0001384: ogg-render-profile need change - MantisBT

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ID

Project

Category

View Status

Date Submitted

Last Update

0001384

Kdenlive

Rendering

public

2010-01-16 15:13

2010-01-20 06:51

Reporter

soeren

Assigned To

Priority

normal

Severity

minor

Reproducibility

always

Status

new

Resolution

open

Platform

64 bit

OS

Sidux (Debian Sid)

OS Version

2009-4

Product Version

Recent git

Target Version

Fixed in Version

Summary

0001384: ogg-render-profile need change

Description

Kdenlive ignore parameter audio bitrate ("ab") at rendering.

I seems like, that vorbis can only use variable bitrate (meens quality) and not constant.
The audio-quality is at the moment bad (only at ogg-render).
The Problem seems, that FFMPEG use the default audio-quality ("aq") with value of 10.

I think quality of 30 would be better.
Please change this in the render-profile. Thanks :-)

Steps To Reproduce

Export/render a Video-File with one of the Ogg-Profile and listen this file.
Change the audio-bitrate parameter, export and listen this file.
The qudio-quality will be the same: A not very good audio-quality.

Additional Information

I use FFMPEG, MLT and Kdenlive from SVN

http://www.vorbis.com/faq/#quality: [^]
"For now, quality 0 is roughly equivalent to 64kbps average, 5 is roughly 160kbps, and 10 gives about 400kbps. Most people seeking very-near-CD-quality audio encode at a quality of 5 or, for lossless stereo coupling, 6. The default setting is quality 3, which at approximately 110kbps gives a smaller filesize and significantly better fidelity than .mp3 compression at 128kbps."

Tags

No tags attached.

Build/Install Method

Manual build from SVN

Relationships

Notes
(0004527) j-b-m (administrator) 2010-01-19 00:34	Ok, I updated the theora profiles so that profiles > 800k now have the aq=30 parameter.

(0004530) soeren (reporter) 2010-01-19 04:53 edited on: 2010-01-19 04:56	Thanks - but, oh - sorry - i think i've report to early. Now i tested some more with ffmpeg. I find a easier way to fix this: Just change from "vorbis" to "libvorbis", then it's take the audio-bitrate.

(0004538) ddennedy (developer) 2010-01-20 06:49 edited on: 2010-01-20 06:50	The reason it is "vorbis" is for when ffmpeg is not configured with libvorbis. We have code in Kdenlive that says "if 'vorbis' is not available but 'libvorbis' is then use 'libvorbis'." I guess we need to invert this logic and put libvorbis into the profile. However, what do we do with ab and aq options depending on which codec is used? Will it be ok with either codec if we set both ab and aq options? soeren, we would appreciate your help if you can make that experiment since you are already familiar with how to test the results.

Issue History
Date Modified	Username	Field	Change
2010-01-16 15:13	soeren	New Issue
2010-01-19 00:34	j-b-m	Note Added: 0004527
2010-01-19 00:34	j-b-m	Status	new => feedback
2010-01-19 04:53	soeren	Note Added: 0004530
2010-01-19 04:53	soeren	Status	feedback => new
2010-01-19 04:56	soeren	Note Edited: 0004530	View Revisions
2010-01-20 06:49	ddennedy	Note Added: 0004538
2010-01-20 06:50	ddennedy	Note Edited: 0004538	View Revisions

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