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Details

Type: Bug
Resolution: Fixed
Priority: P1: Critical
Fix Version/s: 6.5.4, 6.6.1
Affects Version/s: 6.5.2, 6.6.0 Beta3
Component/s: Multimedia
Labels:
- Reported_by_support_standard
Environment:
Windows 10 22H2, MSVC 2019 x64, VLC 3.0.18, ffplay 6.0 (installed from Chocolatey)

Commits:
2ec4170ac (dev), e2910eac2 (6.6), 9918c243b (6.5), 7ba178db0 (dev), 015b24017 (6.9), 5b4d30993 (6.8), a85cfeebc (dev), 034295c95 (6.9), 5e1d8bdfc (6.8)

Description

Code

import QtQuick
import QtMultimedia
import QtQuick.Controls.Fusion

Window {
    id: root
    width: 800
    height: 600
    visible: true
    title: `${video.source} (${video.playbackState})`

    Video {
        id: video
        anchors.fill: parent
        source: "rtsp://localhost:8090/stream"
    }
    
    Button {
        text: video.playbackState === MediaPlayer.StoppedState ? "Play" : "Stop"
        onClicked: {
            if (video.playbackState === MediaPlayer.StoppedState)
                video.play()
            else
                video.stop()
        }
    }
}

Steps to reproduce

Start a local RTSP server
- Example instructions: https://docs.videolan.me/vlc-user/3.0/en/advanced/streaming/rtsp_session.html
- Example Command Prompt command: vlc.exe http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4 --sout="#rtp {sdp=rtsp://:8090/stream}"
Run the code above
Click "Play"
Wait for the video to start playing (it might take ~10 seconds)
While Qt is still playing the video, play the same stream using ffplay
- Docs: https://ffmpeg.org/ffplay.html
- Example Command Prompt command: ffplay.exe rtsp://localhost:8090/stream

Outcomes

The issues faced by Qt appear before ffplay is launched, so they are not caused by having multiple receivers:

The video playback in Qt is choppy (video stream might freeze/glitch every now and then; audio stream might go silent every now and then)
The same video stream plays perfectly smoothly in ffplay
Qt shows missed packets in stderr:

[rtsp @ 000002842BA285C0] The profile-level-id field value is not a valid number: 64001f
qt.multimedia.ffmpeg.mediadataholder: AVStream duration -9223372036854775808 is invalid. Taking it from the metadata
qt.multimedia.ffmpeg.mediadataholder: AVStream duration -9223372036854775808 is invalid. Taking it from the metadata
"Invalid argument"
[rtsp @ 000002842BA285C0] method PAUSE failed: 405 Method not allowed
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 178 packets
    failed to get textures for frame; format: 172 textureConverter null
[rtsp @ 000002842BA285C0] jitter buffer full
[rtsp @ 000002842BA285C0] RTP: missed 413 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] jitter buffer full
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 1 packets
[rtsp @ 000002842BA285C0] max delay reached. need to consume packet
[rtsp @ 000002842BA285C0] RTP: missed 2 packets
...