Recherche avancée

Sur d’autres sites (9145)

• How to extract a video snippet from a video file that is being written in by ffmpeg in realtime

  26 février 2015, par alex.b

  At the moment i am recording a LIVE stream video from youtube with youtube-dl (https://github.com/rg3/youtube-dl)

  The command i use for this :

  youtube-dl --id -f 92 https://www.youtube.com/watch?v=VYlQJbsVs48

  92 is a format code that i got after executing a command to get the formats, that gave me this list :

  format code  extension  resolution note
  
  140          m4a        audio only DASH audio  144k , m4a_dash container, aac  @128k (48000Hz)
  
  141          m4a        audio only DASH audio  272k , m4a_dash container, aac  @256k (48000Hz)
  
  160          mp4        256x144    DASH video  124k , 15fps, video only
  
  133          mp4        426x240    DASH video  258k , 30fps, video only
  
  134          mp4        640x360    DASH video  616k , 30fps, video only
  
  135          mp4        854x480    DASH video 1116k , 30fps, video only
  
  136          mp4        1280x720   DASH video 2216k , 30fps, video only
  
  137          mp4        1920x1080  DASH video 4141k , 30fps, video only
  
  151          mp4        72p        HLS
  
  132          mp4        240p       HLS
  
  92           mp4        240p       HLS
  
  93           mp4        360p       HLS
  
  94           mp4        480p       HLS
  
  95           mp4        720p       HLS
  
  96           mp4        1080p      HLS  (best)

  This is creating a file called VYlQJbsVs48.mp4.part that gets bigger and bigger of course.

  Is there a way to extract a video snippet from that live stream or form the part file ? Or maybe there is a better way of doing this ?

  What i have noticed is that if i force quit iTerm2 while youtube-dl is running the .part file it creates wont contain any index information (something to do with an moov atom not being present in the mp4 file - which is the information about the number of frames and other things - metadata i think), so it makes me think i cannot extract from the file.

  Maybe if there would be a way that youtube-dl can write the index information at all times or maybe another way that i can record the live stream and get video snippets while its recording.

  I forgot to mention i am doing this on OSX Yosemite. I have FFMPEG installed with homebrew and youtoube-dl

  I am more than happy to try stuff on UBUNTU if there is a solution.

  Any help would be greatly appreciated.

  Thank you.

  Alex

• Code forks fine on macbook laptop..but on Imac(Yosemite) I get errors in my shell script

  2 mars 2015, par arantx

  I’m still figuring out how to work within the terminal, mainly with FFmpeg at the moment. I have this code running for a while now on my macbook pro (snow leopard I think). It works fine, no glitches whatsover. I just got an Imac (yosemite) and I wanted to install the same code, but now it gives these minor stupid syntax errors - that are not at fault on my laptop ! Its seems bizar to me, but maybe it’s something I forgot to install .. like a certain library ? I’ve tried to use the same steps as before but ofcourse I might have forgotten about one..

  The code will make a clip of 5 seconds on every hour via the embedded webcam, (the hourly notice is being programmed within crontab). This is the shell script :

  ---

  #!/bin/bash
  
  
  
  FNAME=videocapture_`date +"%F_%H_%M"`.mpg
  
  echo $FNAME
  
  
  
  /usr/local/bin/ffmpeg -t 5 -f avfoundation -i "default" $FNAME

  ---

  And these are the erros (I tried to change a few small syntaxes to see if it would stop but it just finds new errors)

  "SyntaxError: EOL while scanning string literal
  
  Arantxas-iMac:~ arantx$ python /Users/arantx/Documents/terminal\ stuff/camera.sh 
  
    File "/Users/arantx/Documents/terminal stuff/camera.sh", line 3
  
      FNAME=videocapture_'date +"%F_%H_%M"`.mpeg
  
                                               ^
  
  SyntaxError: EOL while scanning string literal
  
  Arantxas-iMac:~ arantx$ python /Users/arantx/Documents/terminal\ stuff/camera.sh 
  
    File "/Users/arantx/Documents/terminal stuff/camera.sh", line 3
  
      FNAME=videocapture_'date +"%F_%H_%M"`.mpeg 
  
                                                ^
  
  SyntaxError: EOL while scanning string literal
  
  Arantxas-iMac:~ arantx$ python /Users/arantx/Documents/terminal\ stuff/camera.sh 
  
    File "/Users/arantx/Documents/terminal stuff/camera.sh", line 3
  
      FNAME=videocapture_'date +"%F_%H_%M"`.mp4"

  ---

  If someone can point something out that I might have missed, let me know !

  Kind regards,

  Arantxa

• Anomalie #3763 (Nouveau) : Rendre cohérent et simplifier l’appel à sa propre page d’auteur

  29 mars 2016, par touti touti

  Pour le moment il y a deux pages différentes qui répercutent presque les mêmes infos
  - ?exec=infos_perso qui possède en sus un menu de 3 onglets : Mes informations | Ma langue | Mes préférences) cette page serait à supprimer
  - ?exec=auteur&id_auteur=xx il faudrait juste ajouter ces 3 onglets lorsque l’auteur est reconnu en session

  Ça résoudrait aussi le fait que l’on ne sait pas quel est son propre identifiant auteur à moins de cliquer sur son nom pour ouvrir la page ?exec=infos_perso