Is there a way to know in advance the output file size? This would be very helpful.

(Great software, by the way, so thanks to all!)

fannystrubin wrote:Is there a way to know in advance the output file size? This would be very helpful.

(Great software, by the way, so thanks to all!)

Google is your friend: https://toolstud.io/video/filesize.php

Thanks for https://toolstud.io/video/filesize.php. It's a good site.

The trouble is, kdenlive doesn't seem to show or have a settable bitrate.

It says on the render screen:

f=mp4 movflags=+faststart vcodec=libx264 progressive=1 g=15 bf=2 crf=%quality acodec=aac ab=%audiobitrate+'k'

Help?

You can create a new render profile and provide the vb parameter. There is a link to the MLT parameter documentation in the profile creation dialog window. Make yourself familiar with the parameters and what they do and then add them to the profile. Give it a good name and description and save it. Then use that profile for your renders. I suggest you copy the profile you normally use and tweak it to your requirements.

berndmj wrote:You can create a new render profile and provide the vb parameter. There is a link to the MLT parameter documentation in the profile creation dialog window. Make yourself familiar with the parameters and what they do and then add them to the profile. Give it a good name and description and save it. Then use that profile for your renders. I suggest you copy the profile you normally use and tweak it to your requirements.

Ah, good. I feel progress.

Okay, this is the preset I normally use:

f=mp4 movflags=+faststart vcodec=libx264 progressive=1 g=15 bf=2 crf=%quality acodec=aac ab=%audiobitrate+'k'

MLT parameter documentation https://www.mltframework.org/plugins/ConsumerAvformat/ baffles me, but I think I know to add vb=1000 or something. I tried that, but when changing the video quality from the default "23", the bitrate changes anyhow. If I could lock in that darn bitrate, that would be helpful.

If you care why I'm doing this: I make videos that must be max 24MB. So, if one is 3 min or 2 min, I wish to control the video bitrate to make the output 24MB with highest bitrate possible.

And why on Earth is quality 15 better than quality 45? That seems backwards.

Many thanks!

fannystrubin wrote:MLT parameter documentation https://www.mltframework.org/plugins/ConsumerAvformat/ baffles me, but I think I know to add vb=1000 or something. I tried that, but when changing the video quality from the default "23", the bitrate changes anyhow. If I could lock in that darn bitrate, that would be helpful.

You need to replace

Code: Select all

crf=%quality

with

Code: Select all

vb=1000

fannystrubin wrote:And why on Earth is quality 15 better than quality 45? That seems backwards.

This has been complained about many times already. Dunno why it was conceived that way in the first place but that's the way it is. I normally leave it at the default as it produces high enough quality for my purposes.

berndmj wrote:

fannystrubin wrote:MLT parameter documentation https://www.mltframework.org/plugins/ConsumerAvformat/ baffles me, but I think I know to add vb=1000 or something. I tried that, but when changing the video quality from the default "23", the bitrate changes anyhow. If I could lock in that darn bitrate, that would be helpful.

You need to replace

Code: Select all

crf=%quality

with

Code: Select all

vb=1000

fannystrubin wrote:And why on Earth is quality 15 better than quality 45? That seems backwards.

This has been complained about many times already. Dunno why it was conceived that way in the first place but that's the way it is. I normally leave it at the default as it produces high enough quality for my purposes.

Yay!! Thank you so much!!

berndmj wrote:

fannystrubin wrote:MLT parameter documentation https://www.mltframework.org/plugins/ConsumerAvformat/ baffles me, but I think I know to add vb=1000 or something. I tried that, but when changing the video quality from the default "23", the bitrate changes anyhow. If I could lock in that darn bitrate, that would be helpful.

You need to replace

Code: Select all

crf=%quality

with

Code: Select all

vb=1000

fannystrubin wrote:And why on Earth is quality 15 better than quality 45? That seems backwards.

This has been complained about many times already. Dunno why it was conceived that way in the first place but that's the way it is. I normally leave it at the default as it produces high enough quality for my purposes.

Oh well. I changed it to this and it made the video good but sound all weak.

f=mp4 movflags=+faststart vcodec=libx264 progressive=1 g=15 bf=2 vb=1000000 acodec=aac ab=%audiobitrate+'k'

It also blacked out the video and audio quality option leaving the audio quality at 7 for some reaosn.

fannystrubin wrote:f=mp4 movflags=+faststart vcodec=libx264 progressive=1 g=15 bf=2 vb=1000000 acodec=aac ab=%audiobitrate+'k'

Why don't you replace ab+%audiobitrate+'k' with whatever audio bitrate (e.g 192kb) you want?

berndmj wrote:

fannystrubin wrote:f=mp4 movflags=+faststart vcodec=libx264 progressive=1 g=15 bf=2 vb=1000000 acodec=aac ab=%audiobitrate+'k'

Why don't you replace ab+%audiobitrate+'k' with whatever audio bitrate (e.g 192kb) you want?

It worked perfectly! Thank you so much. You are a genius!

fannystrubin wrote:You are a genius!

Not so sure about that, but nonetheless glad I could help