Setting a new playback speed without file re-encoding?

Honeyko · 25th December 2020, 07:45

I enjoy listening to podcasts and livestreams, many of which are multi-hour. On YouTube, I can set playback speed to x1.25 or x1.5, and save a fair bit of time.

Q. Is there a way to easily do this with an already saved, stream-copied, or re-muxed file (e.g., in the likes of MKVToolNix) *without* re-encoding the whole bloody thing, or making everyone sound like a chipmunk?

I am not looking for a player that will do it; I wish to modify the file itself, so it will always play at the new speed.

TIA.

jlw_4049 · 25th December 2020, 07:50

I honestly doubt it without encoding the file again, I however could be wrong.

Sent from my SM-G986U1 using Tapatalk

Honeyko · 25th December 2020, 08:05

How do YouTube, Rumble, and BitChute do it on-the-fly during playback, *with* built-in pitch-correction? My assumption is they're pitch-correcting the audio track in real-time while merely dragging or speeding FPS all other tracks in the playing file, including subtitles.

If there were a capture utility that could snag a file from one of those sites off a dropped URL, with user-selected playback settings applied, that would be one solution, albeit a source-specific one.

Selur · 31st December 2020, 13:19

Have you tried MPC-HC (make sure to set 'Options->Playback->Output->Audio Renderer' to 'Internal Audio Renderer' before changing 'Play->Playback Rate') ?

Cu Selur

ReinerSchweinlin · 10th January 2021, 21:09

Selurs Solution works. Many other Players could do this, too. I remember Power DVD having the same feature, mplayer hat it, too...

If you want to do this permanently without re-encoging the video - you could remux it to a new container, give the videostream a new framerate and recode the audio to the new lenght (hybrid, besweet, etc.... lots of tools for this around) and mux the new audio back in... Should be quite fast, no re-encoding needed...

in some containers, you could actually just change the playback speed in the header (at least for audio)..

25th December 2020, 07:45	#1 \| Link
Honeyko Registered User Join Date: Oct 2007 Posts: 313	Setting a new playback speed without file re-encoding? I enjoy listening to podcasts and livestreams, many of which are multi-hour. On YouTube, I can set playback speed to x1.25 or x1.5, and save a fair bit of time. Q. Is there a way to easily do this with an already saved, stream-copied, or re-muxed file (e.g., in the likes of MKVToolNix) without re-encoding the whole bloody thing, or making everyone sound like a chipmunk? I am not looking for a player that will do it; I wish to modify the file itself, so it will always play at the new speed. TIA.

25th December 2020, 07:50	#2 \| Link
jlw_4049 Registered User Join Date: Sep 2018 Posts: 389	I honestly doubt it without encoding the file again, I however could be wrong. Sent from my SM-G986U1 using Tapatalk __________________ FFMPEG Audio Encoder Youtube-DL-GUI

25th December 2020, 08:05	#3 \| Link
Honeyko Registered User Join Date: Oct 2007 Posts: 313	How do YouTube, Rumble, and BitChute do it on-the-fly during playback, with built-in pitch-correction? My assumption is they're pitch-correcting the audio track in real-time while merely dragging or speeding FPS all other tracks in the playing file, including subtitles. If there were a capture utility that could snag a file from one of those sites off a dropped URL, with user-selected playback settings applied, that would be one solution, albeit a source-specific one. Last edited by Honeyko; 25th December 2020 at 08:09.

31st December 2020, 13:19	#4 \| Link
Selur Registered User Join Date: Oct 2001 Location: Germany Posts: 7,086	Have you tried MPC-HC (make sure to set 'Options->Playback->Output->Audio Renderer' to 'Internal Audio Renderer' before changing 'Play->Playback Rate') ? Cu Selur __________________ Hybrid here in the forum, homepage

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10th January 2021, 21:09	#5 \| Link
ReinerSchweinlin Registered User Join Date: Oct 2001 Posts: 442	Selurs Solution works. Many other Players could do this, too. I remember Power DVD having the same feature, mplayer hat it, too... If you want to do this permanently without re-encoging the video - you could remux it to a new container, give the videostream a new framerate and recode the audio to the new lenght (hybrid, besweet, etc.... lots of tools for this around) and mux the new audio back in... Should be quite fast, no re-encoding needed... in some containers, you could actually just change the playback speed in the header (at least for audio)..