[FFmpeg-user] 4K Compression using x.265 issues

[Kieran O Leary]

On Thu, 15 Nov 2018, 16:36 Ron Barnes <rbarnes at njdevils.net wrote:

> Hi Kieran,
>
> I was able to compress the file from 80GB to 27GB but I'm still having
> major buffering issues.  Would the commands below be the same for an MP4
> output?  I have had better luck using MP4 instead of MKV.
>

You could replace the reserve_index_space 50k command with
-movflags +fast start

If using MP4 or mov.

Best,

Kieran



> Thanks,
> -Ron
>
> -----Original Message-----
> From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> On Behalf Of Kieran O
> Leary
> Sent: Thursday, November 15, 2018 8:34 AM
> To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
> Subject: Re: [FFmpeg-user] 4K Compression using x.265 issues
>
> I should have proof-read better. I have many typos in here, but the worse
> is my broken command where I said -ar 2 instead of -ac 2
>
> Also I meant to say that I wasn't sure if downsampling will increase the
> volume levels, as I don't know enough about audio .
>
>  So overall, your command would be something like (i haven't tested this):
> ffmpeg -i "YDXJ0085.MP4" -c:v libx265 -preset medium -map 0
> -reserve_index_space 50k -crf 22 -s 3840x2160 -b:v 10M -ac 2 -c:a aac -b:a
> 128k -metadata title="Juliana - Disney 8-12-2018"
> Disney_Vac_1.mkv
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