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• 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)

• ffmpeg linux command line conversion a folder with FLAC files in them to MP3 (v0 LAME quality) in another directory, not deleting the original FLACs [on hold]

  3 septembre 2017, par LT.Smash

  Maybe with the new folder is inside the original folder with the FLAC files, creating a directory named like the one with the flac files, except with (v0) at the end. It would be very useful for stuff that is on a VPS of mine without having to download the stuff home, use a gui application re-upload etc. I’m used to do some straightforward command line ffmpeg conversion for videos, but as you can see this is audio with many paramaters and I can’t get it to work and what I find here is great, but is only parts of what I’m looking for and also many seem to convert the flac files themselves, so they disappear and the mp3 remains.

• configure : Restore original endianness test

  8 mars 2018, par Diego Biurrun

  configure : Restore original endianness test
  Previously the bit pattern for the endianness test was declared as a
  
  global, instead of a local, variable. This ensures that the pattern
  
  appears unchanged in the object file and is not optimized out.
  

  • [DBH] configure