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  • Publier sur MédiaSpip

    13 juin 2013

    Puis-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

  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • Pas question de marché, de cloud etc...

    10 avril 2011

    Le vocabulaire utilisé sur ce site essaie d’éviter toute référence à la mode qui fleurit allègrement
    sur le web 2.0 et dans les entreprises qui en vivent.
    Vous êtes donc invité à bannir l’utilisation des termes "Brand", "Cloud", "Marché" etc...
    Notre motivation est avant tout de créer un outil simple, accessible à pour tout le monde, favorisant
    le partage de créations sur Internet et permettant aux auteurs de garder une autonomie optimale.
    Aucun "contrat Gold ou Premium" n’est donc prévu, aucun (...)

Sur d’autres sites (10800)

  • Revision d115dbc24c : Adjust style to match Google Coding Style a little more closely. Most of these

    30 octobre 2012, par Ronald S. Bultje

    Changed Paths : Modify /vp8/common/onyx.h Modify /vp8/encoder/bitstream.c Modify /vp8/encoder/dct.c Modify /vp8/encoder/encodeframe.c Modify /vp8/encoder/encodeintra.c Modify /vp8/encoder/firstpass.c Modify /vp8/encoder/generic/csystemdependent.c (...)

  • FFMPEG silencedetect output does not match Audacity Sound Finder

    12 avril 2017, par tngo

    I’m currently working on labeling sound sections in an audio file.

    When I ran my audio file through Audacity Sound Finder with the following settings this is what I get

    0.448980    0.498866    1
    
0.698413    0.927891    2
    
1.147392    1.426757    3
    
1.566440    1.815873    4

    These are the first 4 labels for the audio file where the sounds were found to be louder than -12dB.

    However when I ran the same audio file through FFMPEG silencedetect filter with n=-12dB:d=0.1 this is the output

    [silencedetect @ 000000000272a8c0] silence_start: -0.00712018
    
[silencedetect @ 000000000272a8c0] silence_end: 0.371519 | silence_duration: 0.378639
    
[silencedetect @ 000000000272a8c0] silence_start: 0.457279
    
[silencedetect @ 000000000272a8c0] silence_end: 0.650159 | silence_duration: 0.19288
    
[silencedetect @ 000000000272a8c0] silence_start: 0.828798
    
[silencedetect @ 000000000272a8c0] silence_end: 1.11456 | silence_duration: 0.28576
    
[silencedetect @ 000000000272a8c0] silence_start: 1.38608
    
[silencedetect @ 000000000272a8c0] silence_end: 1.8576 | silence_duration: 0.1
    
[silencedetect @ 000000000272a8c0] silence_start: 2.31488

    For FFMPEG to detect sound I’m considering silence_end to be sound_start and silence_start to be sound_end. With that logic the output from FFMPEG actually is

    0.371519 0.457279 1
    
0.650159 0.828798 2
    
1.11456  1.38608  3
    
1.8576   2.31488  4

    To me it seems like all the timestamps from FFMPEG are shifted to the left compare to Audacity Sound Finder. Is there something that I’m missing ?

    Any help would be much appreciated.
    Thanks,

  • FPS from RTSP stream info does not match actual framerate

    17 mai 2021, par Krapow

    I have a 25FPS RTSP stream coming from an IP-camera. I can successfully display the video stream. But when analyzing the stream with ffmpeg (ffprobe actually), I observe fewer frames per second rate :

    


    $ ffprobe -rtsp_transport tcp -i rtsp://camera_ip:554/stream -select_streams v:0 -show_frames -show_entries frame=coded_picture_number,pkt_pts_time -of csv=p=0
Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 640x480, 25 fps, 25 tbr, 90k tbn, 50 tbc
0.400000,0
0.080000,1
0.120000,2
0.200000,3
0.240000,4
0.320000,5
0.360000,6
0.440000,7
0.480000,8
0.560000,9
0.600000,10
0.680000,11
0.720000,12
0.800000,13
0.840000,14
0.920000,15
0.960000,16
1.040000,17
1.080000,18
1.160000,19
1.200000,20
1.280000,21
1.320000,22
1.400000,23
1.440000,24
1.520000,25
1.560000,26
1.640000,27
1.680000,28
1.760000,29
1.800000,30
1.880000,31
1.920000,32
2.000000,33


    


    We can clearly see the 80ms gap between some of the frames, resulting in a 16fps stream.

    


    I have observed the same framerate issue with GStreamer (printing information in the rtpjitterbuffer indicates the frame gap is sometimes 80ms and sometimes 40ms). But the weird thing is, I encountered the same issue with an HDMI-RJ45 decoder, and I doubt the same issue comes from 2 different devices.
I didn't get much more informations using -loglevel debug or trace.
Does anybody have an idea about what is going wrong in the stream ?

    


    (I used ffprobe 4.2.3 and the last "2021-05-09-git-8649f5dca6-full_build-www.gyan.dev" with the same results, and GStreamer 1.16.2 with a pipeline like "urisourcebin ! h264depay ! h264parse ! fakesink")

    


    EDIT : The camera skipping of frames was caused by the activation of a third stream in the options. I find it really weird that it skips exactly the same frames every seconds. However, I still haven't found the cause of the downrate on my RTSP encoder.
Anyway, this was actually hardware related and not software related.

    


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