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• ffmpeg Command in Docker with Rust Tokio Closes Warp Server Connection (curl 52 Error)

  3 juin 2024, par user762345

  I’m encountering an issue where executing an ffmpeg concatenation command through Rust’s Tokio process in a Docker container causes subsequent HTTP requests to fail. The error occurs exclusively after running the ffmpeg command and making immediate requests, resulting in a “curl 52 empty response from server” error with the connection being closed. Notably, this issue does not occur when running the same setup outside of Docker. Additionally, if no HTTP requests are made after the ffmpeg command, the curl 52 error does not occur.

  


  Here is the verbose curl output of my minimum reproducible example (see below).

  


  curl -v "http://localhost:3030"
*   Trying 127.0.0.1:3030...
* Connected to localhost (127.0.0.1) port 3030 (#0)
> GET / HTTP/1.1
> Host: localhost:3030
> User-Agent: curl/8.1.2
> Accept: */*
> 
* Empty reply from server
* Closing connection 0
curl: (52) Empty reply from server


  


  Here are Docker logs from my minimum reproducible example (see below). The wav files are concatenated successfully, then the container appears to rebuild.

  


  [2024-06-03T05:26:58Z INFO  minimal_docker_webserver_post_error] Starting server on 0.0.0.0:3030
[2024-06-03T05:26:58Z INFO  warp::server] Server::run; addr=0.0.0.0:3030
[2024-06-03T05:26:58Z INFO  warp::server] listening on http://0.0.0.0:3030
[2024-06-03T05:27:07Z INFO  minimal_docker_webserver_post_error] WAV files concatenated successfully
[Running 'cargo run']
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.06s
     Running `target/debug/minimal_docker_webserver_post_error`
[2024-06-03T05:27:08Z INFO  minimal_docker_webserver_post_error] Starting server on 0.0.0.0:3030
[2024-06-03T05:27:08Z INFO  warp::server] Server::run; addr=0.0.0.0:3030
[2024-06-03T05:27:08Z INFO  warp::server] listening on http://0.0.0.0:3030


  


  What I have tried :
I tried using different web frameworks (Warp, Actix-web) and request crates (reqwest, ureq). I also tried running the setup outside of Docker, which worked as expected without any issues. Additionally, I tried running the setup in Docker without making any HTTP requests after the ffmpeg command, and the connection closed successfully without errors. I also tried posting to httpbin with a minimal request, but the issue persisted.

  


  Minimum reproducible example :

  


  main.rs

  


  use warp::Filter;&#xA;use reqwest::Client;&#xA;use std::convert::Infallible;&#xA;use log::{info, error};&#xA;use env_logger;&#xA;use tokio::process::Command;&#xA;&#xA;#[tokio::main]&#xA;async fn main() {&#xA;    std::env::set_var("RUST_LOG", "debug");&#xA;    env_logger::init();&#xA;&#xA;    let route = warp::path::end()&#xA;        .and_then(handle_request);&#xA;&#xA;    info!("Starting server on 0.0.0.0:3030");&#xA;    warp::serve(route)&#xA;        .run(([0, 0, 0, 0], 3030))&#xA;        .await;&#xA;}&#xA;&#xA;async fn handle_request() -> Result<impl infallible="infallible"> {&#xA;    let client = Client::new();&#xA;&#xA;    let output = Command::new("ffmpeg")&#xA;        .args(&amp;[&#xA;            "y",&#xA;            "-i", "concat:/usr/src/minimal_docker_webserver_post_error/file1.wav|/usr/src/minimal_docker_webserver_post_error/file2.wav",&#xA;            "-c", "copy",&#xA;            "/usr/src/minimal_docker_webserver_post_error/combined.wav"&#xA;        ])&#xA;        .output()&#xA;        .await;&#xA;&#xA;    match output {&#xA;        Ok(output) => {&#xA;            if output.status.success() {&#xA;                info!("WAV files concatenated successfully");&#xA;            } else {&#xA;                error!("Failed to concatenate WAV files: {:?}", output);&#xA;                return Ok(warp::reply::with_status("Failed to concatenate WAV files", warp::http::StatusCode::INTERNAL_SERVER_ERROR));&#xA;            }&#xA;        },&#xA;        Err(e) => {&#xA;            error!("Failed to execute ffmpeg: {:?}", e);&#xA;            return Ok(warp::reply::with_status("Failed to execute ffmpeg", warp::http::StatusCode::INTERNAL_SERVER_ERROR));&#xA;        }&#xA;    }&#xA;&#xA;    // ISSUE: Connection closes with curl: (52) Empty reply from server&#xA;    match client.get("https://httpbin.org/get").send().await {&#xA;        Ok(response) => info!("GET request successful: {:?}", response),&#xA;        Err(e) => error!("GET request failed: {:?}", e),&#xA;    }&#xA;&#xA;    match client.post("https://httpbin.org/post")&#xA;        .body("field1=value1&amp;field2=value2")&#xA;        .send().await {&#xA;        Ok(response) => info!("POST request successful: {:?}", response),&#xA;        Err(e) => error!("POST request failed: {:?}", e),&#xA;    }&#xA;&#xA;    Ok(warp::reply::with_status("Request handled", warp::http::StatusCode::OK))&#xA;}&#xA;</impl>

  


  FFMPEG command to generate the two wav files for concatenation

  


  ffmpeg -f lavfi -i "sine=frequency=1000:duration=5" file1.wav && ffmpeg -f lavfi -i "sine=frequency=500:duration=5" file2.wav


  


  Dockerfile

  


  # Use the official Rust image as the base image
FROM rust:latest

# Install cargo-watch
RUN cargo install cargo-watch

# Install ffmpeg
RUN apt-get update && apt-get install -y ffmpeg

# Set the working directory inside the container
WORKDIR /usr/src/minimal_docker_webserver_post_error

# Copy the Cargo.toml and Cargo.lock files
COPY Cargo.toml Cargo.lock ./

# Copy the source code
COPY src ./src

# Copy wav files
COPY file1.wav /usr/src/minimal_docker_webserver_post_error/file1.wav
COPY file2.wav /usr/src/minimal_docker_webserver_post_error/file2.wav

# Install dependencies
RUN cargo build --release

# Expose the port that the application will run on
EXPOSE 3030

# Set the entry point to use cargo-watch
CMD ["cargo", "watch", "-x", "run"]


  


  Cargo.toml

  


  [package]
name = "minimal_docker_webserver_post_error"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
warp = "0.3"
reqwest = { version = "0.12.4", features = ["json"] }
tokio = { version = "1", features = ["full"] }
log = "0.4"
env_logger = "0.11.3"


  


  Making the request to the warp server

  


  curl -v "http://localhost:3030"


  


• PyQt6 6.7.0 - How to fix error : No QtMultimedia backends found

  4 février, par Belleroph0N

  Problem on Windows 10 and Windows 11 using Anaconda.

  


  Here is the full error message for PyQt6=6.7.0 :

  


  No QtMultimedia backends found. Only QMediaDevices, QAudioDevice, QSoundEffect, QAudioSink, and QAudioSource are available.
Failed to initialize QMediaPlayer "Not available"
Failed to create QVideoSink "Not available"


  


  Installed PyQt6 using a requirements file :

  


  PyQt6
PyQt6-WebEngine
requests
pyserial
pynput


  


  Here are a couple things I tried :

  


  

  1. Reroll version back to PyQt6=6.6.1. This results in an error as well : ImportError : DLL load failed while importing QtGui : The specified procedure could not be found.

  


  2. I thought that missing ffmpeg might be the issue so I installed it, but the issue persists.

  


  3. Tried the setup on Ubuntu (WSL2) and the issue disappears, but there is just a black screen and nothing gets displayed in the widget. (EDIT : Got this up and running, the problem was with differences in file paths in linux vs windows.)

  


  


  I am new to PyQt so any pointers will be helpful !

  


  Edit : Here is generic code (taken from here) that gives the same error :

  


  from PyQt6.QtGui import QIcon, QFont
from PyQt6.QtCore import QDir, Qt, QUrl, QSize
from PyQt6.QtMultimedia import QMediaPlayer
from PyQt6.QtMultimediaWidgets import QVideoWidget
from PyQt6.QtWidgets import (QApplication, QFileDialog, QHBoxLayout, QLabel, QStyleFactory,
        QPushButton, QSizePolicy, QSlider, QStyle, QVBoxLayout, QWidget, QStatusBar)


class VideoPlayer(QWidget):

    def __init__(self, parent=None):
        super(VideoPlayer, self).__init__(parent)

        self.mediaPlayer = QMediaPlayer()

        btnSize = QSize(16, 16)
        videoWidget = QVideoWidget()

        openButton = QPushButton("Open Video")   
        openButton.setToolTip("Open Video File")
        openButton.setStatusTip("Open Video File")
        openButton.setFixedHeight(24)
        openButton.setIconSize(btnSize)
        openButton.setFont(QFont("Noto Sans", 8))
        openButton.setIcon(QIcon.fromTheme("document-open", QIcon("D:/_Qt/img/open.png")))
        openButton.clicked.connect(self.abrir)

        self.playButton = QPushButton()
        self.playButton.setEnabled(False)
        self.playButton.setFixedHeight(24)
        self.playButton.setIconSize(btnSize)
        self.playButton.setIcon(self.style().standardIcon(QStyle.StandardPixmap.SP_MediaPlay))
        self.playButton.clicked.connect(self.play)

        self.positionSlider = QSlider(Qt.Orientation.Horizontal)
        self.positionSlider.setRange(0, 0)
        self.positionSlider.sliderMoved.connect(self.setPosition)

        self.statusBar = QStatusBar()
        self.statusBar.setFont(QFont("Noto Sans", 7))
        self.statusBar.setFixedHeight(14)

        controlLayout = QHBoxLayout()
        controlLayout.setContentsMargins(0, 0, 0, 0)
        controlLayout.addWidget(openButton)
        controlLayout.addWidget(self.playButton)
        controlLayout.addWidget(self.positionSlider)

        layout = QVBoxLayout()
        layout.addWidget(videoWidget)
        layout.addLayout(controlLayout)
        layout.addWidget(self.statusBar)

        self.setLayout(layout)

        #help(self.mediaPlayer)
        self.mediaPlayer.setVideoOutput(videoWidget)
        self.mediaPlayer.playbackStateChanged.connect(self.mediaStateChanged)
        self.mediaPlayer.positionChanged.connect(self.positionChanged)
        self.mediaPlayer.durationChanged.connect(self.durationChanged)
        self.mediaPlayer.errorChanged.connect(self.handleError)
        self.statusBar.showMessage("Ready")

    def abrir(self):
        fileName, _ = QFileDialog.getOpenFileName(self, "Select Media",
                ".", "Video Files (*.mp4 *.flv *.ts *.mts *.avi)")

        if fileName != '':
            self.mediaPlayer.setSource(QUrl.fromLocalFile(fileName))
            self.playButton.setEnabled(True)
            self.statusBar.showMessage(fileName)
            self.play()

    def play(self):
        if self.mediaPlayer.playbackState() == QMediaPlayer.PlaybackState.PlayingState:
            self.mediaPlayer.pause()
        else:
            self.mediaPlayer.play()

    def mediaStateChanged(self, state):
        if self.mediaPlayer.playbackState() == QMediaPlayer.PlaybackState.PlayingState:
            self.playButton.setIcon(
                    self.style().standardIcon(QStyle.StandardPixmap.SP_MediaPause))
        else:
            self.playButton.setIcon(
                    self.style().standardIcon(QStyle.StandardPixmap.SP_MediaPlay))

    def positionChanged(self, position):
        self.positionSlider.setValue(position)

    def durationChanged(self, duration):
        self.positionSlider.setRange(0, duration)

    def setPosition(self, position):
        self.mediaPlayer.setPosition(position)

    def handleError(self):
        self.playButton.setEnabled(False)
        self.statusBar.showMessage("Error: " + self.mediaPlayer.errorString())

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    player = VideoPlayer()
    player.setWindowTitle("Player")
    player.resize(900, 600)
    player.show()
    sys.exit(app.exec())


  


  The videos I want to play are in the same folder as this .py file.
The conda env (python 3.9.2) I am working on has the following packages :

  


  certifi                     2024.6.2
charset-normalizer          3.3.2
idna                        3.7
pip                         24.0
pynput                      1.7.6
PyQt6                       6.7.0
PyQt6-Qt6                   6.7.1
PyQt6-sip                   13.6.0
PyQt6-WebEngine             6.7.0
PyQt6-WebEngine-Qt6         6.7.1
PyQt6-WebEngineSubwheel-Qt6 6.7.1
pyserial                    3.5
requests                    2.31.0
setuptools                  69.5.1
six                         1.16.0
urllib3                     2.2.1
wheel                       0.43.0


  


  PS : MacOS seems to have the same issue.

  


• There is no data in the inbound-rtp section of WebRTC. I don't know why

  13 juin 2024, par qyt

  I am a streaming media server, and I need to stream video to WebRTC in H.264 format. The SDP exchange has no errors, and Edge passes normally.

  


  These are the log debugging details from edge://webrtc-internals/. Both DTLS and STUN show normal status, and SDP exchange is also normal. I used Wireshark to capture packets and saw that data streaming has already started. The transport section (iceState=connected, dtlsState=connected, id=T01) also shows that data has been received, but there is no display of RTP video data at all.

  


  timestamp   2024/6/13 16:34:01
bytesSent   5592
[bytesSent_in_bits/s]   176.2108579387652
packetsSent 243
[packetsSent/s] 1.001198056470257
bytesReceived   69890594
[bytesReceived_in_bits/s]   0
packetsReceived 49678
[packetsReceived/s] 0
dtlsState   connected
selectedCandidatePairId CPeVYPKUmD_FoU/ff10
localCertificateId  CFE9:17:14:B4:62:C3:4C:FF:90:C0:57:50:ED:30:D3:92:BC:BB:7C:13:11:AB:07:E8:28:3B:F6:A5:C7:66:50:77
remoteCertificateId CF09:0C:ED:3E:B3:AC:33:87:2F:7E:B0:BD:76:EB:B5:66:B0:D8:60:F7:95:99:52:B5:53:DA:AC:E7:75:00:09:07
tlsVersion  FEFD
dtlsCipher  TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
dtlsRole    client
srtpCipher  AES_CM_128_HMAC_SHA1_80
selectedCandidatePairChanges    1
iceRole controlling
iceLocalUsernameFragment    R5DR
iceState    connected


  


  video recv info

  


  inbound-rtp (kind=video, mid=1, ssrc=2124085007, id=IT01V2124085007)
Statistics IT01V2124085007
timestamp   2024/6/13 16:34:49
ssrc    2124085007
kind    video
transportId T01
jitter  0
packetsLost 0
trackIdentifier 1395f18c-6ab9-4dbc-9149-edb59a81044d
mid 1
packetsReceived 0
[packetsReceived/s] 0
bytesReceived   0
[bytesReceived_in_bits/s]   0
headerBytesReceived 0
[headerBytesReceived_in_bits/s] 0
jitterBufferDelay   0
[jitterBufferDelay/jitterBufferEmittedCount_in_ms]  0
jitterBufferTargetDelay 0
[jitterBufferTargetDelay/jitterBufferEmittedCount_in_ms]    0
jitterBufferMinimumDelay    0
[jitterBufferMinimumDelay/jitterBufferEmittedCount_in_ms]   0
jitterBufferEmittedCount    0
framesReceived  0
[framesReceived/s]  0
[framesReceived-framesDecoded-framesDropped]    0
framesDecoded   0
[framesDecoded/s]   0
keyFramesDecoded    0
[keyFramesDecoded/s]    0
framesDropped   0
totalDecodeTime 0
[totalDecodeTime/framesDecoded_in_ms]   0
totalProcessingDelay    0
[totalProcessingDelay/framesDecoded_in_ms]  0
totalAssemblyTime   0
[totalAssemblyTime/framesAssembledFromMultiplePackets_in_ms]    0
framesAssembledFromMultiplePackets  0
totalInterFrameDelay    0
[totalInterFrameDelay/framesDecoded_in_ms]  0
totalSquaredInterFrameDelay 0
[interFrameDelayStDev_in_ms]    0
pauseCount  0
totalPausesDuration 0
freezeCount 0
totalFreezesDuration    0
firCount    0
pliCount    0
nackCount   0
minPlayoutDelay 0


  


  wireshark,I have verified that the SSRC in the SRTP is correct.

  


  enter image description here

  


  This player works normally when tested with other streaming servers. I don't know what the problem is. Is there any way to find out why the web browser cannot play the WebRTC stream that I'm pushing ?