The simple solution to worrying about the need to optimise the code
for your cpu is to look at the output from top.
(I am actually interested in seeing the %CPU each of your processes
take up.)
Are both your CPUs fully loaded?
Yes - multi threading is not needed but you could always optimise
Are both your CPU cores loaded?
yuvdenoise is a bit of a complicated beast I don't think it'd be easy
to optimise.
A simple multithreaded optimisation technique is to use slices (less
than full height sections of the frame, each section is given to a
CPU) However yuvdenoise uses spatial ga
Hi Guys,
I'm wondering if anyone has some skeleton C code for writing
multithreaded filters.
Similar to this kind of pseudo code;
while not end of file {
read frame
create threads (number of CPUs)
for y = 1 to height {
while no available threads { w
outweigh your processing time. Mutexes are by no means
free.
Hope that helps.
Steven Boswell
From: Mark Heath
To: MJPEG-tools user list
Sent: Wednesday, September 21, 2011 3:21 PM
Subject: [Mjpeg-users] writing multi threaded code
Hi Guys,
I'm wondering if anyone has some skeleton C c
On 23/09/2011, at 12:20 PM, E Chalaron wrote:
> Cine scan films such as 8, 9.5, super 8 , 16 mm etc ...
> Either in 8 or 16 bits.
Sorry I mean, what file format (or library) would you be reading this
in as?
yuv4mpeg is in yuv format. I'm not aware of an rgb stream format.
Or would you be usi
On 23/09/2011, at 1:52 PM, E Chalaron wrote:
>
> The files are in a quicktime container as raw RGB data from cinelerra.
> But ... I suppose I can always denoise before rendering in X264 which
> will be in YUV anyway.
I was just thinking that if you were to implement yuvdenoise for RGB,
how wou
On 23/09/2011, at 11:37 AM, Steven Boswell II wrote:
If that's how you expect to use mutexes, an atomic integer would be
a LOT more efficient, e.g. the g_atomic_int functions in glib.
Those are implemented with processor instructions instead of OS
system calls.
I assume I'd need to use
On 14/11/2011, at 3:37 PM, sam wrote:
> Dear Friend ,
>
> I am a professor , i want to do it for my research project for
> students.partial please help me.
>
> I want to Multiplex n number of TS using mplex, i got downloaded
> from mjpeg.sourceforge.net and installed , how to mux continuousl
On 15/11/2011, at 4:47 PM, sam wrote:
> Hi Mark,
>
> Thank you for your reply,
>
> I have hardware encoder , which gives IP out , and it has 8
> channels , each channel gives me 2 ts.
>
> ffmpeg will encode again , then it is no use of using my encoder.
ffmpeg can be used to mux without encod
Does the mjpegtools support 9, 10 and 16 bit video?
I noticed this post in ffmpeg repository
http://git.videolan.org/?p=ffmpeg.git;a=commit;h=f7f6aaf988c224a10ad9ad67d7f7864746880c76
mentioning yuv4mpeg: support 9/10/16 bit pixel formats
Is this also supported in mjpegtools?
Mark
-
On 27/07/2005, at 7:24, Torsten Mohr wrote:
Hi,
i did not encode any MPEGs from an AVI for a longer time.
I find that ffmpeg is good for doing this.
It can read pretty much any file format, though I have come across a
few that it cannot read.
And it can write to a large number of format
On 02/10/2005, at 6:35 PM, Frank Albrecht wrote:
Is it possible to use mencoder or ffmpeg for capturing for
mjpegtools? I couldn't figure out how to create an input
satifying lav2yuv/mpeg2.
Hopefully this is will answer what you are asking.
Mplayer and ffmpeg can both produce a yuv4mpeg str
[EMAIL PROTECTED] wrote:
I want to extract an audio track from an avi to a wav file
The video stream is RGB uncompressed
the audio stream use ms-ima-adpcm codec
I've tried the work with various tools (mjpegtools, ffmpeg, transcode and
avidemux...)
The mjpegtools works fine on my video stream, bu
On 09/10/2005, at 2:43 PM, Bernhard Praschinger wrote:
AnY good way to batCh process this on the CLI besides a for loop and
ppntojpeg?
I would use convert this way:
for i in *.pnm; do convert $i `basename $i pnm`jpg; done
convert can do the conversation to nearly every picture format.
Bernhard Frühmesser wrote:
Hello,
I have a small problem :-)
I used the mjpegtools to record a movie from a VHS Video a while ago,
unfortunately i don´t have the VHS tape anymore, but i have all the
stuff on DVD. I would need a short sequence of the Video to use on
another DVD. Just a short
Bernhard Frühmesser wrote:
>>So far i have the vob file on the HDD, and mpeg2dec reads it, but do i
>> have to use a pipe here to store the output in a file? Right now the
>> video displays on the desktop. With -o pgm i get a pgm for each
>>frame.
>Why not use 'mpeg2dec -o pgmpip
Aleksander V. Dyomin wrote:
Hi!
Sorry for my poor english.
I have made misstake while writing script to encode my DV to MPEG2.
Exporting stream with mplayer I used "-vo yuv4mpeg:interlaced" option.
Later, on hw dvd player, I have seen "buggy" video, as described at
mjpeg-howto(wrong field orde
E.Chalaron wrote:
Hi all
This may not be relevant to everybody but ...
I am capturing here YUV frames using Coriander.
On my Athlon 32 it works fine and the used script to buld my movies back is :
(find . -name \* | xargs cat) | yuyvto4m -k -w 1244 -h 934 -a 1:1 -i p -r
16:1 | bunch_of_filte
E.Chalaron wrote:
Or perhaps not? The thing you most likely are experiencing is that find
list all matches i filesystem order, which may or may not be what you want.
You may be better off with find . -name \*|sort, or, if you don't need the
recursion, simply ls *.
The recursion wont work, as fi
Anne Wilson wrote:
On using the commant
mplex 1_title.mp2 1_title.m2v -o 1_title.mpg
You need to add '-f 8' to the mplex command line.
-f 8 has the same meaning as -f 8 in mpeg2enc, which is to produce a DVD
compatible MPEG file.
Since your m2v file is DVD compatible, you also must tell
Joe Friedrichsen wrote:
Hi! I have a DV stream that I'm trying to encode for DVD. I have an NTSC
DV camera, and it shoots in 3/1001. I can encode it perfectly well
into 3:1001 MPEG-2.
As an experiment, I wanted to make a 24000/1001 encoding (I didn't
really care about the output quali
On 14/12/2005, at 4:21 PM, Trent Piepho wrote:
When you use -F 4 -p, the mpeg file has its framerate set to 30
fps, but there
are only 24 frames encoded per second. The encoder puts in repeat
field flags
that tell the decoder to do the pulldown, which has the effect of
converting 24
fr
Andrew Stevens wrote:
For the same x2 special-case asd your algorithm there is also some very
interesting work based on ideas from some Sony researchers. Here you again
choose your weights dynamically based on context in which your new pixel
appears. However, the weight-selection function
I purchased a D8 camera to do the capturing. It is able to read video
8 tapes and send it via firewire.
I've been archiving the tapes on disk as DV files.
I'll edit the files together one day and burn them onto DVD.
Mark
On 07/09/2006, at 9:38 PM, Andrea Giuliano wrote:
> Hi,
>
> I hope this
Hi,
I was wondering if a yuv format standards converter exists?
I know that one could be pieced together with y4mscaler and a frame
rate converter.
Though I was wondering about doing adaptive interlace detection and
changing the behaviour of the scaling and frame rate interpolation
based o
Interestingly enough I attempted using mpeg2enc as a change (from
ffmpeg) just to see how things were progressing.
I had just compiled the mjpeg suite on my g5, to do some NTSC to PAL
conversion.
I used the following settings:
mpeg2enc -f 8 -q 2 -M 8
I couldn't get it using more than 2 of m
ffmpeg will produce transport streams.
To convert an existing program stream use this command:
ffmpeg -i file.mpg -acodec copy -vcodec copy file.ts
where file.ts is the output file. ffmpeg uses extensions to
recognise what format to write the file in. Though this can be
overridden with th
I have been using ffmpeg with the mjpeg tools for some time.
To convert from the myriad of formats that ffmpeg supports to yuv use
this command:
ffmpeg -i myfile.ext -f yuv4mpegpipe - | yuvmytool | etc.
To convert to another format from yuv4mpeg use this style of command:
yuvmytool | ffmpeg
On 30/08/2007, at 1:06 PM, David McNab wrote:
> On Thu, 2007-08-30 at 00:20 +1200, David McNab wrote:
>> Hi,
>>
>> Is there a sane way to perform, with the various yuv4mpegpipe-based
>> tools, something comparable to the keyframe-based automation found in
>> graphical video editors such as Cinele
I haven't looked thoroughly into this but it appears that the version
of yuvdeinterlace crashes on 480 height files, while works fine on
576 height files.
I'm not sure which version I am using, the tool doesn't have any
version information, it is the Motion-Compensating-Deinterlacer. I
d
On 14/09/2007, at 12:50 PM, David McNab wrote:
> There's an alternative implementation of yuvdeinterlace, unfortunately
> with the same name, at:
>
> http://silicontrip.net/~mark/lavtools/
:-) yeah that's my version. It was for non interlace aware temporal
filters, such as my original yuvafps
On 14/09/2007, at 3:23 PM, David McNab wrote:
>
>> I am thinking about doing something more intelligent than line
>> doubling. (maybe adaptive blending)
>
> Oh yes, please do! :)
>
>> And making better support for different chroma subsampling, but maybe
>> next week.
>
> Less urgent, since many y
Hi Martin,
The output from the help of ppmtoy4m is appearing on stderr not
stdout. You will need to redirect stderr through your pipe.
Depending on what shell you are using this is done in different ways.
tcsh:
ppmtoy4m -h | grep 420mpeg2 |& wc -l
bash:
ppmtoy4m -h | grep 420mpeg2 2>&1 | wc -
On 16/01/2008, at 2:28 AM, Christian Ebert wrote:
> * Steven M. Schultz on Friday, March 23, 2007 at 00:48:14 -0700
>> If you're using a PPC and OS/X there is a fantastically high quality
>> workaround for mpeg2enc's current buggy state.
>>
>> The BitVice encoder from:
>>
>>http://www.innobit
On 17/01/2008, at 3:34 PM, Steven M. Schultz wrote:
>
> On Wed, 16 Jan 2008, Christian Ebert wrote:
>
>> I get buffer underflows for longer stuff when encoding from dv to
>> mpeg2 for dvd with ffmpeg, and i really played around a lot with
>
> That's the rate control issue(s) I had in mind.
On 23/01/2008, at 5:16 AM, Florin Andrei wrote:
> Mark Heath wrote:
>>
>> Anyway I've been using the mpeg2 encoder in ffmpeg and have been
>> happy with the results.
>
> I asked recently on their mailing list if they solved the rate control
> issues and they
I've split this image into it's Y-U-V channels,
There appears to be no noise in the chroma channels only the Luma
channel.
This could be due to:
* the chroma channels being half resolution, not enough resolution to
represent the noise pattern. (below the nyquist value)
* the interference fr
Hi Andrea,
Since you mention that your camcorder, with the 1.2m S-Video cable,
produces the same pattern, it is unlikely to be a source of external
interference.
However you did mention you changed something recently inside your
computer? This change could be causing the interference.
I
>
> I wouldn't see that it would be difficult to write a yuvtool to copy
> the chroma channels into the luma and show the video image this way.
> Maybe include it in a set of video tools to display more engineering
> information about a yuv stream...
>
I have written a channel splitter availab
On 23/05/2008, at 8:03 AM, Florin Andrei wrote:
> I'm looking for a way to convert a 60fps video stream to true NTSC
> frame
> rate (29.97i). Converting frames to fields to half the frame rate and
> interlace is easy, but it's the shaving off of the 0.1% of the frame
> rate that worries me.
>
>
On 25/05/2008, at 6:43 PM, Christian Ebert wrote:
> * Mark Heath on Saturday, May 24, 2008 at 08:47:53 +1000
>> By the way I have my own blending framerate converter (yuvaifps)
>> available on my lavtools site
>> http://silicontrip.net/~mark/lavtools/index.php#yuvafps
>
Hi all,
I've been using mjpeg tools under OSX for some time now.
I have recently begun attempting to integrate the tools with Apple
Core services. However Xcode wants the mjpeg libraries to be
universal or it won't link against them.
I have tried the path of forcing Xcode to only produce
On 12/06/2008, at 11:23 PM, Mark Heath wrote:
>
> As you can see here it has attempted to tune for pentium3 and gcc
> spits it over command line options...
>
> I would like to have universal binaries as I do use a mixture of PPC
> and Intel macs.
>
> I am guessing to
On 22/06/2008, at 3:03 PM, Bernhard Praschinger wrote:
>>>
>>> I am guessing to build universal binaries is going to require
>>> some serious hacking of the build scripts. Can anyone help?
>> I discovered that adding the following option to configure helped
>> this issue:
>> --disable-depen
I'm not sure about y4mhist,
But it sounds like you are looking for something similar to my yuvdiag
tool.
renders a realtime histogram (among other things) suitable for
displaying with a yuv player of some sort.
http://silicontrip.net/~mark/lavtools/index.php#yuvdiag
Let me know if this is w
f anyone has any recommendations about making a package, I wouldn't
mind hearing.
There is a gcc build command in the comments:
gcc -O3 yuvdiag.c -L/sw/lib -I/sw/include/mjpegtools -lmjpegutils -o
yuvdiag
just replace the location of your mjpeg include and libraries.
Mark
>
> Cheers
> E
&
On 15/10/2008, at 6:00 AM, Curt Howland wrote:
>
> $ mplex -f 8 -S
> 0 -M -o "/tmp/Test/mov03d/mov03d.mpeg2" "/tmp/Test/mov03d/
> mov03d.m2v" "/tmp/Test/mov03d/mov03d.m2a"
> INFO: [mplex] mplex version 1.8.0 (2.2.4 $Date: 2005/08/28 17:50:54
> $)
> **ERROR: [mplex] File /tmp/Test/mov03d/mov03d.
On 18/10/2008, at 1:31 AM, Curt Howland wrote:
>> Are you able to make the file available?
>
> http://pages.suddenlink.net/curthowland/mov018.m2v
> http://pages.suddenlink.net/curthowland/mov018.mpg
>
> This is the original right off the camera, and the file created with
> mplayer -dumpfile "mov0
Does mpeg2enc support encoding 422 video?
Thanks
Mark
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On 23/01/2009, at 5:54 AM, Bernhard Praschinger wrote:
> The mjpegtools cannot create DV encoded files (at least I don't know
> how). They can only read them. The the best quality is a mjpeg encoded
> AVI/MOV at a high quality factor of 95. (100 might cause problems)
if you are wanting to use D
On 27/02/2009, at 10:33 AM, Christian Ebert wrote:
>
> ... | ffmpeg -f yuv4mpegpipe -i -
>
> but ffmpeg probably guesses right without specifying -f for
> input.
ffmpeg uses the extension of the filename to determine the format.
So if you are reading from a pipe/stdin you do need to specify the
On 27/02/2009, at 8:15 AM, Roman V. Shaposhnik wrote:
>
> ffmpeg doesn't care what's the input:
>$ ./ffmpeg -i test.dv -f yuv4mpegpipe test.yuv
For conversion to Y4M, I'm gonna plug my avcodec to y4m tool:
http://silicontrip.net/~mark/lavtools/index.php#libav2yuv
As for converting y4m to D
On 31/03/2009, at 6:51 AM, Bob Forsman wrote:
> (I am not sure if I am properly subscribed to this list yet. I have
> not
> received a confirmation email).
I've CCd you, so you'll know if you receive 2 email.
Sorry I can't help with the bitrate problem, but may be able to
provide some tool
>
>> Input #0, mpegvideo, from 'test.m2v':
>> Duration: 00:00:46.50, bitrate: 3938 kb/s
>>Stream #0.0: Video: mpeg2video, yuv420p, 720x576 [PAR 16:15 DAR
>> 4:3], 3938 kb/s, 25 tbr, 1200k tbn, 50 tbc
>> Output #0, yuv4mpegpipe, to 'pipe:':
>>Stream #0.0: Video: rawvideo, yuv444p, 720x576
e buffer size fixes the bug, then it's probably not
as urgent.
I need a video project to take my mind off work.
>
> And @Mark Heath... I had seen your tools before, and I
> will have another look at them in future. You have some
> really interesting code there, and with a b
Has anyone ported yadif (yet another de interlacing filter) to mjpeg
tools?
it appears to be the "best" software deinterlace filter.
Thanks
Mark
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