Re: [FFmpeg-user] output bitrate equal to expected bitrate

2017-04-16 Thread Moritz Barsnick 
On Sat, Apr 15, 2017 at 10:34:33 +0430, negin tebyani wrote:
> mediainfo shows this:
> Bit rate mode: Constant
> Bit rate : 850 Kbps / 850 Kbps
> is this ok??

Are you asking us? You were the one requesting that mediainfo should
report this. I don't understand what you are actually trying to
achieve, and you didn't answer Carl's and my questions regarding why
you want this.

Note that neither ffprobe nor mediainfo are "conformance" testers, and
they won't tell you whether the actual bitrate throughout is within the
constraints given by you. (You might be able to calculate that from
ffprobe.)

Moritz
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Re: [FFmpeg-user] output bitrate equal to expected bitrate

2017-04-15 Thread negin tebyani 
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:
> https://forum.doom9.org/showthread.php?p=1478388#post1478388), you can
> add the x264 option
>
> nal-hrd=cbr
>
>
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Re: [FFmpeg-user] output bitrate equal to expected bitrate

2017-04-13 Thread Carl Eugen Hoyos 
2017-04-13 15:25 GMT+02:00 negin tebyani :

> I need the bitrate to be constant

Do you know what constant bitrate means?
(The answer is not trivial and it - of course - does
not mean constant frame size)
If not, your question makes no sense.

Since you are encoding with x264, we may be able
to answer (some) questions, but even if there is an
issue, we will not be able to fix it.

Carl Eugen
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Re: [FFmpeg-user] output bitrate equal to expected bitrate

2017-04-13 Thread Moritz Barsnick 
On Thu, Apr 13, 2017 at 17:55:37 +0430, negin tebyani wrote:
> I need the bitrate to be constant and equal to the one specified (-b:v).

Is there a technical reason for this?

Anyway, it seems libx264 has issues achieving your desired bitrate - it
doesn't have enough information.

For more precise bitrate, try two-pass encoding: Add "-pass 1" first
time round, "-pass 2" second time.

Furthermore (let me google that for you:
https://forum.doom9.org/showthread.php?p=1478388#post1478388), you can
add the x264 option

nal-hrd=cbr

Note that (I believe) libx264 will pad the bitstream to achieve the
desired bitrate, without adding actual information. Yet mediainfo
reports exact bitrate and CBR, if that's your desire. (I tried it, it
works.)

Moritz
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[FFmpeg-user] output bitrate equal to expected bitrate

2017-04-13 Thread negin tebyani 
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
"scale=-1280:720:flags=spline+full_chroma_inp+full_chroma_int+accurate_rnd+bitexact"
-acodec libfdk_aac -b:a 320k -coder 1 -me_range 16 -bf 10 -q:v 1 -qmin 0
-qmax 69 -trellis 2 -mbtree 1 -mixed-refs 1 -preset veryfast medfull.mp4


and here is the output of mediainfo:

Complete name: medToCheck.mp4
Format   : MPEG-4
Format profile   : Base Media
Codec ID : isom
File size: 79.0 MiB
Duration : 10mn 0s
Overall bit rate mode: Variable
Overall bit rate : 1 104 Kbps
Writing application  : Lavf56.25.101

Video
ID   : 1
Format   : AVC
Format/Info  : Advanced Video Codec
Format profile   : High@L3.1
Format settings, CABAC   : Yes
Format settings, ReFrames: 4 frames
Codec ID : avc1
Codec ID/Info: Advanced Video Coding
Duration : 10mn 0s
Bit rate : 779 Kbps
Nominal bit rate : 850 Kbps
Width: 1 280 pixels
Height   : 720 pixels
Display aspect ratio : 16:9
Frame rate mode  : Constant
Frame rate   : 25.000 fps
Color space  : YUV
Chroma subsampling   : 4:2:0
Bit depth: 8 bits
Scan type: Progressive
Bits/(Pixel*Frame)   : 0.034
Stream size  : 55.7 MiB (71%)
Writing library  : x264 core 142 r2495 6a301b6
Encoding settings: cabac=1 / ref=1 / deblock=1:1:1
/ analyse=0x3:0x113 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 /
mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 /
deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=4 /
lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 /
bluray_compat=0 / constrained_intra=0 / bframes=10 / b_pyramid=2 /
b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 /
keyint=100 / keyint_min=25 / scenecut=0 / intra_refresh=0 / rc_lookahead=10
/ rc=cbr / mbtree=1 / bitrate=850 / ratetol=1.0 / qcomp=0.60 / qpmin=0 /
qpmax=69 / qpstep=4 / vbv_maxrate=850 / vbv_bufsize=2000 / nal_hrd=none /
filler=0 / ip_ratio=1.40 / aq=1:1.00
Language : English

Audio
ID   : 2
Format   : AAC
Format/Info  : Advanced Audio Codec
Format profile   : LC
Codec ID : 40
Duration : 10mn 0s
Bit rate mode: Variable
Bit rate : 320 Kbps
Maximum bit rate : 850 Kbps
Channel count: 2 channels
Channel positions: Front: L R
Sampling rate: 48.0 KHz
Compression mode : Lossy
Delay relative to video  : 80ms
Stream size  : 22.9 MiB (29%)
Language : English

and ffmpeg console output:

[root@vm1-108 FullVideoToTestOurCommand2]# 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
"scale=-1280:720:flags=spline+full_chroma_inp+full_chroma_int+accurate_rnd+bitexact"
-acodec libfdk_aac -b:a 320k -coder 1 -me_range 16 -bf 10 -q:v 1 -qmin 0
-qmax 69 -trellis 2 -mbtree 1 -mixed-refs 1 -preset veryfast -ss 00:00:00
-t 00:10:00 medToCheckNominalBitrateWithBufzieEqualToMaxrate.mp4
ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  configuration: --prefix=/usr --bindir=/usr/bin
--datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg
--libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2
-g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches
-m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls
--enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394