4K Compression using x.265 issues

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4K Compression using x.265 issues

Ron Barnes
All,

For some reason the below command is not working right.  I am unable to compress my movie by an significant amount.
The input movie (MYMOVIE.Mkv) is just over 55GB and the resulting output is just over 53GB.

I thought (and I am probably wrong) that by raising or lowering the -crf value would increase or decrease the size of my output file.  No matter what value I use, be it 18 or 28, the output file size is always the same.

Can anyone determine where I'm going south in order to decrease the files's footprint (size) yet still preserve the movie quality?

I want to take all the audio streams (only audio) and I am converting them to mp3 because I do not have a very good sound system and the actual 7.1 audio stream sounds awful.

ffmpeg -i "MYMOVIE.Mkv" -c:v libx265 -preset medium -map 0 -c:a:0 libmp3lame -b:a:0 128k -c copy -reserve_index_space 1000k -crf 28 -s 3840x2160 -b:v 10M -ac 2 -c:a aac -b:a 128k -metadata title="MYMOVIE" COMPRESSED_MYMOVIE.mkv

Thank you,

-Ron

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Re: 4K Compression using x.265 issues

Kieran O Leary
On Fri, 16 Nov 2018, 12:00 Ron Barnes <[hidden email] wrote:

> All,
>
> For some reason the below command is not working right.  I am unable to
> compress my movie by an significant amount.
> The input movie (MYMOVIE.Mkv) is just over 55GB and the resulting output
> is just over 53GB.
>
> I thought (and I am probably wrong) that by raising or lowering the -crf
> value would increase or decrease the size of my output file.  No matter
> what value I use, be it 18 or 28, the output file size is always the same.
>
> Can anyone determine where I'm going south in order to decrease the
> files's footprint (size) yet still preserve the movie quality


Yes,you are manually setting the bitrate with your  -b:v 10M command.
Remove that and try again.

Best,

Kieran
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Re: 4K Compression using x.265 issues

Paul B Mahol
In reply to this post by Ron Barnes
On 11/16/18, Ron Barnes <[hidden email]> wrote:

> All,
>
> For some reason the below command is not working right.  I am unable to
> compress my movie by an significant amount.
> The input movie (MYMOVIE.Mkv) is just over 55GB and the resulting output is
> just over 53GB.
>
> I thought (and I am probably wrong) that by raising or lowering the -crf
> value would increase or decrease the size of my output file.  No matter what
> value I use, be it 18 or 28, the output file size is always the same.
>
> Can anyone determine where I'm going south in order to decrease the files's
> footprint (size) yet still preserve the movie quality?
>
> I want to take all the audio streams (only audio) and I am converting them
> to mp3 because I do not have a very good sound system and the actual 7.1
> audio stream sounds awful.
>
> ffmpeg -i "MYMOVIE.Mkv" -c:v libx265 -preset medium -map 0 -c:a:0 libmp3lame
> -b:a:0 128k -c copy -reserve_index_space 1000k -crf 28 -s 3840x2160 -b:v 10M
> -ac 2 -c:a aac -b:a 128k -metadata title="MYMOVIE" COMPRESSED_MYMOVIE.mkv

Remove: -c copy.
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Re: 4K Compression using x.265 issues

Ron Barnes
Hi,

When I remove the -c copy - get an error.. subtitle encoding currently only possible from text to text or bitmap to bitmap.. then it just ends.

Any way to preserve the subtitles?

-Ron

-----Original Message-----
From: ffmpeg-user <[hidden email]> On Behalf Of Paul B Mahol
Sent: Friday, November 16, 2018 9:02 AM
To: FFmpeg user questions <[hidden email]>
Subject: Re: [FFmpeg-user] 4K Compression using x.265 issues

On 11/16/18, Ron Barnes <[hidden email]> wrote:

> All,
>
> For some reason the below command is not working right.  I am unable
> to compress my movie by an significant amount.
> The input movie (MYMOVIE.Mkv) is just over 55GB and the resulting
> output is just over 53GB.
>
> I thought (and I am probably wrong) that by raising or lowering the
> -crf value would increase or decrease the size of my output file.  No
> matter what value I use, be it 18 or 28, the output file size is always the same.
>
> Can anyone determine where I'm going south in order to decrease the
> files's footprint (size) yet still preserve the movie quality?
>
> I want to take all the audio streams (only audio) and I am converting
> them to mp3 because I do not have a very good sound system and the
> actual 7.1 audio stream sounds awful.
>
> ffmpeg -i "MYMOVIE.Mkv" -c:v libx265 -preset medium -map 0 -c:a:0
> libmp3lame
> -b:a:0 128k -c copy -reserve_index_space 1000k -crf 28 -s 3840x2160
> -b:v 10M -ac 2 -c:a aac -b:a 128k -metadata title="MYMOVIE"
> COMPRESSED_MYMOVIE.mkv

Remove: -c copy.
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Re: 4K Compression using x.265 issues

Paul B Mahol
On 11/16/18, Ron Barnes <[hidden email]> wrote:
> Hi,
>
> When I remove the -c copy - get an error.. subtitle encoding currently only
> possible from text to text or bitmap to bitmap.. then it just ends.
>
> Any way to preserve the subtitles?
>

Yes, use -c:s copy
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Re: 4K Compression using x.265 issues

Ron Barnes
Thank you!

-----Original Message-----
From: ffmpeg-user <[hidden email]> On Behalf Of Paul B Mahol
Sent: Friday, November 16, 2018 12:05 PM
To: FFmpeg user questions <[hidden email]>
Subject: Re: [FFmpeg-user] 4K Compression using x.265 issues

On 11/16/18, Ron Barnes <[hidden email]> wrote:
> Hi,
>
> When I remove the -c copy - get an error.. subtitle encoding currently
> only possible from text to text or bitmap to bitmap.. then it just ends.
>
> Any way to preserve the subtitles?
>

Yes, use -c:s copy
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