fps needed in 1st pass in x264?

Forteen88 · 8th September 2009, 15:40

Hey,
Is --fps value needed in 1st pass in x264, or is setting it in 2nd pass enough? I've encoded 1st pass for 30h, and don't want to restart encoding :-P Although setting fps in mkvmerge is maybe the same?
Thanks

rack04 · 8th September 2009, 15:45

Quote:

Originally Posted by Forteen88

Hey,
Is --fps value needed in 1st pass in x264, or is setting it in 2nd pass enough? I've encoded 1st pass for 30h, and don't want to restart encoding :-P Although setting fps in mkvmerge is maybe the same?
Thanks

First, what is your reasoning for setting the --fps value to begin with?

PiPPoNe92 · 8th September 2009, 15:53

There isn't need to write fps, in fact x264 impost 25.00 fps in automatic in the 1st and in the 2nd pass

buzzqw · 8th September 2009, 15:54

afaik --fps is needed only with pipe input

BHH

LoRd_MuldeR · 8th September 2009, 16:06

I'd assume that the correct "--fps" is needed for all bitrate-based modes and for both passes, because bitrate per second highly depends on how many frames per second we have.

But as buzzqw said, you usually don't need to set the "--fps" parameter manually, unless you use pipe input. x264 reads the correct FPS from your source Avisynth script...

Forteen88 · 8th September 2009, 16:09

Ok, thanks. Source is 25 fps (mkvmerge complained last time when I didn't set --fps 25 on a 25fps-source-encode, but that might've been because I changed SAR also).

buzzqw · 8th September 2009, 16:11

more generalized: --fps is to use for any raw source

BHH

8th September 2009, 15:40	#1 \| Link
Forteen88 Herr Join Date: Apr 2009 Location: North Europe Posts: 556	fps needed in 1st pass in x264? Hey, Is --fps value needed in 1st pass in x264, or is setting it in 2nd pass enough? I've encoded 1st pass for 30h, and don't want to restart encoding :-P Although setting fps in mkvmerge is maybe the same? Thanks

8th September 2009, 15:54	#4 \| Link
buzzqw HDConvertToX author Join Date: Nov 2003 Location: Cesena,Italy Posts: 6,552	afaik --fps is needed only with pipe input BHH __________________ HDConvertToX: your tool for BD backup MultiX264: The quick gui for x264 AutoMen: The Mencoder GUI AutoWebM: supporting WebM/VP8

8th September 2009, 16:06	#5 \| Link
LoRd_MuldeR Software Developer Join Date: Jun 2005 Location: Last House on Slunk Street Posts: 13,248	I'd assume that the correct "--fps" is needed for all bitrate-based modes and for both passes, because bitrate per second highly depends on how many frames per second we have. But as buzzqw said, you usually don't need to set the "--fps" parameter manually, unless you use pipe input. x264 reads the correct FPS from your source Avisynth script... __________________ Go to https://standforukraine.com/ to find legitimate Ukrainian Charities 🇺🇦✊

8th September 2009, 16:09	#6 \| Link
Forteen88 Herr Join Date: Apr 2009 Location: North Europe Posts: 556	Ok, thanks. Source is 25 fps (mkvmerge complained last time when I didn't set --fps 25 on a 25fps-source-encode, but that might've been because I changed SAR also). Last edited by Forteen88; 8th September 2009 at 16:12.

8th September 2009, 16:11	#7 \| Link
buzzqw HDConvertToX author Join Date: Nov 2003 Location: Cesena,Italy Posts: 6,552	more generalized: --fps is to use for any raw source BHH __________________ HDConvertToX: your tool for BD backup MultiX264: The quick gui for x264 AutoMen: The Mencoder GUI AutoWebM: supporting WebM/VP8

8th September 2009, 15:53	#3 \| Link
PiPPoNe92 Registered User Join Date: Aug 2009 Location: Italy Posts: 98	There isn't need to write fps, in fact x264 impost 25.00 fps in automatic in the 1st and in the 2nd pass