On Tue, May 21, 2019 at 4:08 PM Werner Robitza
wrote:
> I was looking for some documentation for the Lanczos resampling
> filter, but I cannot find any mention of the default value for the
> alpha parameter.
>
Based on some debugging: the
All,
I was looking for some documentation for the Lanczos resampling
filter, but I cannot find any mention of the default value for the
alpha parameter.
I see this in swscale.h:
For SWS_LANCZOS param[0] tunes the width of the window function
I also see that SWS_PARAM_DEFAULT is 123456,
On Wed, May 13, 2015 at 7:07 AM, Anatol anatol2...@gmail.com wrote:
Werner, can you please shortly explain the no-scenecut issue.
Without scenecut detection, if such event occurs in the middle of the GOP,
as it usually does, the video quality till the end of the GOP will be
rather compromised.
On Mon, May 11, 2015 at 10:49 PM, Joel Lopez badassmexi...@gmail.com wrote:
Could I just run my unaligned files through ffmpeg again with a set
keyframe interval and disabled scene cut detection?
Or do I need to scrap them and re-encode the source file and generate
new files that are properly
Make sure to disable '-g' option, occasionally x264 generates both forced
and '-g', increasing the bitrate, reducing the quality and causing some
other mess.
There's no way to disable the -g option. If you don't use it, x264
will stick to the default values of keyint=250 and min-keyint=25.
On Tue, May 12, 2015 at 1:25 AM, Joel Lopez badassmexi...@gmail.com wrote:
Can I add a few lower versions to the mix and a higher one?
Yes, you should do that.
Can I realign the keyframes of the existing files?
That's going to be hard. You're better off re-encoding from scratch
with a fixed
On Tue, May 12, 2015 at 2:45 PM, Christian Ebert blacktr...@gmx.net wrote:
* Nicolas George on Tuesday, May 05, 2015 at 17:28:33 +0200
As an additional note, the second solution if by far preferable, because
forcing the frame type too frequently ruins x264's bit allocation
algorithms.
As per
On Tue, May 12, 2015 at 11:47 AM, Henk D. Schoneveld belca...@zonnet.nl wrote:
Would you be so kind to explain why to NOT use the crf option?
CRF is essentially a constant quality mode, which results in variable
bitrate depending on the spatiotemporal complexity of the scenes. For
streaming
On Tue, May 12, 2015 at 3:16 PM, Henk D. Schoneveld belca...@zonnet.nl wrote:
On 12 May 2015, at 13:50, Werner Robitza werner.robi...@gmail.com wrote:
On Tue, May 12, 2015 at 11:47 AM, Henk D. Schoneveld belca...@zonnet.nl
wrote:
Would you be so kind to explain why to NOT use the crf option
On Tue, May 5, 2015 at 12:05 AM, Joel Lopez badassmexi...@gmail.com wrote:
Should I re-encode these videos or could they still work? I saw that it's
be possible to force keyframes on an existing video.
You need to re-encode them with either the force_key_frames option, or
by setting the
On Thu, Apr 30, 2015 at 5:26 PM, Joel Lopez badassmexi...@gmail.com wrote:
Thanks for the help. It's making a bit of sense now. It looks like my
keyframes are 1/3 of a second. Is less than 2 seconds apart ok?
For adaptive streaming the keyframes should be at regular intervals.
That means,
On Thu, Apr 30, 2015 at 3:04 PM, Werner Robitza
werner.robi...@gmail.com wrote:
There are many ways to get Bash on Windows.
I should add that you can also transform this into a Windows Batch
file, or a Java program that does the looping and executes ffmpeg.
What's important is that ffmpeg on its
On Thu, Apr 30, 2015 at 2:22 PM, Chris Zecco cze...@mreach.com wrote:
Thanks Moritz,
Would I enter this right into my command prompt, or would I create a separate
file to run this statement from? I keep getting an error saying File
unexpected at this time. Apologies for any ignorance. I am
On Tue, Apr 21, 2015 at 1:42 PM, aryan singh aryan...@gmail.com wrote:
configuration: --prefix=/root/ffmpeg_build
--extra-cflags=-I/root/ffmpeg_build/include
--extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin
--enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame
On Tue, Apr 21, 2015 at 9:24 PM, Nicolas George geo...@nsup.org wrote:
Le duodi 2 floréal, an CCXXIII, Werner Robitza a écrit :
This may or may not work depending on how you built x265.
It will work if the system is correctly configured and x265 is properly
installed, but this mailing-list
On Tue, Apr 21, 2015 at 10:01 AM, babeman92 brem...@cvz.es wrote:
avconv
Please note that this is an FFmpeg mailing list. You are using avconv
from the Libav project, which is similar to FFmpeg but a different
project.
This mailing list is for issues with the ffmpeg command from the
FFmpeg
On Thu, Apr 16, 2015 at 8:29 PM, David Favor da...@davidfavor.com wrote:
Looked through the docs
Please look more carefully:
x264opts (N.A.)
Set any x264 option, see x264 --fullhelp for a list.
Argument is a list of key=value couples separated by :. In filter and
psy-rd options that use
On Wed, Apr 15, 2015 at 12:38 PM, Nicolas George geo...@nsup.org wrote:
Le sextidi 26 germinal, an CCXXIII, Werner Robitza a écrit :
What's not correct?
Your installation of x265.
In what way, then? How else should I install it?
Of course I know that it does not include x265. Hence my
On Wed, Apr 15, 2015 at 2:17 PM, Clément Bœsch u...@pkh.me wrote:
On Tue, Apr 14, 2015 at 03:41:49PM +0200, Alexander Martin Dethof wrote:
Do that for x265 (or find the equivalent) and use make install (no root
needed, you have write perm in $HOME/ffmpeg_build). This will deploy a .pc
file
On Wed, Apr 15, 2015 at 9:57 AM, Nicolas George geo...@nsup.org wrote:
I also tried to modify the PKG_CONFIG_PATH var to
In the future, look for the .pc files instead of trying random values.
If you mean $HOME/ffmpeg_sources/x265/build/linux, then the .pc file
is actually there.
$ find ~
On Tue, Feb 10, 2015 at 3:23 PM, Knapek Miroslav kna...@mmsw.cz wrote:
I would like to kindly ask you for help. I try to encode my first mpeg-dash
video using these steps:
http://www.dash-player.com/blog/2014/11/mpeg-dash-content-generation-using-mp4box-and-x264/.
I use panasonic camcoder
On Sat, Feb 7, 2015 at 6:05 PM, Cristiano Chieppa
cristiano.chie...@gmail.com wrote:
I save the raw frames (NALs) in a file (some frames grabbed from a camera)
and I invoke the ffmpeg from the sw - like a batch program - to encode the
raw H264 in MP4.
The conversion works well.
Out of
On Mon, Feb 9, 2015 at 3:32 PM, thibault75 thiba...@capitalvision.fr wrote:
I've got some video in 4/3 and other one in 16/9.
I want to transcode this video to 1024x576 which is 16/9 ratio.
If it's a 4/3 i want black to be add on each side of the video and if it's a
16/9 i just want video to
On Mon, Feb 9, 2015 at 9:10 PM, chie...@elmaxsrl.it wrote:
I'm pretty sure that the raw H264 hasn't the timestamps.
The NAL units themselves, no, but AFAIK the SPS can indicate the time
base according to the VUI information in Annex E of H.264. So you have
to make sure that this is present
On Wed, Feb 4, 2015 at 8:58 PM, S Andreason sandrea...@gmail.com wrote:
I didn't get any reply to my Jan22 report, so I'm sending this again with
working examples, and freshly compiled ffmpeg code:
Good report, but have you considered posting an official bug report?
= https://trac.ffmpeg.org
On Wed, Feb 4, 2015 at 8:42 AM, Mohammad Shakir shaki...@gmail.com wrote:
I want to rebrodcast this stream on udp but getting error, please help me
to resolve this problem.
Do you even need the bitstream filter here?
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On Mon, Jan 26, 2015 at 4:58 PM, Dani A danix4u-at-yahoo@ffmpeg.org wrote:
So can someone amazing show me how I can install both the latest FFMPEG
library from FFMPEG.org and the PHPvideotoolkit v2 on my CENTOS/ Cpanel? My
server is live and I do not want to start testing stuff on it.
On Mon, Jan 26, 2015 at 5:35 PM, Nicolas George geo...@nsup.org wrote:
So if you plan to run code that REQUIRES ffmpeg-php to work, my guess is
that you will need to run ffmpeg-php with whatever ancient version of
ffmpeg is available for your CentOS.
To add to the confusion, there is also
On Sun, Jan 25, 2015 at 7:15 AM, meino.cra...@gmx.de wrote:
I have an video file (h264), which is without audio. I want to add
music to it and have an audio file of the correct length.
Is it possible to add that audio file to the video file without
re-encoding one or both files?
And if yes,
On Fri, Jan 23, 2015 at 3:28 AM, Mark mwambler-at-yahoo@ffmpeg.org wrote:
Thanks for responding. I'd like to alter the overlay image / watermark based
on an external condition. So far I've tried pointing the image input to an
http servlet that will alter the image data. Didn't work as
Is there any documentation on how to actually use the dashenc muxer?
More specifically, how multiple representations can be added to an
adaptation set?
Or is it just limited to one video/audio stream at the time?
I would hope that some documentation is added until the next release.
On Thu, Jan 22, 2015 at 10:28 PM, Mark Ambler
mwambler-at-yahoo@ffmpeg.org wrote:
Hi All,Found this thread on the mailing list from back in 2012. Was it ever
implemented? if yes... any command line samples out there?
https://ffmpeg.org/pipermail/ffmpeg-user/2012-August/008703.html
It
On Mon, Jan 19, 2015 at 7:49 AM, Robert Nagy rona...@gmail.com wrote:
However, at the first 1-2 seconds of the video the text looks quite a bit
worse and then pops to better quality.
Is there some setting I can use so that x264 uses a higher bitrate at the
beginning of a clip as to avoid the
On Mon, Jan 19, 2015 at 6:05 PM, Andrea Rastelli a.raste...@rbw-cgi.it
wrote:
$ ffmpeg.exe -pix_fmt yuv422p -i in.tif out.jpg -q 1
Set -q before specifying the output filename.
-pix_fmt specified before -i will try to read the input with said format.
That doesn't make a lot of sense here.
On Wed, Dec 31, 2014 at 4:16 AM, Yafes Sahin
yafes7-at-yahoo...@ffmpeg.org wrote:
So what is the right way of streaming raw-input from a camera or any
raw-video source.
I'd capture the raw data, wrap it in UDP packets, and send it manually
over the wire. You could do this very easily with any
On Wed, Jul 23, 2014 at 4:02 PM, Christian Ebert blacktr...@gmx.net wrote:
If it's about avoiding intermediate files, encode to mpegts
directly and pipe it to the segmenter:
ffmpeg -i input.mp4 -f mpegts -c:a copy -c:v libx264 - | \
ffmpeg -i - -c copy -map 0 -f segment -segment_time 5
I have an x264-encoded MP4 file which I'd like to segment into MPEG-TS.
ffmpeg -y -i tmp/tmpPass2.mp4 -c:v libx264 -acodec copy -map 0 -f
segment -bsf h264_mp4toannexb -segment_time 5 -segment_format mpegts
./tsSegmentsDisplay/SRC04_Q1_%05d.ts
The original was encoded with:
ffmpeg -y -i
On Wed, Jul 23, 2014 at 2:46 PM, Christian Ebert blacktr...@gmx.net wrote:
I guess you just want to copy (-c copy both video and audio), not
re-encode (-c:v libx264)
I do want to re-encode (for various reasons, one being that I need
another keyframe interval).
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