[FFmpeg-user] Fast Conversion with compressed size and maintain Quality

[AMIT KUMAR]

Hi,
I am using your command line which one you give but it takes 4 min time and
the file size becomes 320 MB.Whereas i am changing the crf value but quality
is not maintain. So, can you help me the other one command line to fast and
maintain quality.

On Wed, Feb 13, 2019 at 5:30 AM Yuntaek Lim <yuntaek.lim at gmail.com> wrote:

> Hi Amit,
>
> Do you have expected the minimum rate of reducing filesize and processing
> time?
> If you want maintain the quality, use low value of "crf" such as 18 to 20.
> The preset "ultrafast" provide fast encoding but lower compression rate.
> I suggest you decided the target filesize and the processing time. Then,
> you try to find the value of "crf" and the value of "preset" which
> satisfying you.
>  "-i 503148_inn.mp4 -codec:a copy -preset ultrafast -vcodec h264 -crf 20
> 503148.mp4"
> Preset values are listed on "https://trac.ffmpeg.org/wiki/Encode/H.264".
>
> Regards,
>
>
>
>
> 2019년 2월 13일 (수) 오전 3:29에 AMIT KUMAR <amitksoft8 at gmail.com>님이 작성:
>
> > Yes i have the original source file which is in .webm and then i  am
> using
> > 503148.webm -preset ultrafast -max_muxing_queue_size 999999
> 503148_inn.mp4
> > After that mute video extracting audio and merge that audio file in one
> > that i have a audio file then we merge the audio and video then it
> creates
> > 503148_inn.mp4 which one i shared through link.
> > Then i need to compress, maintain quality and do that process fast.
> >
> >
> > On Tue, 12 Feb 2019 11:48 pm Ted Park <kumowoon1025 at gmail.com wrote:
> >
> > > Try to find the original source, I’m positive you are trying to work
> with
> > > a stream with many, many duplicated frames.
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