Video: vp9, 1 reference frame, none(tv, progressive, left), 640x480, SAR 853:640 DAR 853:480, 30 fps, 30 tbr, 1k tbn (default)
 [info]     Metadata:
 [info]       HANDLER_NAME    : GPAC ISO Video Handler
 [info]       VENDOR_ID       : [0][0][0][0]
 [info]       ENCODER         : Lavc59.37.100 libvpx-vp9
 [info]       DURATION        : 00:10:34.600000000
 [info]       webm_dash_manifest_duration: 634600
 [info]       webm_dash_manifest_initialization_range: 889
 [info]       webm_dash_manifest_file_name: 480.webm
 [info]       webm_dash_manifest_track_number: 1
 [info]       webm_dash_manifest_cues_start: 27924928
 [info]       webm_dash_manifest_cues_end: 27927508
 [info]       webm_dash_manifest_bandwidth: 738287
 [info]       webm_dash_manifest_cluster_keyframe: 1
 [info]       webm_dash_manifest_cue_timestamps: 67,5067,10067,15067,20067,25067,30067,35067,40067,45067,50067,55067,60067,65067,70067,75067,80067,85067,90067,95067,100067,105067,110067,115067,120067,125067,130067,135067,140067,145067,150067,155067,160067,165067,170067,175067,180067,185067,190067,195067
 [info] Input #1, webm_dash_manifest, from './audio.webm':
 [info]   Metadata:
 [info]     title           : Big Buck Bunny, Sunflower version
 [info]     GENRE           : Animation
 [info]     MAJOR_BRAND     : isom
 [info]     MINOR_VERSION   : 1
 [info]     COMPATIBLE_BRANDS: isomavc1
 [info]     COMPOSER        : Sacha Goedegebure
 [info]     ARTIST          : Blender Foundation 2008, Janus Bager Kristensen 2013
 [info]     COMMENT         : Creative Commons Attribution 3.0 - http://bbb3d.renderfarming.net
 [info]     ENCODER         : Lavf59.27.100
 [info]   Duration: 00:05:35.91, bitrate: 120 kb/s
 [info]   Stream #1:0: Audio: vorbis, 48000 Hz, 5.1, fltp (default)
 [info]     Metadata:
 [info]       HANDLER_NAME    : GPAC ISO Audio Handler
 [info]       VENDOR_ID       : [0][0][0][0]
 [info]       ENCODER         : Lavc59.37.100 libvorbis
 [info]       DURATION        : 00:05:35.907000000
 [info]       webm_dash_manifest_duration: 335907
 [info]       webm_dash_manifest_initialization_range: 7411
 [info]       webm_dash_manifest_file_name: audio.webm
 [info]       webm_dash_manifest_track_number: 1
 [info]       webm_dash_manifest_cues_start: 5047497
 [info]       webm_dash_manifest_cues_end: 5048846
 [info]       webm_dash_manifest_bandwidth: 126994
 [info]       webm_dash_manifest_cluster_keyframe: 1
 [info]       webm_dash_manifest_cue_timestamps: 0,4986,9980,14962,19959,24956,29946,34930,39916,44911,49908,54892,59874,64868,69858,74858,79855,84847,89834,94834,99826,104826,109826,114818,119812,124799,129780,134770,139756,144743,149727,154719,159714,164706,169698,174687,179668,184667,189658,194650,19
 HERE'S THE ERROR --> [error] Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted
 [error] Error initializing output stream 0:1 -- 
 [info] Stream mapping:
 [info]   Stream #0:0 -> #0:0 (copy)
 [info]   Stream #1:0 -> #0:1 (copy)
 [error] 
 [AVIOContext @ 0x7fcebe23a840] [verbose] Statistics: 0 bytes written, 0 seeks, 0 writeouts
 [AVIOContext @ 0x7fcebe23a980] [verbose] Statistics: 5940786 bytes read, 133 seeks
 [AVIOContext @ 0x7fcebe23acc0] [verbose] Statistics: 2260628 bytes read, 72 seeks


  


  It works perfectly however if I run it within docker exec (exec into the container and run the command in bash). Also, note in the last output that the command is well formed when I print it out from go. File permissions are also not the problem since the command to create the video variants works with os.exec i.e

  


  runFFmpeg([]string{"-i", originalFilePath, "-c:v", "libvpx-vp9", "-keyint_min", "150", "-g", "150", "-tile-columns", "4", "-frame-parallel", "1", "-f", "webm", "-dash", "1", "-an", "-vf", fmt.Sprintf("scale=%s:%s", width, height), "-b:v", bitRate, "-dash", "1", "-y", destinationFilePath})


  


• Decode a proprietary (Genetec) H264 network video stream

  2 mars 2023, par al_mukthar

  I have incoming byte streams probably encoded in H264 from a Genetec camera through a websocket in my spring boot application,

  


  I need to decode the incoming H264 streams to transmit the video to my frontend clients.
I have tried using javaCV/FFMpeg but nothing works.

  


  I think, Genetec is using some custom encoding which is different from normal encoding

  


  Any help would be appreciated

  


  this is the part of hex dump received through socket

  


  00000000: 01 00 00 00 04 48 32 36 34 00 00 00 24 38 65 34    .....H264...$8e4
00000010: 32 39 65 37 61 2D 32 66 34 66 2D 34 37 31 61 2D    29e7a-2f4f-471a-
00000020: 39 61 63 30 2D 66 66 62 38 64 64 37 63 37 64 37    9ac0-ffb8dd7c7d7
00000030: 32 00 00 00 D4 7B 22 49 73 49 6E 69 74 22 3A 66    2...T{"IsInit":f
00000040: 61 6C 73 65 2C 22 49 73 41 75 64 69 6F 22 3A 66    alse,"IsAudio":f
00000050: 61 6C 73 65 2C 22 54 6F 74 61 6C 53 65 63 6F 6E    alse,"TotalSecon
00000060: 64 73 22 3A 30 2E 30 36 2C 22 46 72 61 6D 65 54    ds":0.06,"FrameT
00000070: 69 6D 65 22 3A 22 32 30 32 33 2D 30 32 2D 32 33    ime":"2023-02-23
00000080: 54 30 34 3A 32 31 3A 35 33 2E 35 33 31 5A 22 2C    T04:21:53.531Z",
00000090: 22 53 65 71 75 65 6E 63 65 49 64 22 3A 31 2C 22    "SequenceId":1,"
000000a0: 42 61 73 65 44 65 63 6F 64 65 54 69 6D 65 22 3A    BaseDecodeTime":
000000b0: 32 36 35 38 37 2C 22 4D 65 64 69 61 54 69 6D 65    26587,"MediaTime
000000c0: 22 3A 32 36 35 38 37 2C 22 49 73 46 72 61 6D 65    ":26587,"IsFrame
000000d0: 48 69 64 64 65 6E 22 3A 66 61 6C 73 65 2C 22 49    Hidden":false,"I
000000e0: 73 4B 65 79 46 72 61 6D 65 22 3A 66 61 6C 73 65    sKeyFrame":false
000000f0: 2C 22 49 64 22 3A 34 34 35 2C 22 47 65 6E 65 72    ,"Id":445,"Gener
00000100: 61 74 69 6F 6E 22 3A 31 7D 00 00 3F 50 00 00 00    ation":1}..?P...
00000110: 68 6D 6F 6F 66 00 00 00 10 6D 66 68 64 00 00 00    hmoof....mfhd...
00000120: 00 00 00 01 BD 00 00 00 50 74 72 61 66 00 00 00    ....=...Ptraf...
00000130: 10 74 66 68 64 00 02 00 00 00 00 00 01 00 00 00    .tfhd...........
00000140: 14 74 66 64 74 01 00 00 00 00 00 00 00 00 00 67    .tfdt..........g
00000150: DB 00 00 00 24 74 72 75 6E 01 00 0F 01 00 00 00    [...$trun.......
00000160: 01 00 00 00 70 00 00 00 3C 00 00 3E E0 00 01 00    ....p...<..>`...
00000170: 00 00 00 00 00 00 00 3E E8 6D 64 61 74 00 00 3E    .......>hmdat..>
00000180: DC 41 E1 81 80 93 BE 16 2B 33 77 3D 4C B6 55 8B    \Aa...>.+3w=L6U.
00000190: D2 55 60 92 05 F7 F7 A4 97 54 4B 6C A6 68 48 84    RU`..ww$.TKl&hH.
000001a0: 68 FF D2 B6 6C 02 31 FC 24 01 78 EA BD 20 AD 15    h.R6l.1|$.xj=.-.
000001b0: F1 73 31 4B EB EF 18 1B 50 B3 13 F2 DC C6 4C E1    qs1Kko..P3.r\FLa
000001c0: 75 8B 94 52 6B C5 09 37 55 1E 45 66 6A 92 39 23    u..RkE.7U.Efj.9#
000001d0: C9 2D FD BB EC AD FD CF C4 30 75 FF 44 66 FA 85    I-};l-}OD0u.Dfz.
000001e0: D9 7C 18 72 AE 63 45 60 DD D7 65 44 84 49 95 8D    Y|.r.cE`]WeD.I..
000001f0: 2C 70 6C 57 8E E9 A9 EB B6 F6 78 BD D6 88 99 F6    ,plW.i)k6vx=V..v
00000200: FC 25 B1 0A FF DF CB 77 6A 67 37 24 A5 3D 8F A1    |%1.._Kwjg7$%=.!
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  UPDATE TO THE CODE

  


  1st Packet find here
2nd Packet find here

  


  I have updated the code as per one of the comment to read only MDAT box to retrieve H264 stream from the incoming bytes[] through the socket, now I send only MDAT box contents (next byte after MDAT box)

  


  public Map.Entry> hasMdat(byte[] byteArray) {
    for (int i = 0; i < byteArray.length - 3; i++) {
        if (byteArray[i] == (byte) 109 &&
                byteArray[i + 1] == (byte) 100 &&
                byteArray[i + 2] == (byte) 97 &&
                byteArray[i + 3] == (byte) 116) {

            return Map.entry(true, Arrays.asList(i, i + 1, i + 2, i + 3));
        }
    }
    return Map.entry(false, List.of(0));
}


  


  This is my code which handles the byte stream

  


  initSocketConnection(new VideoStreamCallback() {
        @Override
        public void onVideoStreamReceived(byte[] bytes) {
           
Map.Entry> b = hasMdat(bytes);
        if (b.getKey()) {
            byte[] b1 = Arrays.copyOfRange(bytes, b.getValue().get(3) + 1, bytes.length);
  //write b1 back to client using spring SSE
            
        }

        }
    });