On Thu, Feb 27, 2025 at 11:49 PM Vladimir Mishonov via ffmpeg-user <
ffmpeg-user@ffmpeg.org> wrote:
> On 2025-02-28 02:36, Greg Oliver wrote:
>
> > On Thu, Feb 27, 2025 at 11:25 AM Vladimir Mishonov via ffmpeg-user <
> > ffmpeg-user@ffmpeg.org> wrote:
> >
On Thu, Feb 27, 2025 at 11:25 AM Vladimir Mishonov via ffmpeg-user <
ffmpeg-user@ffmpeg.org> wrote:
> So, I've managed to figure out that this may be related to input streams
> having different resolutions.
>
https://ffmpeg.org/pipermail/ffmpeg-user/2024-August/058638.html
> In the meantime, I
On Tue, Jan 14, 2025 at 11:37 AM Shane Warren wrote:
>
> I am transcoding live multicast using hardware (decoding using nvidia and
> encoding using nvidia (h264_nvenc) and going out multicast at fixed framerate
> and constant bitrate. Normally the output is about 3-5 seconds behind the
> input.
Clément Péron wrote:
> On Sun, 3 Nov 2024 at 14:32, Oliver Fromme wrote:
> > Clément Péron wrote:
> > > [...]
> > > Adding the "-flags +low_delay" will give you
> > > muxer <- pts:47 pts_time:5.22 dts:47 dts_time:5.22 duration:1
&
ime:0.11 size:24883254 latency(total:104.805ms, decode
> 96.373ms/91%)
You might also try "-tune zerolatency".
Best regards
-- Oliver
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the above example?
Can it be improved? Or -- is there a way to use the zscale
filter with a dynamic formula that depends on frame number?
Maybe I've overlooked something here.
Best regards
-- Oliver
PS: Just in case somebody wonders why I'm doing that in the
first place ... My source v
static, the easiest way is probably to transcode
all files so they have the same properties, then you can use concat
to stream those.
Best regards
-- Oliver
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lain why you are actually doing all of that.
What is the purpose, what do you want to achieve actually, on a
higher level? There's probable a *much* easier way than trying
to dissect the video on the packet level.
Best regards
-- Oliver
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l ways to solve this. One way is to modify FFmpeg's
output by appending a tr(1) command like this:
ffmpeg ... 2>&1 | tr '\r' '\n'
That will cause the progress display to be printed on separate lines,
so it won't be overwritten. That trick works on Linux and BS
no need to involve FFmpeg at all, unless you want to
transcode the file on the fly. In this case you should take the
performance implications into account when multiple clients request
the file at the same time.
Best regards
-- Oliver
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s of binaries for its open source H.264
encoder openH264."
Source: https://en.wikipedia.org/wiki/Advanced_Video_Coding
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-- Oliver
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To
e the right one for streams that
change resolution. Maybe there is a peculiarity with the QSV code
that requires -noautoscale.
Best regards
-- Oliver
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To u
n that case,
you'll need another filter for deinterlacing and keeping the frame
rate, like ``yadif=mode=send_field:deint=interlaced'' or similar.
That might require a bit of experimenting.
Best regards
-- Oliver
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On Wed, Aug 21, 2024 at 2:41 PM Terje J. Hanssen
wrote:
>
>
>
> Den 15.08.2024 20:29, skrev Terje J. Hanssen:
> >
> >
> > tor. 15. aug. 2024, 13:27 skrev Wang, Fei W :
> >
> > On Wed, 2024-08-14 at 22:43 +0300, Dennis Mungai wrote:
> > > On Wed, 14 Aug 2024 at 15:27, Terje J. Hanssen
> >
or the proposed
option. Personally I would prefer that the FFmpeg developers spend
their time doing important things, like fixing bugs and implementing
*useful* new features, instead of implementing a feature with unclear
semantics that is rather a convenience option desired by a single
person.
d WHAT then happens with the original file, when write creates ANOTHER
> > > file ???
> >
> > NOTHING
> Another interesting variant. So we then have 2 output files with the same
> name.
Would you please stop this? This kind of discussion is not going t
ly.
Therefore, in general, it's better to avoid leading zeroes when
specifying decimal numbers.
Best regards
-- Oliver
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On Thu, Aug 15, 2024 at 12:02 PM Nicolas George wrote:
>
> Ulf Zibis (12024-08-14):
> > But for convenience FFmpeg CLI provides option `-y` for this task
>
> No, it does not. The -y option only disables a very simple, unreliable
> but convenient safety measure. It does not delete anything.
It act
On Wed, Aug 14, 2024 at 10:20 AM Ulf Zibis wrote:
>
>
> Am 12.08.24 um 19:04 schrieb Mark Filipak:
> >
> > That's a question for your operating system. I can change file times to
> > whatever I want via the TotalCommander file browser. There are probably
> > others.
>
> Isn't removing existing o
-r
Of course, that only makes sense if you have exactly one input
file and one output file, and you want to copy just the "mtime"
(modification time stamp) from the input file to the output
file.
Best regards
-- Oliver
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On Mon, Aug 12, 2024 at 6:06 AM Ulf Zibis via ffmpeg-user <
ffmpeg-user@ffmpeg.org> wrote:
> Hi,
>
> is there an option how to preserve the file time from the input file to
> the outputfile?
> My search for "file time" on https://ffmpeg.org/ffmpeg-all.html was
> resultless.
>
> -Ulf
>
DATE=$(sta
On Sat, Aug 10, 2024 at 7:21 AM Guddla Rupesh wrote:
> Hi I am Rupesh from India and I brought a new desktop pc with ryzen 5500GT
> APU and Asus prime b450 m k2 motherboard. I have installed debian Trixie
> testing Linux distribution and everything is working fine except I have
> some doubts rela
s sufficient "activity".
The filter produces log messages that include a "score" (0 - 100) for
each frame. I guess that score is what you're looking for.
Documentation:
https://ffmpeg.org//ffmpeg-filters.html#scdet-1
Best regards
-- Oliver
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0 at the time of this writing. See the announcement here:
https://sourceforge.net/p/mingw-w64/mailman/message/58776404/
Best regards
-- Oliver
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s is a raw stream of JPEG2k images):
D mjpeg_2000 raw MJPEG 2000 video
Just out of curiosity, why do you need to create MJPEG2k files?
In general, I recommend against doing that, unless you need it
for compatibility with a certain piece of hardware or software
that isn’t able to handl
ailed explanations, and no examples. It's only
useful as a quick reference when you already know how FFmpeg works.
Best regards
-- Oliver
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To unsu
tors,
authors, actors, CGI engineers and whoever else might be involved
with the making of a movie.
> > > ffmpeg -i in.flac -filter_complex 'acrossover=split=1500[LOW][HIGH]' -map
> > > '[LOW]' low.wav -map '[HIGH]' high.wav
> > >
> > > Is '[LOW]' in the syntax of stream specifier?
No, it's not a stream_specifier, it's a linklabel, see above.
Best regards
-- Oliver
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Java required),
but apparently this is for Windows only, so I haven't tried it either.
I don't have a download link right now, but I'm sure you can find it
with the web search engine of your choice.
Best regards
-- Oliver
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Mark Filipak wrote:
> On 17/07/2024 13.23, Oliver Fromme wrote:
> > Mark Filipak wrote:
> > > What if there's no such thing as frame in the future? Just think about
> > > it.
> >
> > What are you going to use instead?
>
>
deo codecs support variable frame rates
and/or frames with arbitrarily spaced time stamps. FFmpeg is able
to handle and create such video.
Best regards
-- Oliver
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ress down to a tiny file that isn't much larger than the
individual source images of the slide show.
I don't see how obsoleting frames will improve things.
Actually, I don't even see what "obsoleting frames" really means,
because you'll still need a time base, a
ide: Camera sensors have red/green/blue subpixels, so the
color model of the raw input is RGB.
Other than that, RGB has no meaning for video. For example, when you
transcode a video with ffmpeg, e.g. re-encode it from H.264 to H.265,
RGB is not involved at all.
>TVs need to have built-in har
Mark Filipak wrote:
> Thank you for your summary, Oliver. That has really, really helped. As you
> know, H.264 is
> prescriptive, not descriptive, which makes understanding it very difficult.
>
> It also lacks the strings: "I[- ]frame" "P[- ]frame"
ions may not cross the
boundary of an IDR-frame. I-frames that are part of an open GOP
are not IDR-frames.
Best regards
-- Oliver
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frames.frame.32.pict_type="P"
frames.frame.33.pict_type="B"
frames.frame.34.pict_type="P"
frames.frame.35.pict_type="B"
frames.frame.36.pict_type="B"
frames.frame.37.pict_type="P"
frames.frame.38.pict_type="B"
frames.frame.39.p
stored in the target
file (with mediainfo, or simply with a hexdump), I can see that there
is the libx265 option chromaloc=1. But the number 1 means "center",
according to the libx265 documentation.
Can somebody explain this?
(BTW, I'm using ffmpeg 6.1.1, but I guess it's n
prepend an assignment in front of the first line, like:
const my_wave = (
and remove the last comma at the end of the last line of data,
and append ``);'' to finish the statement.
Best regards
Oliver
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on the Internet like stars in the sky.
> Open ports want to be found.
Only if your router is misconfigured to let all ports through to your
internal network by default. If it does, then a relatively uncommon
piece of MPEG software will be the least of your problems.
Best regards
Olive
Oliver Fromme wrote:
> I've got another question about HDR re-encoding.
>
> There are "hybrid" files that contain both Dolby Vision (DoVi) and
> HDR10 (or even HDR10+) metadata at the same time. I don't care about
> the DoVi metadata, so I just remov
as a multimedia filter
named "sidedata". It's supposed to be able to delete side data from
frames. However, the documentation (manual page) refers to the
AVFrameSideDataType enum in libavutil/frame.h that conatins all
AV_FRAME_DATA_* values. But that enum does not contain
Paul B Mahol wrote:
> On Wed, Jun 26, 2024 at 11:43 PM Oliver Fromme wrote:
> > I'm using ffmpeg for a long time, but I've just recently started to
> > use it with 10bit HDR (HDR10) video.
> >
> > So far I found out how to re-encode HDR10 video with lib
se that
I need to take into account?
Best regards,
Oliver
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On Tue, Jun 18, 2024 at 9:50 PM Jim DeLaHunt
wrote:
> On 2024-06-18 08:16, Greg Oliver wrote:
>
> > On Tue, Jun 18, 2024 at 9:45 AM Mark Filipak
> > wrote:
> >
> >> …There needs to be a triage facility between ffmpeg-user and trac in
> which
> >> i
On Tue, Jun 18, 2024 at 10:22 AM Mark Filipak
wrote:
> On 18/06/2024 11.16, Greg Oliver wrote:
> > On Tue, Jun 18, 2024 at 9:45 AM Mark Filipak >
> > wrote:
> >
> >> MasterQuestionable appears to be the boss of trac. I don't know whether
> >> Mast
On Tue, Jun 18, 2024 at 9:45 AM Mark Filipak
wrote:
> MasterQuestionable appears to be the boss of trac. I don't know whether
> MasterQuestionable is a
> person or a group. The language from MasterQuestionable is as one would
> find in a chat among peers
> (i.e., developers) who come into the cha
On Sat, Mar 2, 2024 at 9:52 PM Mark Filipak
wrote:
> I have a couple of things to look at.
>
> https://markfilipak.github.io/Video-Object-Notation/Streams.html
>
> https://markfilipak.github.io/Video-Object-Notation/GOP%20%26%20Frame%20Reordering.html
>
> Comments are welcome. Please be brutal. '
On Sun, Feb 18, 2024, 11:04 AM Mark Filipak
wrote:
> On 18/02/2024 11.53, Gyan Doshi via ffmpeg-user wrote:
> > On 2024-02-18 09:59 pm, Mark Filipak wrote:
> >> On 18/02/2024 05.09, Gyan Doshi wrote:
> >>>
> >>> Add -mpegts_flags +initial_discontinuity to get rid of the corrupt
> packet messages.
On Wed, Nov 29, 2023 at 11:56 AM Carl Zwanzig wrote:
> On 11/29/2023 9:18 AM, David Bernat wrote:
> > You misinterpreted the response. I have emailed the correct unsubscribe
> > link several times.
> (emailed a link??? what does that mean?)
>
> In the footer of every message-
> > https://ffmpeg.
On Mon, Nov 6, 2023 at 11:13 AM sreekar manchukonda
wrote:
>
> Hello,
>
> I'm seeking help on how to utilize ffmpeg to apply an extensive number of
> filters—specifically over 2000, each filter including a crop, boxblur, and
> overlay—to a video over an hour long. The intention is to redact certai
On Fri, Oct 20, 2023 at 3:57 PM Ulf Zibis wrote:
>
>
> Am 20.10.23 um 20:14 schrieb Paul B Mahol:
> > On Fri, Oct 20, 2023 at 7:19 PM Ulf Zibis wrote:
> >
> >> Hi,
> >>
> >> in my last post "Codec 0x21000 is not in the full list."
> >> you can see, that also the included metadata is mostly missin
Top Posting On Purpose (with camelCase)
Could you please just stop the conversation here. It is time consuming...
On Wed, Nov 30, 2022 at 10:08 AM Dave Blanchard wrote:
>
>
> > I'm well-versed in "1984" and "Brave New World". "Animal Farm" is still
> > on my to-watch and to-read lists. I'm al
On Fri, Jul 8, 2022 at 5:25 AM jb wrote:
> Hello everybody,
>
> I have a control program which running as a systemd service. This
> program spawns ffmpeg and that is writing to a HLS playlist. I use this
> flags:
>
> -hls_flags append_list+delete_segments+omit_endlist+program_date_time
>
> Th
On Fri, Jul 1, 2022 at 9:03 AM Michael Koch
wrote:
> Hello,
>
> is it possible to show an image with FFplay for 5 seconds, and then
> exit? I did try this command in a Windows batch file, but it doesn't
> stop after 5 seconds. I drag and drop the image on the batch file:
>
> ffplay -autoexit -loo
On Tue, Apr 12, 2022 at 9:34 PM Greg Oliver wrote:
> On Mon, Apr 11, 2022 at 11:28 AM Steve Russell wrote:
>
>> Oh! Of couse... I hadn't considered that... I suspect you're right. Oh
>> well, I've learned something, thanks.
>>
>> I'll just
On Mon, Apr 11, 2022 at 11:28 AM Steve Russell wrote:
> Oh! Of couse... I hadn't considered that... I suspect you're right. Oh
> well, I've learned something, thanks.
>
> I'll just have to live with tweaking the GUI.
>
> Regards, Steve
>
Practically every video capture device uses the video4linu
On Thu, Dec 3, 2020 at 4:45 AM Максим Молодцов
wrote:
> Hello,
>
> I've faced with a strange issue. When I try to get an HLS stream and
> convert it to multicast, like this:
>
> ffmpeg -re -timeout 6000 -m3u8_hold_counters 5 -i
> http://xxx/HLS/HD.m3u8
> > -codec:v copy -codec:a copy -f mpegt
On Wed, Dec 2, 2020 at 11:43 AM Carl Zwanzig wrote:
> On 12/2/2020 9:32 AM, hinderanyoption81 via ffmpeg-user wrote:
> > Upon reading the "Compilation Guide / MSVC on Wiki", I am confused about
> at least three issues.
> > 1. The Guide starts with a sentence "FFmpeg can be built on Windows with
>
On Wed, Oct 14, 2020 at 10:40 AM Will Boba wrote:
> On 10/14/20 11:18 AM, Greg Oliver wrote:
> > sorry just realized I had to redirect stderr to get the results
> >
> > On Wed, Oct 14, 2020 at 10:17 AM Greg Oliver
> wrote:
> >
> >> On Tue, Oct 13, 2020
On Tue, Oct 13, 2020 at 8:50 AM Mar Andrés López
wrote:
> Dear all,
>
>
> I am using the following command to generate dash content from a file:
>
>
> ffmpeg -i video.mp4 –r 25 -c:v libx264 -c:a aac -b:a 128k -ac 1 -ar 44100
> -map v:0 -b:v:0 2M -map v:0 -b:v:1 145k -map v:0 -b:v:2 365k -map 0:a
sorry just realized I had to redirect stderr to get the results
On Wed, Oct 14, 2020 at 10:17 AM Greg Oliver wrote:
> On Tue, Oct 13, 2020 at 8:50 AM Mar Andrés López
> wrote:
>
>> Dear all,
>>
>>
>> I am using the following command to generate dash conten
On Wed, Sep 30, 2020 at 6:25 PM Mark Filipak (ffmpeg)
wrote:
> Nyquist [adjective]: 1, Reference to the Nyquist–Shannon sampling
>theorem. 2, The principle [1] that, to most faithfully reproduce an
>image at a given digital display's resolution, the samples must be
>made at or above t
On Tue, Sep 22, 2020 at 1:14 PM Mark Filipak (ffmpeg)
wrote:
> I could use some help in my efforts. Due to my ignorance, it's taking me
> weeks to figure out things
> that should be resolved in minutes. In 5 days, I'll be 74 years old. With
> corona virus and age, I
> don't know how much longer I
On Mon, May 25, 2020 at 11:58 AM Peter Münster wrote:
> On Mon, May 25 2020, Carl Eugen Hoyos wrote:
>
> > Please provide an input sample.
>
> Here is a sample, this time without corruption:
>
> http://pmrb.free.fr/tmp/ffmpeg-test/sample.mkv
>
> --
>Peter
>
Sorry to chime in late -
On Tue, Apr 21, 2020 at 9:40 PM Edward Park wrote:
> Hi,
>
> > I ended up just keeping it as a script and getting the developers to
> > incorporate it into our code. Thanks though! Since it is a script, a
> > single bash call is not too intrusive. If we had some C programmers, I
> > would have
On Thu, Apr 16, 2020 at 10:19 AM Nicolas George wrote:
> Greg Oliver (12020-04-14):
> > We currently use ffmpeg to combine 2 streams (telephony codecs) into
> > mp3/wav/flac, etc.. This is no problem - we use:
> >
> > ffmpeg -ar 8000 -y -f mulaw -i calls/example.g
On Tue, Apr 14, 2020 at 8:46 PM Michael Glenn Williams <
michael.glenn.willi...@smartblondeco.com> wrote:
> Hey Ted!
>
> Thank you for responding. Regarding -volume, i'm just putting 30
> without the %.
> Regarding -top and -left, my version of ffplay (the latest MAC OSX download
> from the websit
On Wed, Apr 15, 2020 at 5:43 AM Ted Park wrote:
> Hi,
>
> > Yeah, when we record the calls, the directory structure preceeding those
> > names is /MM/DD/HH and the filenames are MIN_SEC_MSEC.codec(side)
>
>
> I mean some phones specifically put g729a, and I assume it's the same for
> g729b. S
On Tue, Apr 14, 2020 at 3:30 PM Ted Park wrote:
> Hi,
>
> > Example using these files (suffix denotes codec - a and b are each side
> of
> > a call):
> >
> > 18_17_248.g729a
> > 18_17_248.g729b
> > 19_18_440.g711a
> > 19_18_440.g711b
> > 20_01_886.g729a
> > 20_01_886.g729b
> >
> That is really co
Hi,
We currently use ffmpeg to combine 2 streams (telephony codecs) into
mp3/wav/flac, etc.. This is no problem - we use:
ffmpeg -ar 8000 -y -f mulaw -i calls/example.g711a.ulaw -ar 8000 -f mulaw
-i calls/example.g711b.ulaw -filter_complex "[0:a][1:a]amerge[aout]" -map
"[aout]" output.wav
If we
;t possible (to say nothing of
finding the appropriate curve for each video).
What we need is a solution that analyzes the video to detect when frames
are dark and then lightens only those frames. What I think we need is
something like the "pp=autolevels" filter but I haven't had
uss the project in detail.
Thanks,
Oliver Dain
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Ok, thanks. Just want to make sure we get it right.
Am Di., 2. Juli 2019 um 18:02 Uhr schrieb Carl Eugen Hoyos :
>
> Am Di., 2. Juli 2019 um 17:57 Uhr schrieb Oliver Breidenbach
> :
> > Is there a procedure for getting an official review of the compliance?
>
> No, and it wou
plan to package the libraries?
What is the right place to ask such a question?
I've contacted Fabrice Bellard who is listed as the copyright holder
on the licensing page, but he told me to reach out to the community as
he is no longer involved.
Best regards,
Oliver.
--
Boinx Software L
> Oliver gmx.net> writes:
>
>>> Then please try to record with a much smaller resolution
>>> to verify that this is a performance issue.
>>
>> Ok, i do not exactly know what you mean. Which option
>> should i add to my the command i posted?
>
&g
> Oliver gmx.net> writes:
>
>>> Did you test the following?
>>> $ ffmpeg -f alsa -ac 2 -i default -acodec copy out.wav
>>
>> Yes i did, the output was fine, no unwanted wobbling or
>> anything else.
>
> Then please try to record with a
> Did you test the following?
> $ ffmpeg -f alsa -ac 2 -i default -acodec copy out.wav
Yes i did, the output was fine, no unwanted wobbling or anything else.
>> The output of the above command was:
>
> For future questions:
> Please do not cut the console output, particularly not
> the first (a
Hello,
i am experimenting with desktop video/audio capturing this is the
command i used:
ffmpeg -f alsa -ac 2 -i default -f x11grab -r 30 -s 1920x1200 -i
:0.0+1680,0 -acodec pcm_s16le -vcodec libx264 -preset ultrafast -crf 0
-threads 0 testout.mkv
this kind of worked but the audio in the resultin
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