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• Why is long video taking long time before VideoJS player gets metadata to start playing ?

  7 mars 2015, par Tom Jenkinson

  Does anyone know why it is taking so long before the loadedmetadata event is fired for longer videos ?

  Here is an example : https://www.la1tv.co.uk/player/124/260

  I can see in developer tools that the file is still downloading when the event is fired, so it’s not like it’s having to download the whole file, it’s just having to get quite far though before the event is fired.

  The ffmpeg command I am using to encode the video from java is :

  RuntimeHelper.executeProgram(new String[] {config.getString("ffmpeg.location"), "-y", "-nostdin", "-timelimit", ""+config.getInt("ffmpeg.videoEncodeTimeLimit"), "-progress", ""+f.progressFile.getAbsolutePath(), "-i", source.getAbsolutePath(), "-vf", "scale=trunc(("+f.h+"*a)/2)*2:"+f.h, "-strict", "experimental", "-acodec", "aac", "-b:a", f.aBitrate+"k", "-ac", "2", "-ar", "48000", "-vcodec", "libx264", "-vprofile", "main", "-g", "48", "-b:v", f.vBitrate+"k", "-maxrate", f.vBitrate+"k", "-bufsize", f.vBitrate*2+"k", "-preset", "medium", "-crf", "16", "-vsync", "vfr", "-af", "aresample=async=1000", "-movflags", "+faststart", "-r", f.fr+"", "-f", "mp4", f.outputFile.getAbsolutePath()}, workingDir, null, null);

  which can be found here.

  It has the faststart flag set and I thought this meant the metadata would be inserted right at the beginning of the file ?

  Could it be an issue with the encode settings ?

  Thanks !

• Using Python script to cut long videos into chunks in FFMPEG

  23 février 2016, par Michael Hamilton

  Starting off by saying I’m not a programmer, but I really need the application this Python script I found says it can do.

  Auto-Splitting Script by Antarctic Nest of Icephoenix

  Basically I have a directory of long .MP4s that need to be cut into equal parts based on a total running time of 3 hours 15 minutes. For example, I would have an 8 hour video that needs to be cut into smaller parts each under 3:15:00.

  We’ve been manually crating FFMPEG codes to do this, but I found the Python script above that seems like it will do what we are needing. The issue is that I have no Python experience. I don’t know where in the script to enter in the folder path with the videos, or where to specify my codecs, or where to tell the program that the max time for each video chunk is 3:15:00.

  I’m on a 64-bit windows system working in command prompt

  Here’s what I have done :

  • Installed python 3
  • downloaded the script
  • I can click on the script to see the cmd window flash to indicate it’s running
  • I enter "C :\Python34\python.exe V :\ffmpeg\ffmpeg-split.py" into cmd

  • output is

    File "V :\ffmpeg\ffmpeg-split.py", line 16
    print "Split length can’t be 0"

      SyntaxError: Missing parentheses in call to 'print'

  I have no idea where to go from here. It seems like the script is loading properly, but I haven’t entered my variables. Any help with where to put the information would be appreciated.

  Here is the FFMPEG code we usually use :

  ffmpeg -i V :\ffmpeg\88518_63c392af.mp4 -vcodec libx264 -acodec copy -vf fps=fps=30000/1001 -ss 00:05:01.000 -t 02:43:49.000 V :\events\88518.mp4

  The ffmpeg codes we use :

  -i is a .mp4

  -vcodec h.264 codec

  -acodec should be “copy” or can be “libvo_aacenc”

  -vf fps=30000/1000 a forced fps of 29.97

  -ss is start time (we would use this to manually cut into parts along with -t)

  -t is duration (we would calculate the duration for each part as the total run time divided by the equal time under 3:15:00 be it two, three, or four parts)

  Thank you a million dollars

• Revision 118649 : un cache un peu long sur le js d’afficher_si (comme pour saisies.css.html)

  16 novembre 2019, par maieul@… — Log

  un cache un peu long sur le js d’afficher_si (comme pour saisies.css.html)