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GetID3 - Bloc informations de fichiers
9 avril 2013, par
Mis à jour : Mai 2013
Langue : français
Type : Image
Autres articles (42)
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Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
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 -
Ajouter notes et légendes aux images
7 février 2011, parPour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
Modification lors de l’ajout d’un média
Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)
Sur d’autres sites (5197)
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Best way to diagnose VideoCapture not opening the rtmp stream
8 janvier 2021, par Greg0ryI am pulling my hair off for a few days and I'm out of ideas.


I have two rtmp streams


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- first stream is transcoded directly by myself (I use ffmpeg to transcode) and then I attach to that stream with opencv - VideoCapture can open the stream with no problem
- second stream is transcoded by 3rd party system (this system captures video through WebRTC and then encodes to h264) - this stream cannot be opened by VideCapture no matter what I do






I can attach with pure ffmpeg to that dodgy stream and I can restream - but this is not ideal as introduces extra network traffic and latency.


I was playing with
OPENCV_FFMPEG_CAPTURE_OPTIONSenvironmental variable (I was trying to remove audio stream, change the video codec, playing with rtmp options like thisOPENCV_FFMPEG_CAPTURE_OPTIONS="loglevel;debug" python my_script.py) - no joy

So I figured I am trying to solve this problem from wrong end. I should somehow collect underlying ffmpeg logs that should be available when calling VideoCapture. So I tried to set
OPENCV_FFMPEG_CAPTURE_OPTIONS="v;debug"but I can see no ffmpeg output when calling VideoCapture.

This is very simple python3 script I was using during tests :


import cv2 as cv
dodgy_cap = cv.VideoCapture()
dodgy_cap.open('rtmp://my_local_ip_address/rtmp/dodgy_stream_name')
print(dodgy_cap.isOpened()) # always returns False
healthy_cap = cv.VideoCapture()
healthy_cap.open('rtmp://my_local_ip_address/rtmp/healthy_stream_name')
print(healthy_cap.isOpened()) # always returns True


I collected information about both streams with ffprobe, but even though they look different I cannot see what would be the difference that prevents opencv from opening VideoCapture for dodgy stream..


This is a fragment from (very) verbose log for healthy stream :


RTMP_ClientPacket, received: notify 254 bytes 
(object begin) 
Property: 
Property: 
(object begin) 
Property: 
Property: 
Property: 
Property: 
Property: 
Property: 
Property: 
Property: 
Property: 
Property: 
(object end) 
(object end) 
Metadata:
 duration 0.00
 width 2048.00
 height 1536.00
 videodatarate 0.00
 framerate 6.00
 videocodecid 7.00
 title Session streamed by "preview"
 comment h264Preview_01_main
 encoder Lavf58.20.100
 filesize 0.00

(... raw network packets ...)

Input #0, flv, from 'rtmp://my_local_ip_address/rtmp/healthy_stream_name':
 Metadata:
 title : Session streamed by "preview"
 comment : h264Preview_01_main
 encoder : Lavf58.20.100
 Duration: 00:00:00.00, start: 159.743000, bitrate: N/A
 Stream #0:0, 41, 1/1000: Video: h264 (High), 1 reference frame, yuv420p(progressive), 2048x1536, 0/1, 6 fps, 6 tbr, 1k tbn



And this is the fragment for dodgy stream :


RTMP_ClientPacket, received: notify 205 bytes 
(object begin) 
Property: 
(object begin) 
Property: 
Property: 
Property: 
Property: 
Property: 
Property: 
Property: 
Property: 
Property: 
(object end) 
(object end) 
RTMP_ReadPacket: fd=3 

(... raw network packets ...)

Input #0, flv, from 'rtmp://my_local_ip_address/rtmp/dodgy_stream_name':
 Duration: N/A, start: 4511.449000, bitrate: N/A
 Stream #0:0, 41, 1/1000: Video: h264 (High), 1 reference frame, yuv420p(progressive, left), 640x480, 0/1, 15.17 fps, 15.08 tbr, 1k tbn, 30 tbc
 Stream #0:1, 124, 1/1000: Audio: aac (LC), 48000 Hz, mono, fltp



Both streams don't require any authentication (they are not exposed to the outside world)


Dodgy stream contains audio but I don't think it is source of problem as I was able to connect to other healthy rtmp streams that contained audio..


I have no more ideas how can I debug this problem, please help..



I found in VideoCap documentation that I can enable exception mode, however it did not help much (it says where it failed but it does not say why) :


>>> dodgy_stream = cv.VideoCapture()
>>> dodgy_stream.setExceptionMode(True)
>>> dodgy_stream.open("rtmp://my_local_ip_address/rtmp/dodgy_stream_name")
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
cv2.error: OpenCV(4.5.0) /tmp/pip-req-build-s_nildlw/opencv/modules/videoio/src/cap.cpp:177: error: (-2:Unspecified error) could not open 'rtmp://my_local_ip_address/rtmp/dodgy_stream_name' in function 'open'
</module></stdin>

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FFMPEG : Use expression calculated from timestamp to drawtext [closed]
26 décembre 2020, par NicolasVUsing ffmpeg and draw text, I need write on the video something like that :


text=1+floor(BPM * mod(1000*t-StartCounter ;480000/BPM)/60000).


I don't know if I need use PTS or t.


StartCounter would be a variable in milliseconds, the text would appear at this point.


BPM is an integer variable between 100 and 180.


I would draw for instance with StartCounter = 3256 and BPM = 120.


Any help appreciated, thanks


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Convert stream to a stream on the fly with ffmpeg/avconv
6 juillet 2014, par ApacciI’m trying to convert flv stream to another mp3 or ogg stream. The point is I want to use mp3/ogg stream on HTML5 page, because flv stream can’t be played with HTML5. So, I configured avserver.conf :
Port 8090
BindAddress 0.0.0.0
MaxHTTPConnections 2000
MaxClients 1000
MaxBandwidth 1000
CustomLog -
<feed>
File /tmp/feed1.ffm
FileMaxSize 200K
ACL allow 127.0.0.1
</feed>
<stream>
Feed feed1.ffm
Format ogg
AudioBitRate 64
AudioChannels 1
AudioSampleRate 44100
NoVideo
</stream>
<stream>
ACL allow localhost
ACL allow 192.168.0.0 192.168.255.255
</stream>
<redirect>
URL http://www.libav.org/
</redirect>the command I use :
avconv -i http://some_stream_service?format=flv -acodec mp3 http://localhost:8090/feed1.ffmconsole output :
avconv version 9.13-6:9.13-0ubuntu0.14.04.1+fdkaac, Copyright (c) 2000-2014 the Libav developers
built on May 10 2014 17:26:31 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
[flv @ 0x126e020] max_analyze_duration reached
Input #0, flv, from 'http://some_stream_service?format=flv':
Metadata:
encoder : Lavf52.87.1
Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
Stream #0.0: Audio: aac, 44100 Hz, stereo, fltp, 31 kb/s
Output #0, ffm, to 'http://localhost:8090/feed1.ffm':
Metadata:
encoder : Lavf54.20.4
Stream #0.0: Audio: libmp3lame, 44100 Hz, stereo, fltp
Stream mapping:
Stream #0:0 -> #0:0 (aac -> libmp3lame)
Press ctrl-c to stop encoding
size= 1080kB time=66.14 bitrate= 133.8kbits/sIt looks like working, but I keep getting 0 bytes on web page
http://localhost:8090/test1.ogg. Does anybody have ideas what I’m doing wrong ?
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