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Autres articles (31)
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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 (...) -
La sauvegarde automatique de canaux SPIP
1er avril 2010, parDans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...) -
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
Sur d’autres sites (5259)
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ClassX installation "codec not found" due to dependencies [migrated]
25 mars 2014, par khateebClassX is an interactive lecture streaming system developed in the Electrical Engineering Department at Stanford University.
Unlike conventional lecture capturing systems, ClassX requires very simple consumer-grade equipment and minimal human operation.I faced problems during installing it, I hope you have a solution.
BTW : I successfully installed it 2 years ago, but now I think the problem as the dependencies and Ubuntu versions are different than the versions we used two years ago.
Detailed description of the problem :
- I’m using Ubuntu 12.04
- I followed the instructions @ ClassX installation guide, and all steps till step 4 are successfully done (the encoder bin file generated).
- When trying to encode the video using the classX web system, it shows the encoding completed after few seconds.However, there are no tiles generated.
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I tried to execute the command at CX_log.txt, and the following error appears.
mahmoud@Mahmoud-HP-Pavilion-dv5-Notebook-PC : $ sudo perl /var/www/ClassXWebSystem/system/publishers/web/actions/encode.pl "/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/lecSEven" "/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251" "/var/www/ClassXWebSystem/content/streaming/FALL_2013_2014/CS106A_FALL_2013_2014/lecSEven" "/var/www/ClassXWebSystem/system/publishers/bin" classx y n n
[sudo] password for mahmoud :
00068.jpg
..
.
00068.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251/00068.mp4’ :
Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2avc1mp41
encoder : Lavf52.39.0
Duration : 00:02:30.05, start : 0.000000, bitrate : 8141 kb/s
Stream #0.0(und) : Video : h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 8007 kb/s, 29.95 fps, 29.97 tbr, 2997 tbn, 59.94 tbc
Stream #0.1(und) : Audio : aac, 44100 Hz, stereo, s16, 128 kb/s
Output #0, mp4, to ’/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251/stream0.mp4’ :
Stream #0.0 : Video : [0][0][0][0] / 0x0000, yuv420p, 640x360, q=32-36, 64 kb/s, 90k tbn, 14.99 tbc
codec not found
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ClassX installation "codec not found" due to dependencies [migrated]
25 mars 2014, par khateebClassX is an interactive lecture streaming system developed in the Electrical Engineering Department at Stanford University.
Unlike conventional lecture capturing systems, ClassX requires very simple consumer-grade equipment and minimal human operation.I faced problems during installing it, I hope you have a solution.
BTW : I successfully installed it 2 years ago, but now I think the problem as the dependencies and Ubuntu versions are different than the versions we used two years ago.
Detailed description of the problem :
- I'm using Ubuntu 12.04
- I followed the instructions @ ClassX installation guide, and all steps till step 4 are successfully done (the encoder bin file generated).
- When trying to encode the video using the classX web system, it shows the encoding completed after few seconds.However, there are no tiles generated.
-
I tried to execute the command at CX_log.txt, and the following error appears.
mahmoud@Mahmoud-HP-Pavilion-dv5-Notebook-PC : $ sudo perl /var/www/ClassXWebSystem/system/publishers/web/actions/encode.pl "/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/lecSEven" "/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251" "/var/www/ClassXWebSystem/content/streaming/FALL_2013_2014/CS106A_FALL_2013_2014/lecSEven" "/var/www/ClassXWebSystem/system/publishers/bin" classx y n n
[sudo] password for mahmoud :
00068.jpg
..
.
00068.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251/00068.mp4' :
Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2avc1mp41
encoder : Lavf52.39.0
Duration : 00:02:30.05, start : 0.000000, bitrate : 8141 kb/s
Stream #0.0(und) : Video : h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 8007 kb/s, 29.95 fps, 29.97 tbr, 2997 tbn, 59.94 tbc
Stream #0.1(und) : Audio : aac, 44100 Hz, stereo, s16, 128 kb/s
Output #0, mp4, to '/var/www/ClassXWebSystem/content/encoding/FALL_2013_2014/CS106A_FALL_2013_2014/.encoding_1372706251/stream0.mp4' :
Stream #0.0 : Video : [0][0][0][0] / 0x0000, yuv420p, 640x360, q=32-36, 64 kb/s, 90k tbn, 14.99 tbc
codec not found
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SDL2 won't play with more than 6 audio channels
13 juin 2020, par Hiko HaietoI am trying to stream (raw) video and audio from a capture device as part of my home media setup (with my pc acting similarly to a receiver in a typical home theatre setup), but the biggest problem I haven't been able to get past is that I haven't been able to get ffplay (using SDL2 as its audio backend) to work with all 8 channels in 7.1 streams - two simply get dropped, despite it recognising 8 channel input or me specifying a 7.1 layout.



I have been able to confirm that all 8 channels are present in the source by first using ffmpeg to save the output of a speaker test to a file and playing that back with both mplayer (which works) and ffplay (which doesn't). I also wrote some minimal code to play the audio directly through SDL's API with the same result, so it's not the fault of ffplay. I might simply use mplayer if it weren't for the fact that piping output from ffmpeg adds too much latency for real-time use. I am using libSDL version 2.0.12 and ffplay 4.2.3, both of which are the latest at the time of writing and are ostensibly supposed to support 7.1 audio.



Using output recorded from
speaker-test -c 8, I am using the following to play it back in mplayer :


mplayer -channels 8 -rawaudio channels=8 -format s16le -demuxer rawaudio speaker-test.pcm



and the following to play it back in ffplay :



ffplay -f s16le -ac 8 -af 'channelmap=channel_layout=7.1' speaker-test.pcm



No matter what I try, the two side channels get dropped. I couldn't figure out how to play raw pcm in SDL, so I repeated the same tests with wav output and used the following code to play it back :



#include <sdl2></sdl2>SDL.h>

int main(int argc, char **argv) {
 SDL_Init(SDL_INIT_AUDIO);
 SDL_AudioSpec wavSpec;
 Uint32 wavLength;
 Uint8 *wavBuffer;
 SDL_LoadWAV("speaker-test.wav", &wavSpec, &wavBuffer, &wavLength);
 SDL_AudioDeviceID deviceID = SDL_OpenAudioDevice(NULL, 0, &wavSpec, NULL, 0);
 SDL_QueueAudio(deviceID, wavBuffer, wavLength);
 SDL_PauseAudioDevice(deviceID, 0);
 SDL_Delay(30000);
 SDL_CloseAudioDevice(deviceID);
 SDL_FreeWAV(wavBuffer);
 SDL_Quit();
 return 0;
}



The above code exhibits the same behaviour of dropping the two additional side channels, despite it being the latest version of SDL that should have supported 7.1 for many releases now. Why might this be happening, and how might I fix it ?


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