, but
the loop instruction was also critical to keeping the show going until the
audio file ran out.
Much appreciate all your help, thank you,
Cheers,
Simon
On Sat, Feb 19, 2022 at 11:05 AM Michael Koch
wrote:
> Am 19.02.2022 um 18:14 schrieb Simon Roberts:
> > Hi all, I would like
. Would anyone be willing to point me in the right direction?
Many thanks for any guidance,
Cheers,
Simon
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>
> [libx264 @ 02a5498aed40] frame B:2696 Avg QP:17.66 size: 2076
>
> [libx264 @ 02a5498aed40] consecutive B-frames: 1.4% 2.8% 3.6% 92.3%
>
> [libx264 @ 02a5498aed40] mb I I16..4: 48.2% 44.9% 6.9%
>
> [libx264 @ 02a5498aed40] mb P I16..4: 5.5% 6.1%
On Mon, May 24, 2021 at 2:18 PM pink panther wrote:
> I have a 325kb audio wave file recorded in g729. I am trying to trim it to
> 1 minute. I have tried almost every command I see from guys using ffmpeg
> and none seem to work.Can someone assist?
>
> In my experience, editing like this is
ra: 0.0% 0.0% 0.0% inter:
> 0.0% 0.0% 0.0%
> [libx264 @ 0x72b9f00] i16 v,h,dc,p: 99% 0% 1% 0%
> [libx264 @ 0x72b9f00] i8c dc,h,v,p: 100% 0% 0% 0%
> [libx264 @ 0x72b9f00] Weighted P-Frames: Y:0.0% UV:0.0%
> [libx264 @ 0x72b9f00] kb/s:11.58
>
> __
g-user <
ffmpeg-user@ffmpeg.org> wrote:
>
>
> On Saturday, 28 November 2020, 15:49:09 GMT, Simon Roberts <
> si...@dancingcloudservices.com> wrote:
> > So... the term "field" isn't used to describe one half of an interlaced>
> frame? 'coz I have devi
Thanks for the input Carl :)
On Fri, Nov 27, 2020 at 5:05 PM Carl Eugen Hoyos wrote:
> Am Fr., 27. Nov. 2020 um 19:50 Uhr schrieb Simon Roberts
> :
>
> > One camera feeds to a monitor that's only capable of a 60 Hz vertical.
> The
> > monitor just says "1080@6
Hi all,
I've been making video using the monitor outputs of a pair of Sony A6000
cameras (bypassing the 30 minute limit while gaining other limitations). I
take each camera's output through a splitter, one side goes to a monitor,
and the other to the recording machine.
One camera feeds to a
On Sun, Oct 25, 2020 at 10:33 AM Gyan Doshi wrote:
> On 25-10-2020 08:56 pm, Michael Koch wrote:
> > Am 25.10.2020 um 16:23 schrieb Simon Roberts:
[...]
> >> The solution I have in mind would probably be something that
> >> recognizes a
> >> black frame
umbers) and
replaces it with the immediately preceding or following frame).
Does such a filter exist, or could such behavior be tied together out of
the features that ffmpeg has?
Cheers,
Simon
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(303) 249 3613
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On Fri, Sep 11, 2020 at 7:13 AM Moritz Barsnick wrote:
> On Fri, Sep 11, 2020 at 05:43:09 -0600, Simon Roberts wrote:
> [...]
> > > Use ffmpeg instead of ffplay to show the stream,
[...]
>
> ffmpeg has several display output muxers/devices. The most common one
&g
On Fri, Sep 11, 2020 at 1:18 AM Carl Eugen Hoyos wrote:
>
>
> > Am 09.09.2020 um 23:07 schrieb Hans Carlson :
> >
> > I have a cheap USB pipe inspection camera and I want to see the output
> (via ffplay) real-time, but also record (via ffmpeg)
>
> Use ffmpeg instead of ffplay to show the stream,
I was unclear:
On Thu, Aug 27, 2020 at 2:52 PM Simon Roberts <
si...@dancingcloudservices.com> wrote:
> I have a little device that takes "old" composite video and sends it out
> to USB. It's recognized by video4linux2 and I can watch the VHS tapes that
> I'm trying to c
ed something with a format, yet, nothing.
Any idea how to proceed? Can I get more information from xawtv perhaps that
might help me know how it's succeeding and transfer that info to ffmpeg?
TIA,
Simon
--
Simon Roberts
(303) 249 3613
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On Sat, Aug 15, 2020 at 4:07 AM Cecil Westerhof wrote:
> I have to publish the video's from our Zoom meetings. Something went
> wrong. Halfway a recording the recording went from the speaker to the
> overview screen. I like to change the part of the video with the
> overview screen (people do
On Sat, Aug 15, 2020 at 5:01 AM Cecil Westerhof wrote:
> Through scripts I use ffmpeg for cutting and compressing videos and
> sometimes adding a watermark. Nothing fancy, but handy.
>
> In the past the original file was between 4 to 13 times bigger as the
> compressed file. Today I compressed a
On Fri, Aug 7, 2020 at 7:31 AM James Darnley
wrote:
> On 07/08/2020, Timothy W. Grove wrote:
> > I develop an application which displays a video, amongst other things. A
> > user may open just about any video format to view in the video display.
> > "Saving" a video will invoke ffmpeg to resize
frames from a source
that has radically varying frame rates.
On Thu, Jul 23, 2020 at 1:23 PM Simon Roberts
wrote:
>
> Hi all, I have some video files (video only, no audio) that were
> recorded using ffmpeg to capture a computer screen. Unfortunately, it
> seems that the frame rate is some
is what might cause this (it's an x11grab input
through libx264, and was using about 2.5 of the 4 cores the machine
has.) and how might I know that it's failing while the recording is
taking place?
TIA,
Simon
--
Simon Roberts
(303) 249 3613
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ffmpeg-user
> > [...snip, mostly successful scenario describing simultaneous recording
> > of four video channels...]
> >
> >> But... I get almost continuous buffer overruns after about a minute.
> >> Can someone tell me where to start learning about how I might fix this
> >> (I presume it can't be good that
[...snip, mostly successful scenario describing simultaneous recording
of four video channels...]
> But... I get almost continuous buffer overruns after about a minute.
> Can someone tell me where to start learning about how I might fix this
> (I presume it can't be good that it's doing this even
, like s16, s32, s16p and
more. I tried every one of these values after -sample_fmt on my
command line and every one of them was rejected as "cannot set sample
format 0x1 2".
Any guidance would be greatly appreciated.
--
Simon Roberts
(303
Hi all, I have a recording configuration going that's grabbing three
1080 30p inputs and one 720 30p input simultaneously, and seems to be
capable of either prores or libx264 crf 23 compressions. The resulting
video appears to be smooth, and when I include a clock in one of the
streams, it
On Wed, Jul 15, 2020 at 1:36 AM Marton Balint wrote:
> On Wed, 15 Jul 2020, Moritz Barsnick wrote:
> > On Tue, Jul 14, 2020 at 15:50:55 -0600, Simon Roberts wrote:
> >> On Tue, Jul 14, 2020 at 1:29 AM Carl Zwanzig wrote:
> >>
> >> > Decklink boards are _ve
> > > Decklink boards are _very_ touchy about formats and parameters. Try
> > > setting
> > > at least the resolution and frame rate on the input and see if that helps.
> > >
> > > I don't guarantee these, but it's a start:
> > > -f decklink -pix_fmt uyvy422 -s 720x486 -r 3/1001 "DeckLink SDI
On Tue, Jul 14, 2020 at 1:29 AM Carl Zwanzig wrote:
> Decklink boards are _very_ touchy about formats and parameters. Try setting
> at least the resolution and frame rate on the input and see if that helps.
>
> I don't guarantee these, but it's a start:
> -f decklink -pix_fmt uyvy422 -s 720x486
, 2020 at 8:50 AM Devin Heitmueller <
devin.heitmuel...@ltnglobal.com> wrote:
> On Tue, Jul 14, 2020 at 10:41 AM Simon Roberts
> wrote:
> >
> > Well, I found out more. If I connect the camera to the input through the
> > cabling, but remove the splitter, it w
I have two situations where I'm noticing significant latency, and I'd like
to know what to investigate with a view to perhaps reducing this.
1) When running ffplay (attached to a camera), the video I watch is about a
full second behind the "real world".
2) When recording multiple video channels,
, but ffmpeg doesn't see it.
Could the splitter be changing the pixel format? I'll read about those and
see if I can move forward that way.
On Tue, Jul 14, 2020 at 7:17 AM Simon Roberts <
si...@dancingcloudservices.com> wrote:
> Thanks Paul and Marton for the input. I will note that the simpl
"
> -preset superfast -crf 18 -minrate 8M -maxrate 8M -bufsize 10M -acodec
> libfdk_aac -vcodec libx264 -r 30 -f flv rtmp://x.com
>
> Hope that helps
>
> Regards,
> Paul
>
>
> On 14 Jul 2020, at 02:28, Simon Roberts
> wrote:
> >
> > Hi all,
Hi all,
I've been working with a Decklink Quad HDMI card under Ubuntu 20.04. The
kernel driver is loaded and the Blackmagic software "mediaexpress" displays
the input signal perfectly. However, when I try to use ffplay, it seems
like it knows which of the four channels on the card has a signal,
On Wed, Jul 1, 2020 at 12:22 PM Nicolas George wrote:
> Simon Roberts (12020-07-01):
> > Magic! plughw:1,0 works a treat. Are there any limitations, or caveats,
> > that I should be aware of? Is this a risk or tradeoff of any sort? I note
> > that the recording seems
On Wed, Jul 1, 2020 at 5:00 AM Nicolas George wrote:
> Simon Roberts (12020-06-30):
> > I get:
> > [alsa @ 0x55ac7254fd80] cannot set sample format 0x1 2 (Invalid
> > argument)
> > hw:1,0: Input/output error
>
> This message could be made better. This is
I'm trying to grab audio from a USB device that's managed by alsa. I find
that if I configure pulse to use this device, then I can grab successfully
with:
ffmpeg -f alsa -i pulse audiotest.mp3
But I need to refer to the hardware device directly, and I'm failing to do
that.
I have these cards:
>
>
>
> > I need to find an encoding, and presumably a file type, that a) works in
> a
> > streaming format, and b) is as low CPU usage as possible. I don't
> believe I
> > care about bandwidth, this is just shipped from one process to another
> and
> > consumed in real time.
> >
> > I tried using
s for a very low CPU overhead, but not caring about bandwidth, for
this?
TIA,
Simon
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I would like to get a live monitor of the output of an ffmpeg process (it's
actually a capture and compress process).
I believe I could achieve this by adding a streaming output, and then
separately starting an ffplay process to display that (I haven't tried this
yet, but have got most of the
On Sat, Jun 27, 2020 at 10:02 AM Carl Zwanzig wrote:
> On 6/27/2020 8:53 AM, Simon Roberts wrote:
> > 1) create a composite output that has all four of the inputs laid out one
> > per quadrant, so all can be seen on a single display
>
> Google "ffmpeg multiviewer",
I'm now able to take four input streams from my Blackmagic quad input card
and successfully map them into a single compressed output file. What I'd
like to do next is to "tee-off" a monitoring stream (literally for live
viewing). There are two features I'd like for this:
1) create a composite
On Sat, Jun 27, 2020 at 1:46 AM Carl Eugen Hoyos wrote:
> > Am 27.06.2020 um 05:26 schrieb Simon Roberts <
> si...@dancingcloudservices.com>:
> >
> > ffmpeg -i -f mpegts tcp://192.168.1.109:2000
>
> Either specify a constant quantiser with “-qscale 10 -mbd 2” o
quality of the image?
Many thanks,
Simon
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On Wed, Jun 24, 2020 at 4:26 PM Tom Sparks wrote:
> On 25/06/2020, Simon Roberts wrote:
> > On Wed, Jun 24, 2020 at 3:41 AM Tom Sparks
> wrote:
> >
> >> mkv is a better output format to use
> >>
> >
> > Thanks for this Tom, can you expand
nt into it, just "what somebody said" :)
> On 24/06/2020, Simon Roberts wrote:
> > Greetings all, I'm a pretty low-level ffmpeg user, just doing screen
> > captures, compressions, and some simple format conversions. I have not
> made
> > much progress und
On Wed, Jun 24, 2020 at 5:43 AM Moritz Barsnick wrote:
> On Tue, Jun 23, 2020 at 21:31:25 -0600, Simon Roberts wrote:
> > But I have no clue how to start with this. I tried simply adding more
> input
> > channels to my input specifications:
> [... elided my incorrect command
)
Can someone point me at a template for a command line that might do what I
need? If the explanation or resources might help me understand the concepts
better, that would be a bonus (and might result in my becoming a little
more self-sufficient!)
Cheers,
Simon
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(303) 249 3613
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