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

[Yuntaek Lim]

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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