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• Split video in specific number of frame with ffmpeg in c#

  30 avril 2017, par Loic Bch

  I want to split a video into a specific number of image :
  I’m using ffmpeg/EmguCV in C#.

  I capture a video from a webcam and i need to split the video into 59 images. i’m using -i command with ffmpeg to split my video into a number of images.

  The problem is that the number of images i get at the end is different at each capture because the duration of the video is not exactly the same due to fps drop.

  So if anyone know if it’s possible to specify that i want the video to be equally cut into 59 images. (Or any other idea to get what i want)

  (at the moment i’m taking the number of images i get from the cut and divide it by 59 then i’m taking one image in "the result" but i’ts not precise at all because if i get a decimal number im losing or adding images)

• Where to place the fontfile for the FFmpeg Android drawtext-Filter ?

  13 juin 2018, par jpGerhard

  I’m using the precompiled FFmpeg-Android by Bravobit (via gradle : implementation 'nl.bravobit:android-ffmpeg:1.1.5' ; based on WritingMind’s) with the intention of drawing the current timestamp/location onto a .mp4 file. I am completely new to FFmpeg and have started with Android Studio a few months ago.

  Information :

  • IDE : Android Studio
  • OS : OSX 10.13.5

  My problem :

  I don’t know whether the fontfile needs to be in the Application path on my Phone, in the Android Studio directory or just on a location on my MacBook (so it gets compiled when running the application).

  Basic FFmpeg commands (-version, ...) are working, but I can’t seem to figure out where I have to place my fontfile.

  My current command is as follows :

  -i /path/to/video.mp4 -vf drawtext=fontfile=/users/shared/fonts/arial.ttf :text='Hello World' /path/to/output.mp4

  I’ve tried a lot of variations and always received to following errors :

  Fontconfig error : Cannot load default config file
  [Parsed_drawtext_0 @ 0xecbfd420] impossible to init fontconfig
  [AVFilterGraph @ 0xec9cc140] Error initializing filter ’drawtext’ with args ’fontfile=/users/shared/fonts/arial.ttf:text=Hello World’
  Error reinitializing filters !
  Failed to inject frame into filter network : Unknown error occurred
  Error while processing the decoded data for stream #0:0
  Conversion failed !

  Does anyone have a suggestion on how to get this to work ?

• Where to place the fontfile for the FFmpeg drawtext-Filter ?

  18 juin 2018, par jpGerhard

  I’m using the precompiled FFmpeg-Android by Bravobit (via gradle : implementation 'nl.bravobit:android-ffmpeg:1.1.5' ; based on WritingMind’s) with the intention of drawing the current timestamp/location onto a .mp4 file. I am completely new to FFmpeg and have started with Android Studio a few months ago.

  Information :

  • IDE : Android Studio
  • OS : OSX 10.13.5

  My problem :

  I don’t know whether the fontfile needs to be in the Application path on my Phone, in the Android Studio directory or just on a location on my MacBook (so it gets compiled when running the application).

  Basic FFmpeg commands (-version, ...) are working, but I can’t seem to figure out where I have to place my fontfile.

  My current command is as follows :

  -i /path/to/video.mp4 -vf drawtext=fontfile=/users/shared/fonts/arial.ttf:text='Hello World' /path/to/output.mp4

  I’ve tried a lot of variations and always received to following errors :

  Fontconfig error : Cannot load default config file
  [Parsed_drawtext_0 @ 0xecbfd420] impossible to init fontconfig
  [AVFilterGraph @ 0xec9cc140] Error initializing filter ’drawtext’ with args ’fontfile=/users/shared/fonts/arial.ttf:text=Hello World’
  Error reinitializing filters !
  Failed to inject frame into filter network : Unknown error occurred
  Error while processing the decoded data for stream #0:0
  Conversion failed !

  Does anyone have a suggestion on how to get this to work ?