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Autres articles (32)

  • XMP PHP

    13 mai 2011, par

    Dixit Wikipedia, XMP signifie :
    Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
    Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
    XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
    Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)

  • Other interesting software

    13 avril 2011, par

    We don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
    The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
    We don’t know them, we didn’t try them, but you can take a peek.
    Videopress
    Website : http://videopress.com/
    License : GNU/GPL v2
    Source code : (...)

Sur d’autres sites (6041)

  • Bewildering issue - FFmpeg segment filter desyncs video

    14 mai 2018, par r_jei

    I need to segment a large (72GB) Prores video file and merge the segments to get a file identical to the original.

    ./ffmpeg -i video.mov -codec copy -f segment -segment_time 300 -segment_list list.ffcat -reset_timestamps 1 -v error chunk_%d.mov

    Unfortunately the segments that come from running this command get out of sync after a few seconds of playback with Quicktime Player. Interestingly, seeking, rewinding or fast forwarding appears to resync the video correctly for at least a few seconds.

    The following warning appears whenever a new segment is written :

    [segment @ 0x7f87ae001200] Opening 'chunk_0.mov' for writing
    
[mov @ 0x7f87ad807200] Valid timecode frame rate must be specified. Minimum value is 1

    Yet, setting the framerate with -r 24 doesn’t help.

    Some potentially relevant metadata :

    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'A004_04121423_C001.mov':
    
  Duration: 00:13:31.25, start: 0.000000, bitrate: 710117 kb/s
    
    Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 3840x2160, 707415 kb/s, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc (default)
    
    Metadata:
    
      creation_time   : 2018-04-12T20:23:16.000000Z
    
      handler_name    : ?Apple Alias Data Handler
    
      timecode        : 14:23:16:02
    
    Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
    
    Metadata:
    
      creation_time   : 2018-04-12T20:23:16.000000Z
    
      handler_name    : ?Apple Alias Data Handler
    
      timecode        : 14:23:16:02
    
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
    
    Metadata:
    
      creation_time   : 2018-04-12T20:23:16.000000Z
    
      handler_name    : ?Apple Alias Data Handler
    
      timecode        : 14:23:16:02
    

    
Output #0, segment, to 'chunk_%d.mov':
    
    Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 707415 kb/s, 24 fps, 24 tbr, 12288 tbn, 24 tbc (default)
    
    Metadata:
    
      creation_time   : 2018-04-12T20:23:16.000000Z
    
      handler_name    : ?Apple Alias Data Handler
    
      timecode        : 14:23:16:02
    
    Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
    
    Metadata:
    
      creation_time   : 2018-04-12T20:23:16.000000Z
    
      handler_name    : ?Apple Alias Data Handler
    
      timecode        : 14:23:16:02
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)

    I’m on OS X.

    Thanks so much for your time and help on this issue ! I certainly hope I’m not missing something obvious :)

    UPDATE (May 10) : Comparing the original video file with the segments, I’ve found some interesting differences. Adobe Premiere reports that the original video has the following properties :

    QuickTime Details:
    
Movie contains 1 video track(s), 1 audio track(s), 0 closed caption track(s), **and 1 timecode track(s).**
    

    
Video:
    
There are 19470 frames with a **duration of 1/24th.**
    

    
Video track 1:
    
Duration is **0:13:31:06**
    

    
Video data block #1:
    
Frame Size = 3840 x 2160
    
Compressor = 
    
**Quality = Most (-2623.00)
    
Temporal = Most (1.00)**
    

    
Timecode data block #1:
    
Start Time = 14:23:16:02
    
Reel name =

    On the other hand, when examining the video resulting from stitching together the segments, we find the following :

    QuickTime Details:
    
Movie contains 1 video track(s), 1 audio track(s), 0 closed caption track(s), **and 0 timecode track(s).**
    

    
Video:
    
There are 19470 frames with a **duration of 41/1000ths.**
    

    
Video track 1:
    
Duration is **0:01:06:00**
    

    
Video data block #1:
    
Frame Size = 3840 x 2160
    
Compressor = 
    
**Quality = Normal (3.00)
    
Temporal = Normal (3.00)**

  • Parse closed captions from H264 stream (HDHomeRun)

    5 mai 2018, par Ladinn

    I’ve been researching on here and other websites for the past few days and haven’t found anything that accomplishes exactly what I’m looking for.

    I have an HDHomeRun that transmits cable TV over LAN. I’m hoping to parse only the closed captioning and get the text output. I’ll eventually be using Fluent FFmpeg so I would hope that the text can be easily piped through there or to a text file.

    Here is the output of ffprobe :

    Input #0, mpegts, from 'http://10.0.0.10:5004/auto/v819':
     Duration: N/A, start: 32788.639133, bitrate: N/A
     Program 6
       Stream #0:0[0x18f0]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
       Stream #0:1[0x18f1](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s
       Stream #0:2[0x18f2]: Data: scte_35
       Stream #0:3[0x18f3]: Unknown: none (ETV1 / 0x31565445)
       Stream #0:4[0x18f4]: Unknown: none (ETV1 / 0x31565445)
       Stream #0:5[0x18f5]: Unknown: none ([192][0][0][0] / 0x00C0)

    As you can see, "Closed Captions" are on Stream #0:0. The captions appear on the VLC client, so I know they’re there.

    As mentioned I’m hoping to use FFmpeg, but VLC’s command line would work too.

    Thanks !

  • FFmpeg creating multicast with multiple streams from one source (live source)

    1er mai 2018, par Netheme

    Hi :) I’m facing problems when creating multicast with multiple streams from one source (live source). The issue is that the encoding is slower than realtime. That is big issue for me as I’m processing live feed. The exact command and it’s output you can find here :

    Command

    ffmpeg -y -hwaccel cuvid -c:v h264_cuvid -vsync 0 -deint 2 -drop_second_field 1 -surfaces 10 -i 'udp://@239.10.150.2:5004?fifo_size=100000000&bitrate=12000000'  -map i:0xc77 -r:v:0 25 -filter:v:0 fps=25,scale_npp=640:360:format=same:interp_algo=lanczos -aspect:v:0 16:9 -g:v:0 80 -vcodec:v:0 h264_nvenc -b:v:0 400K -minrate:v:0 400k -maxrate:v:0 400k  -map i:0xc77 -r:v:1 25 -filter:v:1 fps=25,scale_npp=720:405:format=same:interp_algo=lanczos -aspect:v:1 16:9 -g:v:1 80 -vcodec:v:1 h264_nvenc -b:v:1 1000K -minrate:v:1 1000k -maxrate:v:1 1000k  -map i:0xc77 -r:v:2 25 -filter:v:2 fps=25,scale_npp=1280:720:format=same:interp_algo=lanczos -aspect:v:2 16:9 -g:v:2 80 -vcodec:v:2 h264_nvenc -b:v:2 2500K -minrate:v:2 2500K -maxrate:v:2 2500K  -map i:0xc77 -r:v:3 25 -filter:v:3 fps=25,scale_npp=1920:1080:format=same:interp_algo=lanczos -aspect:v:3 16:9 -g:v:3 80 -vcodec:v:3 h264_nvenc -b:v:3 4500K -minrate:v:3 4500K -maxrate:v:3 4500K  -map i:0xc7a -ab:a:0 128k -ar:a:0 48k -acodec:a:0 aac -ac:a:0 2  -map i:0xc7b -ab:a:1 128k -ar:a:1 48k -acodec:a:1 aac -ac:a:1 2  -map i:0xc7c -ab:a:2 128k -ar:a:2 48k -acodec:a:2 aac -ac:a:2 2  -map i:0xc7d -ab:a:3 128k -ar:a:3 48k -acodec:a:3 aac -ac:a:3 2  -f mpegts "udp://@239.100.0.23:3234?overrun_nonfatal_option=1&pkt_size=1316

    And the output (speed should be 1> i hope)

    Stream #0:0 -> #0:0 (h264 (h264_cuvid) -> h264 (h264_nvenc))
    
 Stream #0:0 -> #0:1 (h264 (h264_cuvid) -> h264 (h264_nvenc))
    
 Stream #0:0 -> #0:2 (h264 (h264_cuvid) -> h264 (h264_nvenc))
    
 Stream #0:0 -> #0:3 (h264 (h264_cuvid) -> h264 (h264_nvenc))
    
 Stream #0:1 -> #0:4 (mp2 (native) -> aac (native))
    
 Stream #0:2 -> #0:5 (mp2 (native) -> aac (native))
    
 Stream #0:3 -> #0:6 (mp2 (native) -> aac (native))
    
 Stream #0:4 -> #0:7 (mp2 (native) -> aac (native))
    
Press [q] to stop, [?] for help
    
Output #0, mpegts, to 'udp://@239.100.0.23:3234?overrun_nonfatal_option=1&pkt_size=1316':=  -0.0kbits/s speed=N/A    
    
 Metadata:
    
   encoder         : Lavf57.83.100
    
   Stream #0:0: Video: h264 (h264_nvenc) (Main), cuda, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 400 kb/s, 25 fps, 90k tbn, 25 tbc
    
   Metadata:
    
     encoder         : Lavc57.107.100 h264_nvenc
    
   Side data:
    
     cpb: bitrate max/min/avg: 400000/0/400000 buffer size: 800000 vbv_delay: -1
    
   Stream #0:1: Video: h264 (h264_nvenc) (Main), cuda, 720x405 [SAR 1:1 DAR 16:9], q=-1--1, 1000 kb/s, 25 fps, 90k tbn, 25 tbc
    
   Metadata:
    
     encoder         : Lavc57.107.100 h264_nvenc
    
   Side data:
    
     cpb: bitrate max/min/avg: 1000000/0/1000000 buffer size: 2000000 vbv_delay: -1
    
   Stream #0:2: Video: h264 (h264_nvenc) (Main), cuda, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 2500 kb/s, 25 fps, 90k tbn, 25 tbc
    
   Metadata:
    
     encoder         : Lavc57.107.100 h264_nvenc
    
   Side data:
    
     cpb: bitrate max/min/avg: 2500000/0/2500000 buffer size: 5000000 vbv_delay: -1
    
   Stream #0:3: Video: h264 (h264_nvenc) (Main), cuda, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 4500 kb/s, 25 fps, 90k tbn, 25 tbc
    
   Metadata:
    
     encoder         : Lavc57.107.100 h264_nvenc
    
   Side data:
    
     cpb: bitrate max/min/avg: 4500000/0/4500000 buffer size: 9000000 vbv_delay: -1
    
   Stream #0:4(cze): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
    
   Metadata:
    
     encoder         : Lavc57.107.100 aac
    
   Stream #0:5(eng): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
    
   Metadata:
    
     encoder         : Lavc57.107.100 aac
    
   Stream #0:6(hun): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
    
   Metadata:
    
     encoder         : Lavc57.107.100 aac
    
   Stream #0:7(ron): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s
    
   Metadata:
    
     encoder         : Lavc57.107.100 aac
    
frame= 2868 fps= 19 q=18.0 Lq=14.0 q=15.0 q=16.0 size=  134155kB time=00:01:55.88 bitrate=9484.0kbits/s speed=0.768x

    Does anyone have experiences with something like this ?

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