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• no audio properties when converting with ffmpeg

  11 septembre 2014, par Ukemi

  I made a simple wrapper around ffmpeg, but I found out when i use ffmpeg like this:

  ffmpeg -i input.flac output.mp3 
  

  the output.mp3 wont have any audio properties. I'm not an audio guy so im not sure whats going on or how to fix it, but if I right click my output mp3, and go to the audio properties tab, there's no info listed there. Is there anything i can do to retain that info?

• Ffmpeg does not correctly defines FPS

  11 septembre 2014, par MrNikobraz

  I have 2 videofiles with different resolution CIF(352*288) and D1(704*576), both with 6fps. When converting video with CIF resolution duration is 15:00. And when converting video with D1 resolution duration is 3:36. I.e. ffmpeg does not understand framerate D1 video and compresses 6fps to 25fps without loss of frames.

  Mediainfo D1 video:
  Format                           : AVC
  Format/Info                      : Advanced Video Codec
  Format profile                   : Baseline@L3.0
  Format settings, CABAC           : No
  Format settings, ReFrames        : 2 frames
  Width                            : 704 pixels
  Height                           : 576 pixels
  Display aspect ratio             : 1.222
  Standard                         : PAL
  Color space                      : YUV
  Chroma subsampling               : 4:2:0
  Bit depth                        : 8 bits
  
  Mediainfo CIF video:
  Video
  Format                           : AVC
  Format/Info                      : Advanced Video Codec
  Format profile                   : Baseline@L2.0
  Format settings, CABAC           : No
  Format settings, ReFrames        : 2 frames
  Width                            : 352 pixels
  Height                           : 288 pixels
  Display aspect ratio             : 1.222
  Standard                         : PAL
  Color space                      : YUV
  Chroma subsampling               : 4:2:0
  Bit depth                        : 8 bits
  

  Why? And how to fix it?

  -r 6 -filter:v "setpts=4.166*PTS" not to offer.

  I use the Google translator.

• Writing video files with dynamic image watermarks on Android

  11 septembre 2014, par mrmoment

  I want to add dynamic watermarks (images, not texts) on video files on Android. For example, a user selects a video file on his phone, after processing, when the video is played, the watermarks are shown. And on different frames the watermark position and image is changing. Is it possible to realize this?

• Splitting video to frames using avconv/ffmpeg

  11 septembre 2014, par user44551

  Ive been trying to use ffmpeg/avconv to split a 6s video into frames every 100ms using this commands

  ffmpeg -i Video.mp4 -r 10  ./frame-%04d.png
  avconv -i Video.mp4 -r 10  ./frame-%04d.png
  

  But avconv only take 29 frames that take 4.3s (which is not the whole video and not in the desired framerate) and ffmpeg takes only 42 frames that take 4.2s (Not splitting the whole video)

  Any ideas why that could happen?

• How to Install ffmpeg on Wamp Server 2.2

  11 septembre 2014, par PreeT

  I try all the links available on the Internet for the Proper Instructions for installing ffmpeg on the wamp server 2.2

  OS is Window 7 64bit

  Please help me for installing the ffmpeg on wampserver. Php version: 5.3.13 apache: 2.2.22

  What i was trying.

  1. download http://quezar.ro/php_ffmpeg/php_ffmpeg.zip
  2. unzip
  3. move php_ffmpeg.dll to php extension dir
  4. move all other files to Windows\System32
  5. add extension=php_ffmpeg.dll to php.ini
  6. restart apache