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, whos
On Wed, May 13, 2015 at 7:07 AM, Anatol 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. It appears as a
On Tue, May 12, 2015 at 3:16 PM, Henk D. Schoneveld wrote:
>
>> On 12 May 2015, at 13:50, Werner Robitza wrote:
>>
>> On Tue, May 12, 2015 at 11:47 AM, Henk D. Schoneveld
>> wrote:
>>> Would you be so kind to explain why to NOT use the crf option?
>>
On Tue, May 12, 2015 at 2:45 PM, Christian Ebert 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 this thre
On Tue, May 12, 2015 at 11:47 AM, Henk D. Schoneveld 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 purposes, this is not
> 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 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 interval.
> I'm not so
On Mon, May 11, 2015 at 10:49 PM, Joel Lopez 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 aligned? We have
On Tue, May 5, 2015 at 12:05 AM, Joel Lopez 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 keyframe interval for your e
On Thu, Apr 30, 2015 at 5:26 PM, Joel Lopez 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, for encoding, you'll h
On Thu, Apr 30, 2015 at 3:04 PM, Werner Robitza
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 own cannot do
On Thu, Apr 30, 2015 at 2:22 PM, Chris Zecco 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 new to us
On Wed, Apr 29, 2015 at 8:36 PM, Joel Lopez wrote:
> Hi,
>
> I'm trying to decipher what the values are in the info presented. I need
> to determine how far apart the keyframes are. 3 seconds is what I hear
> they should be for adaptive bitrate switching.
Anything between 2 and 10 seconds is re
On Tue, Apr 21, 2015 at 9:24 PM, Nicolas George 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 m
On Tue, Apr 21, 2015 at 1:42 PM, aryan singh 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
> --enable-libvorbi
On Tue, Apr 21, 2015 at 10:01 AM, babeman92 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 project which you
On Thu, Apr 16, 2015 at 8:29 PM, David Favor 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 ":" as a sep
On Thu, Apr 16, 2015 at 8:42 AM, Clément Bœsch wrote:
> You may have notice that all the other libs are built static (.a), do that
> as well for x265 for consistency (and to make it works). And make sure the
> .so is not available anymore.
Of course, you're right.
Since I can wrap my head around
On Wed, Apr 15, 2015 at 2:17 PM, Clément Bœsch 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 with all th
On Wed, Apr 15, 2015 at 12:38 PM, Nicolas George 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 x2
On Wed, Apr 15, 2015 at 11:22 AM, Nicolas George wrote:
> Le sextidi 26 germinal, an CCXXIII, Werner Robitza a écrit :
>> If you mean $HOME/ffmpeg_sources/x265/build/linux, then the .pc file
>> is actually there.
>
> Alone with just .pc files? If not, that is not correct.
W
On Wed, Apr 15, 2015 at 9:57 AM, Nicolas George 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 ~ -name 'x265.pc'
On Sun, Feb 15, 2015 at 7:11 PM, Boris Liptak wrote:
> hello im using this to get frame from the vid {} placeholder for variables.
> -i {0} -ss 00:{1}:{2} -f image2 -vframes 1 -vf scale=853:480 {1}_{2}.png
>
> How can i get the subtitles to show on the output image. The input mkv
> video has subti
On Tue, Feb 10, 2015 at 3:23 PM, Knapek Miroslav 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 MTS fullHD f
On Mon, Feb 9, 2015 at 10:05 PM, Werner Robitza
wrote:
> On Mon, Feb 9, 2015 at 3:32 PM, thibault75 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 blac
On Mon, Feb 9, 2015 at 3:32 PM, thibault75 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 be resized.
ffmpeg -
On Mon, Feb 9, 2015 at 9:10 PM, 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 for ffmpeg to detect
On Sat, Feb 7, 2015 at 6:05 PM, Cristiano Chieppa
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 curiosity, how exactly are yo
On Thu, Feb 5, 2015 at 7:18 PM, Sareyka, Julian wrote:
> Hello all,
>
> I am trying to encode video for adaptive streaming and need CBR for that. So
> I use the -b:v, -minrate, -maxrate, -bufsize settings.
> But in the end I get a lower video bitrate as configured. With this command I
> end up w
On Wed, Feb 4, 2015 at 8:58 PM, S Andreason 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 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 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.
Download the latest static Lin
On Mon, Jan 26, 2015 at 5:35 PM, Nicolas George 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 https://github
On Sun, Jan 25, 2015 at 7:15 AM, 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, how can I acci
On Fri, Jan 23, 2015 at 3:46 PM, Mark Ambler
wrote:
> That is correct. Below is the command line I'm using currently as a test.
> Note that the url used in the second input is calling server side code that
> serves up the image file(s). Is there a param to turn off caching of the
> image so
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 Fri, Jan 23, 2015 at 3:28 AM, Mark 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 it seems ffmpeg
> caches the
On Thu, Jan 22, 2015 at 10:28 PM, Mark Ambler
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 says,
> Is there currently
On Mon, Jan 19, 2015 at 6:46 PM, Werner Robitza
wrote:
> ffmpeg -i in.tif -pix_fmt yuv444p -q:v 1 out.jpg
>
Actually, use yuvj444p instead of yuv444p.
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On Mon, Jan 19, 2015 at 6:05 PM, Andrea Rastelli
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. Also, if you want y
On Mon, Jan 19, 2015 at 7:49 AM, Robert Nagy 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 "pop"?
>
On Mon, Jan 19, 2015 at 5:53 PM, Andrea Rastelli
wrote:
> Hi,
>
> I'm trying to convert a TIFF image sequence into JPEG (sequence) for
> preliminary video analysis, and I need to save the JPEG using yuv444 or
> yuv442.. but all I have achieved by now is the simple TIFF to JPEG
> conversion with s
On Thu, Jan 15, 2015 at 9:53 PM, Green Koopa wrote:
> Any tips on where I could have learned that without
> bothering everyone with basic questions?
It's all documented under ffmpeg -h full. The problem is that some
global options are mapped to the encoders, so they're not explicitly
listed under
On Wed, Jan 14, 2015 at 12:18 PM, Sravan Ratakonda
wrote:
> [mpegts @ 002de280] HEVC bitstream malformed, no startcode found
> av_interleaved_write_frame(): Not yet implemented in FFmpeg, patches welcome
Since v2.1 ffmpeg supports demuxing of HEVC in MPEG-TS, but AFAIK not muxing.
___
On Wed, Dec 31, 2014 at 4:16 AM, Yafes Sahin
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 programming
language of your
Something I just noticed.. when I encode audio with libfdk_aac, and I
use the default profile, I get what I want:
ffmpeg -i TL00_SRC01.avi -c:a libfdk_aac -vn -b:a 320k ../tmp/audio-320-lc.m4a
ffmpeg version 2.2.3 Copyright (c) 2000-2014 the FFmpeg developers
built on Jun 16 2014 06:10:18 with g
On Friday, August 15, 2014, Moritz Barsnick wrote:
> On Fri, Aug 15, 2014 at 16:29:06 +0200, Werner Robitza wrote:
> > of ffmpeg. Ubuntu runs in a virtual machine. Running the exact same
> > encode once under VMware Player and VirtualBox gives me different file
> > si
I have a file that is encoded with ffv1 using an Ubuntu-built binary
of ffmpeg. Ubuntu runs in a virtual machine. Running the exact same
encode once under VMware Player and VirtualBox gives me different file
sizes.
Why is that happening? You'd expect that (especially for a lossless
codec like ffv1
On Wed, Jul 23, 2014 at 4:02 PM, Christian Ebert 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 out%05d.ts
That wou
On Wed, Jul 23, 2014 at 10:53 AM, Miyoa wrote:
> I would need to test different video/audio codecs on several mobile phones.
> Specifically, I would like to start streaming a content whose video stream
> has been coded using H.263 Profile 0 Level 10 (video), MPEG-4 AAC (audio)
> and total bitrate
On Wed, Jul 23, 2014 at 2:46 PM, Christian Ebert 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).
___
f
On Wed, Jul 23, 2014 at 12:42 PM, Carl Eugen Hoyos wrote:
> Why are you using a bitstream filter when re-encoding?
> The normal usecase for a bitstream filter is remuxing.
If I don't use it, e.g.
ffmpeg -y -i tmp/tmpPass2.mp4 -c:v libx264 -acodec copy -map 0 -f
segment -segment_time 5 -segment_
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 ./srcVid
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