Re: [FFmpeg-user] -b:v option

2021-04-11 Thread Moritz Barsnick 
On Thu, Apr 08, 2021 at 11:53:52 +, Mar Andrés López wrote:
> I want to do this in order to generate a DASH content, one of the
> profiles sould have the original bitrate, and the other ones fixed
> values. As an example:

Have you considered using the copy codec for the first profile? That
will guarantee the same bitrate, and not induce a loss in quality.

Cheers,
Moritz
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Re: [FFmpeg-user] -b:v option

2021-04-08 Thread Mar Andrés López 
Sorry I would have to specify a bit more.


I want to do this in order to generate a DASH content, one of the profiles 
sould have the original bitrate, and the other ones fixed values. As an example:


ffmpeg -i bunny.mp4 -preset superfast -r 25 -vcodec libx264 -acodec aac -b:a 
128k -ac 1 -ar 44100 -map v:0 -b:v:0 source -map v:0 -b:v:1 72 -map v:0 
-b:v:2 36 -map 0:a? -f dash -segment_time 5000 
C:\ComponentsDeployment\CSD_DATA\VCS\DashStreams\9780081d-c864-4420-9669-8a9feb53f4a6\manifest.mpd.


So I would have the fist profile with the original bitrate  -b:v:0 source, the 
second one with 720kbps and the third one with 360kbps.


On the other one if not posible, what happens if I set this command?


ffmpeg -i bunny.mp4 -preset superfast -r 25 -vcodec libx264 -acodec aac -b:a 
128k -ac 1 -ar 44100 -map v:0 -b:v:0 108 -map v:0 -b:v:1 72 -map v:0 
-b:v:2 36 -map 0:a? -f dash -segment_time 5000 
C:\ComponentsDeployment\CSD_DATA\VCS\DashStreams\9780081d-c864-4420-9669-8a9feb53f4a6\manifest.mpd


And bunny.mp4 has a bitrate of 795kbps, which bitrate would be displayed in 
first profile 1080kbps, does make sense or is posible to increase bitrate??


De: ffmpeg-user  en nombre de Carl Eugen Hoyos 

Enviado: jueves, 8 de abril de 2021 12:47:25
Para: FFmpeg user questions
Asunto: Re: [FFmpeg-user] -b:v option




> Am 08.04.2021 um 12:45 schrieb Mar Andrés López :
>
> Is posible to specify bitrate option -b:v as the bitrate from the input? 
> instead of doing -b:v 300k is posible for example -b:v source, which would 
> output the bitrate from original video?

No, technically this would make very little sense.

Carl Eugen
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Re: [FFmpeg-user] -b:v option

2021-04-08 Thread Carl Eugen Hoyos 



> Am 08.04.2021 um 12:45 schrieb Mar Andrés López :
> 
> Is posible to specify bitrate option -b:v as the bitrate from the input? 
> instead of doing -b:v 300k is posible for example -b:v source, which would 
> output the bitrate from original video?

No, technically this would make very little sense.

Carl Eugen 
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[FFmpeg-user] -b:v option

2021-04-08 Thread Mar Andrés López 
Dear all,


Is posible to specify bitrate option -b:v as the bitrate from the input? 
instead of doing -b:v 300k is posible for example -b:v source, which would 
output the bitrate from original video?


Aa lot of thanks.

P Please consider the environment before printing this e-mail.
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