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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|
|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|
"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|
|Ok, I updated the theora profiles so that profiles > 800k now have the aq=30 parameter.|
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.
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.
|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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