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• Dissappearing unicode characters in Windows

  3 juin 2014, par user3698015

  so what happens is that if the video title has a symbol that isn’t supported by your current locale then ffmpeg won’t be able to get to that file properly.

  Here’s one example

  ►2 HOURS BEST MELODIC DUBSTEP MIX APRIL 2013◄ ヽ( ≧ω≦)ﾉ

  as you may or may not be able to see, lots of symbols from unicode.

  The problem is that in cmd and ffmpeg, though cmd can see

  ►2 HOURS BEST MELODIC DUBSTEP MIX APRIL 2013◄ ヽ( ≧ω≦)ﾉ

  ffmpeg only sees

  2 HOURS DUBSTEP_DRUMSTEP MIX AUGUST 2013 ヽ(≧ω≦)ﾉ

  This is the exact error message (i’m using youtube-dl)

   [ffmpeg] Adding metadata to 'C:\Music\ToBeDone\2014-06-01\►2 HOURS DUBSTEP_DRUMSTEP MIX AUGUST 2013◄ ヽ( ≧ω≦)ﾉ.mp4'
  
      ERROR: C:\Music\ToBeDone\2014-06-01\2 HOURS DUBSTEP_DRUMSTEP MIX AUGUST 2013 ヽ(≧ω≦)ﾉ.mp4: No such file or directory
  
      ERROR: WARNING: unable to obtain file audio codec with ffprobe

  After some research i’ve determined that by changing the system locale you can change which symbols cmd can support.

  However

  ヽ

  Used to appear as a box in a question mark in United states locale. In japanese locale it appears as it does on your screen right now.

  the problem with

  ◄

  is that even though it’s not appearing as a question mark in a box (it’s appearing as how it should be), ffmpeg (or cmd) can’t detect it properly.

  These are the unique characters that i need to have a locale that supports

  Ö
  
  
  
  ◄ ヽ( ≧ω≦)ﾉ
  
  
  
  ( ͡° ͜ʖ ͡°)
  
  
  
  (_≧∇≦)
  
  
  
  †
  
  
  
  【

  More info on the problem in general

  https://github.com/rg3/youtube-dl/issues/2999
  
  
  
  
  
  and this is what's going on (Batch Script)
  
  
  
  @echo off
  
  setlocal
  
  cd C:\youtube-dl
  
  
  
  set /p "var1=Enter URL: " %=% pause
  
  if defined var1 set "var1=%var1:"=%"
  
  set "var2=%date:/=-%" 
  
  set "var3=%%(title)s.%%(ext)s"
  
  youtube-dl "%var1%" -ci -o "C:\Music\ToBeDone\%var2%\%var3%" -f best -x --no-mtime --add-metadata 
  
  youtube-dl "%var1%" --skip-download -ci -o "C:\Music\ToBeDone\%var2%\Thumbnail\%var3%" --write-thumbnail
  
  youtube-dl "%var1%" --skip-download -ci -o "C:\Music\ToBeDone\%var2%\Description\%var3%" --write-description

  edit :
  http://www.fileformat.info/info/unicode/char/25c4/index.htm
  so i found the symbol but i’m having trouble in finding out how each locale relates to the symbol...

  Like what about each locale makes the symbol usable to cmd ?

• Encoding and decoding timestamps per frame using libav* into mp4

  9 mai 2019, par Kevin

  I am writing a program for recording and playing back video together with another program that is connected to a piece of hardware we sell. This other program gathers data from hardware, which contains "timestamp" counters at a fixed sampling rate.

  I am looking for a way to encode these timestamps (either raw or converted to unix) into the outputted mp4 file. The main reason being that the video stream might only start getting saved a few minutes into the hardware acquisition

  Recording :

                  timestamp
  
  Main program --------------->  Video program
  
    |                                 |
  
    |                                 |
  
    v                                 v
  
  Save hardware data               Save frame data
  
    and timestamp                    and timestamp
  
  
  
    |                                 |
  
    |                                 |
  
    v                                 v
  
  Custom data format                .mp4 file

  Post processing analysis :

  for i in range(0,datalen):
  
      hardwareData, timestamp = readHardwareFile()
  
      frame, timestamp = readMP4()
  
  
  
      myData[timestamp].hardware = hardwareData
  
      mydata[timestamp].video = frame
  
  
  
  analyze(myData)

  The goal being that when a I want to playback in VLC, or with OpenCV, I have access to timestamps for each frame.

  I currently save it as a separate text file with timestamp and frame #, but I’m wondering if there is a more standardized way to do this.

• use ffmpeg parse byte[] in c#

  16 septembre 2018, par pedoc

  i am currently using ffmpeg via FFMPEG.AutoGen,i have two problems to solve

  1.how to use FFMPEG parse byte[] or Stream ?(main byte[],the data is h264 raw bytes.for some reason, I can’t store it as a file after using it.so,avformat_open_input not working for this)
  2.how to get AVFrame raw data to byte[] ?

  i’m newer,thanks fou you time.