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Revolution of Open-source and film making towards open film making
6 octobre 2011, par
Mis à jour : Juillet 2013
Langue : English
Type : Texte
Autres articles (30)
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Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir -
MediaSPIP Player : problèmes potentiels
22 février 2011, parLe lecteur ne fonctionne pas sur Internet Explorer
Sur Internet Explorer (8 et 7 au moins), le plugin utilise le lecteur Flash flowplayer pour lire vidéos et son. Si le lecteur ne semble pas fonctionner, cela peut venir de la configuration du mod_deflate d’Apache.
Si dans la configuration de ce module Apache vous avez une ligne qui ressemble à la suivante, essayez de la supprimer ou de la commenter pour voir si le lecteur fonctionne correctement : /** * GeSHi (C) 2004 - 2007 Nigel McNie, (...) -
Création définitive du canal
12 mars 2010, parLorsque votre demande est validée, vous pouvez alors procéder à la création proprement dite du canal. Chaque canal est un site à part entière placé sous votre responsabilité. Les administrateurs de la plateforme n’y ont aucun accès.
A la validation, vous recevez un email vous invitant donc à créer votre canal.
Pour ce faire il vous suffit de vous rendre à son adresse, dans notre exemple "http://votre_sous_domaine.mediaspip.net".
A ce moment là un mot de passe vous est demandé, il vous suffit d’y (...)
Sur d’autres sites (5193)
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Real time livestreaming - RPI FFmpeg and H5 Player
29 avril 2022, par VictorI work at a telehealth company and we are using connected medical devices in order to provide the doctor with real time information from these equipements, the equipements are used by a trained health Professional.


Those devices work with video and audio. Right now, we are using them with peerjs (so peer to peer connection) but we are trying to move away from that and have a RPI with his only job to stream data (so streaming audio and video).


Because the equipements are supposed to be used with instructions from a doctor we need the doctor to receive the data in real time.


But we also need the trained health professional to see what he is doing (so we need a local feed from the equipement)


How do we capture audio and video


We are using ffmpeg with a go client that is in charge of managing the ffmpeg clients and stream them to a SRS server.
This works but we are having a 2-3 sec delay when streaming the data. (rtmp from ffmpeg and flv on the front end)


ffmpeg settings :


("ffmpeg", "-f", "v4l2", `-i`, "*/video0", "-f", "flv", "-vcodec", "libx264", "-x264opts", "keyint=15", "-preset", "ultrafast", "-tune", "zerolatency", "-fflags", "nobuffer", "-b:a", "160k", "-threads", "0", "-g", "0", "rtmp://srs-url")


My questions


- 

- Is there a way for this set up to achieve low latency (<1 sec) (for the nurse and for the doctor) ?
- Is the way I want to achieve this good ? Is there a batter way ?






Flow schema


Data exchange and use case flow :






Note : The nurse and doctor use
HTTP-FLVto play the live stream, for low latency.



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Should I use aevalsrc or anullsrc ? I got flooded with "cur_dts is invalid st:0" or "Delay between the first packet", encoding stalls at frame 127
28 avril 2022, par jokoonContext : this command is generated with a python script, it aims at concatenating different small videos of different format, with a 0.5s pause, considering some video don't have an audio track.


ffmpeg.exe
-report
-i
input0.mp4
-i
input1.mp4
-i
input2.mp4
-i
input3.mp4
-i
input4.mp4
-i
input5.mp4
-i
input6.mp4
-i
input7.mp4
-i
input8.mp4
-f
lavfi
-i
color=c=black:s=480x270:d=0.5:r=24,format=yuv420p
-f
lavfi
-i
anullsrc
-filter_complex_script
filter_complex_script.txt
-map
[final_video]
-map
[final_audio]
-c:a
aac
concatenated-2022-04-27--23-53.mp4


—


[0]fps=24[fps0];
[fps0]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:-1:-1,setsar=1[rescaled0];
[1]fps=24[fps1];
[fps1]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:-1:-1,setsar=1[rescaled1];
[2]fps=24[fps2];
[fps2]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:-1:-1,setsar=1[rescaled2];
[3]fps=24[fps3];
[fps3]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:-1:-1,setsar=1[rescaled3];
[4]fps=24[fps4];
[fps4]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:-1:-1,setsar=1[rescaled4];
[5]fps=24[fps5];
[fps5]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:-1:-1,setsar=1[rescaled5];
[6]fps=24[fps6];
[fps6]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:-1:-1,setsar=1[rescaled6];
[7]fps=24[fps7];
[fps7]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:-1:-1,setsar=1[rescaled7];
[8]fps=24[fps8];
[fps8]scale=480:270:force_original_aspect_ratio=decrease,pad=480:270:-1:-1,setsar=1[rescaled8];
[rescaled0][10:a][9:v][10:a][rescaled1][10:a][9:v][10:a][rescaled2][10:a][9:v][10:a][rescaled3][10:a][9:v][10:a][rescaled4][10:a][9:v][10:a][rescaled5][5:a][9:v][10:a][rescaled6][6:a][9:v][10:a][rescaled7][7:a][9:v][10:a][rescaled8][8:a]concat=n=17:v=1:a=1[final_video][final_audio]


I either have thousands of

[mp4 @ 000002132cefe100] Delay between the first packet and last packet in the muxing queue is 10007800 > 10000000: forcing output

when I use


-f lavfi -i anullsrc
so I tried using-f lavfi -i aevalsrc=0:n=1

instead, I have have thousands of


cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)

The encoding "stalls" at frame 127, it keeps doing things, but the frame counter doesn't increment.


Here are the inputs :


I skipped the yuvj420p input as it generated warnings (looks like it's not a big problem)




Here is a log (I trimmed it a bit) : (I think it's a bit large for stackoverflow)




-
Real time livestreaming - RPI
24 avril 2022, par VictorI work at a telehealth company and we are using connected medical devices in order to provide the doctor with real time information from these equipements, the equipements are used by a trained health Professional.


Those devices work with video and audio. Right now, we are using them with peerjs (so peer to peer connection) but we are trying to move away from that and have a RPI with his only job to stream data (so streaming audio and video).


Because the equipements are supposed to be used with instructions from a doctor we need the doctor to receive the data in real time.


But we also need the trained health professional to see what he is doing (so we need a local feed from the equipement)


How do we capture audio and video


We are using ffmpeg with a go client that is in charge of managing the ffmpeg clients and stream them to a SRS server.
This works but we are having a 2-3 sec delay when streaming the data. (rtmp from ffmpeg and flv on the front end)


ffmpeg settings :


("ffmpeg", "-f", "v4l2", `-i`, "*/video0", "-f", "flv", "-vcodec", "libx264", "-x264opts", "keyint=15", "-preset", "ultrafast", "-tune", "zerolatency", "-fflags", "nobuffer", "-b:a", "160k", "-threads", "0", "-g", "0", "rtmp://srs-url")


My questions


- 

- Is there a way for this set up to achieve low latency (<1 sec) (for the nurse and for the doctor) ?
- Is the way I want to achieve this good ? Is there a batter way ?






Flow schema


Data exchange and use case flow


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