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• ffmpeg add text with fade in effect

  1er octobre 2017, par levi

  I am trying to create a simple music video with a single image background and the lyrics showing up in a fade in and fade out effect during the video.

  Like stuff done with After Effects. Can a quality fade in and fade out be done with ffmpeg ?

  What would be the command to call when trying to achieve a simple text fading in the middle of the video at about 10s, fading out at 15s and then the next one ? etc...

  If possible please include a solution with background image.

• avformat/avio : clarify that AVSEEK_FORCE has no effect

  4 août, par Valerii Zapodovnikov

  avformat/avio : clarify that AVSEEK_FORCE has no effect
  avio_seek() never supported SEEK_END and returned AVERROR(EINVAL) when
  
  specified, so the later check "(whence != SEEK_END || force)" was always true.
  This also means that AVSEEK_FORCE had no effect since 7a6fe01f99, that is 15
  
  years ago. Rather than changing behaviour, let's document instead that the flag
  
  has no effect.
  Also fixed other commit 41ed7ab45f which confused ORing / passing AVSEEK_FORCE
  
  and AVSEEK_SIZE in the docs.
  Signed-off-by : Valerii Zapodovnikov <val.zapod.vz@gmail.com>
  

  • [DH] libavformat/avio.h
  • [DH] libavformat/aviobuf.c

• FFMPEG drops supposedly corrupt frames from original video while transcoding using h264 encoder

  19 février 2019, par t6nand

  I am using h264 for optimising MP4 for web. I have a video which has some supposedly corrupt frame(s) within it’s initial 1-2 seconds. (Frame provided below)

  On transcoding using :

  ffmpeg -i orig.mp4 -c:v libx264 -crf 25 -vf scale="-2:min(ih\,720)" -b:v 600K -g 90 -c:a libfdk_aac output.mp4

  The output MP4 has these frames dropped out and I have my output with it’s start about 1 to 2 seconds delayed from original video, thus resulting in overall less time duration in output video.

  Moreover, most media players also skip these frames in playback (like quicktime player, etc). But VLC media player was able to play this video without skipping these frames.

  Is there a way to not drop frames using ffmpeg ? And if possible is it possible to identify and fix these frames in a video ?

  Note : I tried encoding same video using AWS Elastic transcoder which actually fixed these frames (Frame provided below) :
  

  Note : Original video can be found here -
  https://drive.google.com/file/d/0B9VkhR9Zu60ybXFDeno3RGpQTUE/view?usp=sharing
  Video transcoded by AWS Elsatic transcoder can be found here -
  https://drive.google.com/file/d/0B9VkhR9Zu60yWUVHQk5MTk05QVk/view?usp=sharing

  EDIT1 : As suggested by @Mulvya in comments, TS-transcoded video can be found here - (https://drive.google.com/file/d/0B9VkhR9Zu60yU0t6T0dMME9ZMmc/view?usp=sharing)