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Autres articles (111)
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La file d’attente de SPIPmotion
28 novembre 2010, parUne file d’attente stockée dans la base de donnée
Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...) -
Contribute to documentation
13 avril 2011Documentation is vital to the development of improved technical capabilities.
MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
To contribute, register to the project users’ mailing (...) -
Ajouter des informations spécifiques aux utilisateurs et autres modifications de comportement liées aux auteurs
12 avril 2011, parLa manière la plus simple d’ajouter des informations aux auteurs est d’installer le plugin Inscription3. Il permet également de modifier certains comportements liés aux utilisateurs (référez-vous à sa documentation pour plus d’informations).
Il est également possible d’ajouter des champs aux auteurs en installant les plugins champs extras 2 et Interface pour champs extras.
Sur d’autres sites (7868)
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Anomalie #2380 (Nouveau) : bandeau
24 octobre 2011, par Alexandre CUn petit bug sur le bandeau de /ecrire en SPIP 3.0.0-beta [18629], pour le second niveau des raccourcis de création d’objets : Si l’on a mis dans ses préférences "Menu de navigation"=>Afficher uniquement le texte les mini-icones gauche restent, mais celles de droite disparaissent et se retrouvent (...)
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Anomalie #4751 : Refonte du jeu d’icônes : retours et commentaires
30 avril 2021Ah oui, tiens je repense aussi à "squelettes par rubriques" et je trouve dommage de s’éloigner du # du menu squelettes. La tête de mort est très jolie j’admets ! mais ça aide pas à trouver une iconographie commune pour le terme "squelettes" quoi.
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Why is there an audio delay on recording video stream with ffmpeg ?
25 décembre 2023, par mqwertyI am trying to record video and audio stream (Line in Microphone Analog Audio) which are streaming from broadcaster computer with those parameters in the recorder computer ;


ffmpeg record parameters :


/usr/bin/ffmpeg -y -buffer_size max -thread_queue_size 8192 -i udp://225.0.5.11:1026 -buffer_size max -thread_queue_size 8192 -i udp://225.0.5.11:1032 -map 0:v -map 1:a -metadata title=COMPUTER-01_metadata_file -metadata creation_time="2023-12-25 13:25:29" -threads 0 -c:v copy -c:a copy -movflags +faststart -f segment -segment_time 01:00:00 -segment_atclocktime 1 -reset_timestamps 1 -strftime 1 -segment_format mp4 -t 120 test_record_video_with_audio_%Y-%m-%d_%H-%M-%S.mp4



The ffmpeg started and finished successfully, but when I open the recorded video with mpv like (mpv test_record_video_with_audio.mp4), I realized that there is a 5-6 seconds delay in audio. How can I prevent the delay of audio in the recorded mp4 file without using offset ? My last option is setting offset but I think that it is not safe according to any changes in network or etc.


FFMPEG version on both computer :


ffmpeg version 4.2.9 Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 8 (GCC)



BROADCASTER COMPUTER :


sysctl.conf :


No added configurations.



ethtool output :


Supported ports: [ TP ]
Supported link modes: 100baseT/Full
 1000baseT/Full
 10000baseT/Full
 2500baseT/Full
 5000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 100baseT/Full
 1000baseT/Full
 10000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: 10000Mb/s
Duplex: Full
Auto-negotiation: on
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
MDI-X: Unknown
Supports Wake-on: d
Wake-on: d
 Current message level: 0x00000007 (7)
 drv probe link
Link detected: yes



ffmpeg video stream :


ffmpeg -fflags +genpts -f x11grab -framerate 30 -video_size uhd2160 -i :0 -c:v hevc_nvenc -preset fast -pix_fmt bgr0 -b:v 3M -g 25 -an -f mpegts udp://225.0.5.11:1026



ffmpeg audio stream :


ffmpeg -f alsa -i hw:0,0 -c:a aac -ar 48000 -b:a 1024K -ab 512k -f rtp_mpegts rtp://225.0.5.11:1032



nvidia-smi :


| NVIDIA-SMI 535.129.03 Driver Version: 535.129.03 CUDA Version: 12.2 |
|-----------------------------------------+----------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+======================+======================|
| 0 NVIDIA T400 4GB Off | 00000000:5B:00.0 Off | N/A |
| 38% 38C P8 N/A / 31W | 207MiB / 4096MiB | 0% Default |
| | | N/A |
+-----------------------------------------+----------------------+----------------------+
| 1 NVIDIA RTX A4000 Off | 00000000:9E:00.0 Off | Off |
| 41% 59C P2 41W / 140W | 766MiB / 16376MiB | 17% Default |
| | | N/A |
+-----------------------------------------+----------------------+----------------------+
 
+---------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=======================================================================================|
| 0 N/A N/A 3227 G /usr/libexec/Xorg 114MiB |
| 0 N/A N/A 3423 G /usr/bin/gnome-shell 87MiB |
| 1 N/A N/A 3227 G /usr/libexec/Xorg 285MiB |
| 1 N/A N/A 3423 G /usr/bin/gnome-shell 91MiB |
| 1 N/A N/A 3762 C ffmpeg 372MiB |
+---------------------------------------------------------------------------------------+



lscpu output :




Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 96
On-line CPU(s) list: 0-95
Thread(s) per core: 2
Core(s) per socket: 24
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
BIOS Vendor ID: Intel(R) Corporation
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Gold 5220R CPU @ 2.20GHz
BIOS Model name: Intel(R) Xeon(R) Gold 5220R CPU @ 2.20GHz
Stepping: 7
CPU MHz: 2200.000
CPU max MHz: 4000.0000
CPU min MHz: 1000.0000
BogoMIPS: 4400.00
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 1024K
L3 cache: 36608K
NUMA node0 CPU(s): 0-23,48-71
NUMA node1 CPU(s): 24-47,72-95



OS : CentOS Stream release 8



RECORDER COMPUTER :


sysctl.conf :


net.core.rmem_max=16777216
net.core.wmem_max=16777216
net.ipv4.tcp_rmem= 4096 87380 16777216
net.ipv4.tcp_wmem= 4096 65536 16777216
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_no_metrics_save = 0
net.core.netdev_max_backlog = 50000
net.core.optmem_max=25165824



lscpu output :


Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 96
On-line CPU(s) list: 0-95
Thread(s) per core: 2
Core(s) per socket: 24
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
BIOS Vendor ID: Intel
CPU family: 6
Model: 106
Model name: Intel(R) Xeon(R) Gold 5318Y CPU @ 2.10GHz
BIOS Model name: Intel(R) Xeon(R) Gold 5318Y CPU @ 2.10GHz
Stepping: 6
CPU MHz: 3400.000
CPU max MHz: 3400.0000
CPU min MHz: 800.0000
BogoMIPS: 4200.00
Virtualization: VT-x
L1d cache: 48K
L1i cache: 32K
L2 cache: 1280K
L3 cache: 36864K



ethtool output :


Supported ports: [ TP ]
 Supported link modes: 1000baseT/Full
 10000baseT/Full
 Supported pause frame use: Symmetric Receive-only
 Supports auto-negotiation: Yes
 Supported FEC modes: Not reported
 Advertised link modes: 1000baseT/Full
 10000baseT/Full
 Advertised pause frame use: Symmetric
 Advertised auto-negotiation: Yes
 Advertised FEC modes: Not reported
 Speed: 10000Mb/s
 Duplex: Full
 Auto-negotiation: on
 Port: Twisted Pair
 PHYAD: 12
 Transceiver: internal
 MDI-X: Unknown
 Supports Wake-on: d
 Wake-on: d
 Current message level: 0x00002081 (8321)
 drv tx_err hw
 Link detected: yes



No NVIDIA Graphic Driver


OS : CentOS Stream release 8



I tried audio encoding while recording like :


"-c:a", "aac", 
"-ar", "48000", 
"-b:a", "128k",



I also tried :


"aresample=async=1"




Unfortunately,these did not have any improvements on preventing latency in audio.