View source for Compensate for PAL Speedup in Digital Video

If you are not familiar with [[PAL Speedup]] then you should [[PAL Speedup|read about it]] to understand the problem and implications of how it adversely impacts digital video.

It is best to encode in the correct framerate.  25 FPS Telecine video mastered from film or NTSC source is bad.  Delete it when you come across it.  If the video you are looking for is remastered with 25 FPS Telecine, suffering from PAL Speedup, and no other video source is available, you can use one of various methods to compensate for the distortion during playback.

== Play PAL movies at correct speed ==

===VLC===
* SOLUTION FOUND AND VERIFIED
This guide comes from Mac OS Hints on the Macworld web site and applies to [[VideoLAN Player]] on Windows, MAC, and Linux.  The article in the Macworld forum is [http://hints.macworld.com/article.php?story=20100911194206308 Play PAL movies at correct speed in VLC].

In Video LAN Player / VLC Player do the following:
#Go to the 'VLC' menu and select 'Preferences…'
#In the radio buttons in the lower-left corner of the window, change 'Basic' to 'All'.
#Click on 'Input / Codecs' in the left-hand side list.
#In the right-hand side frame look for 'Playback speed' and change it to 0.96.
#Click on 'Audio' in the left-hand side list.
#In the right-hand side frame disable 'Enable time stretching audio'.
#Click the 'Save' button on the lower-right corner of the window.
#Restart VLC.

Adjusting playback speed of PAL video to 0.96 in VLC player preferences to compensate for PAL speedup works very well during VLC playback, and using the record function during the playback creates a VLC video clip file which properly shows the added length of the clip due to the speed change.  However, the speed adjustment is not retained in the new video clip created by VLC, therefore, this is not a good method of remastering the video (don't waste your time.)  Just use this method for viewing the PAL video.

* Make sure to set the Playback speed to 1.00 when watching NTSC encoded movies!

command line
 vlc -f videofilename.avi --no-audio-time-stretch --rate=0.96

===mplayer===
*PARTIAL SOLUTION
To just slow it down 4%
 mplayer dvd://1 -speed 96/100

Keep tempo, change pitch. Use [ ] keys to change pitch
 mplayer file.mp3 -af scaletempo=scale=1.0:speed=pitch

* ''the temp adjustment necessary or if necessary is unknown at this time!''

===smplayer===
Now smplayer might be using either mplayer or mpv as the backend video player...

===mpv===
* SOLUTION FOUND AND VERIFIED
working with something like this....
 mpv --af=scaletempo --speed=.96 videofilename.avi

===FFmpeg===
Goal of slowing down the video to the desired frame rate of 23.976 fps.

== Using ReClock to correct for PAL Speedup ==

The original purpose of Reclock, which is a Directshow Filter, is to allow for smooth playback on a PC video monitor for video from other sources.  It turns out that ReClock is also excellent for reversing the PAL Speedup effect.  It will also allow you to reverse PAL Speedup.  Reclock is described as a DirectShow filter which is loaded in place of the default directsound audio renderer. 

Older versions of ReClock do not include this very useful feature.  Version 1.8.8.4 will include the feature.  '''ReClock is only for Microsoft Windows.'''  ReClock will not only stretch the video to the correct length, it will also fix the audio pitch problem associated with PAL Speedup.  ReClock is also known by the full name: ReClock DirectShow Filter.

==Discussion of reversing PAL speedup==

{{:Discussion of reversing PAL speedup}}













[[Category:Computer_Technology]]
[[Category:Software]]
[[Category:Digital Video]]
[[Category:Desktop Software]]
[[Category:Video Tools]]