I have these very small mp4 files, that have a good quality and they are
for advertisement. frames change rarely in these videos and I need to
encode some advertisement videos like these. for example this one is about
11 seconds and is 620kb. this is what I am looking forward to do.
mp4box group has said that gop length has to be fixed and the same lengh
for input videos, otherwise the dash video will not play well.
> Do the tutorials also explain why you would ever want to use a braindead
> (!) fixed gop size in the first place?
>
> I could imagine a requirement for a
I have two videos that I encoded them with ffmpeg, like:
ffmpeg -i 1_med.mp4 -movflags faststart -c:v libx264 -x264opts
'keyint=100:min-keyint=25:no-scenecut:8x8dct:sliced-threads=0' -deblock 1:1
-flags +loop -b:v 850k -maxrate 850k -bufsize 2000k -nal-hrd cbr -vf
I have encoded myu videos using ffmpeg with this command:
ffmpeg -i input.mp4 -movflags faststart -c:v libx264 -x264opts
'keyint=100:min-keyint=25:no-scenecut:8x8dct:sliced-threads=0' -deblock 1:1
-flags +loop -b:v 850k -maxrate 850k -bufsize 2000k -nal-hrd cbr -vf
after adding what you suggested, it seems that the bitrate has been equal
to what I specified.
mediainfo shows this:
Bit rate mode: Constant
Bit rate : 850 Kbps / 850 Kbps
is this ok??
> Furthermore (let me google that for you:
>
I am using this command to transcode my videos in ffmpeg:
ffmpeg -i 1_med.mp4 -movflags faststart -c:v libx264 -x264opts
'keyint=100:min-keyint=25:no-scenecut:8x8dct:sliced-threads=0' -deblock 1:1
-flags +loop -b:v 850k -maxrate 850k -bufsize 2000k -vf
>
>
> And you wonder why the encoder can't lower quality enough to stay within
> the buffer you set?
>
I set this to 69 and the problem is solved. thanks
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I am using this commad to transcode a video with 12000k bitrate to a lower
bitrate like 300k.
here is my command:
ffmpeg -i 12000.mp4 -movflags faststart -c:v libx264 -x264opts
'keyint=288:min-keyint=24:8x8dct:sliced-threads=0' -deblock 1:1 -flags
+loop -b:v 300k -maxrate 300k -bufsize 1000k
: English
On Sun, Apr 9, 2017 at 12:56 PM, negin tebyani <negin.teby...@gmail.com>
wrote:
> I am using this commad to transcode a video with 12000k bitrate to a lower
> bitrate like 300k.
>
> here is my command:
>
> ffmpeg -i 12000.mp4 -movflags faststart -c:v libx264 -x2
>
> Could you reencode that better quality sample to include initial intro
> from source you provided?
>
>
reencode it with my own setting?
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To
I found that source file have many compression artifacts... i put some
> nasty filter and tune options a bit. Not good yet, but is a bit better?
thank you, I tried you command but the quality is still lower than the
other one..
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sorry, I forgot to paste the command:
ffmpeg -i arsenalVScristalPalas.mp4 -movflags faststart -c:v libx264
-x264opts 'keyint=300:min-keyint=25:8x8dct:sliced-threads=0' -qblur 0.5
-deblock 1:1 -flags +loop -b:v 2048k -maxrate 2048k -bufsize 5000k -vf
> you where requested to copy that into your response mail - not more
> and not less
>
>
ok, here is the output:
ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg
developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
configuration: --prefix=/usr
>
> Well ignoring requests for ffmpeg console output and a section
> of the master that the provided samples were made from means
> that less people will even try to help you.
>
>
I don'n know how to reach for ffmpeg output console, but here is a section
of the master video:
unfortunately this does not make differences in results either:
Then i can think only about that:
>
> ffmpeg -y -i in.mp4 -an -c:v libx264 -preset veryslow -b:v 2048k -refs 8
> -qcomp 0.7 -nr 40 -flags +loop -deblock 1:0 -pass 1 /dev/null
> ffmpeg -y -i in.mp4 -c:a aac -b:a 128k -c:v libx264
>
> Was the "good" sample coded from this?
>
yes it was encoded from this video.
>
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The problem is that when I pause both videos at the same scene, the other
video is so smooth and you can't see any noise, but mine is not like that.
It seems they have used some video filter or something to Remove the noise.
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this is the source video mediainfo:
General
Complete name: arsenalVScristalPalas.mp4
Format : MPEG-4
Format profile : JVT
Codec ID : avc1 (avc1/mp42)
File size
sometimes better is using crf than constant bitrate (use
> something like -crf 22 instead with single pass) you could
> unsharp=7:7:0.5:7:7:0.5 before scale and if you compile ffmpeg try with
> -fno-fast-math
>
>
> W dniu 2017-03-27 o 14:21, negin tebyani pisze:
>
>> I hav
I have encoded my videos using ffmpeg and H264, and this is my ffmpeg
command (2 pass encoding):
ffmpeg -y -i Edited\ Clips/arsenalVScristalPalas.mp4 -movflags faststart
-c:v libx264 -x264opts
'keyint=300:min-keyint=25:8x8dct:sliced-threads=0:subq=6' -deblock 0:0
-flags +loop -preset slow -tune
I have used ffmpeg and mp4box to create a non-adaptive mpeg-dash, and I am
doing it by using only one bitrate in each video (its just a test). here is
my demo link. my video has a delay about 15 seconds and its so bad for my
purpose. why am I having this delay?? is it a buffering problem?? I would
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