Ffmpeg record screencast without encoding on the fly.

does anyone know how which option to use to allow encoding after the initial recording, like recordmydesktop does? or is it even possible?
so far i have tried -preset ultrafast or -codec:v rawvideo.
this is the code from https://trac.ffmpeg.org/wiki/How%20to%2 … h%20FFmpeg
ffmpeg -f x11grab -s 1024x768 -r24 -i :0.0 -vcodec libx264 -crf 0 -preset ultrafast output.flv
it states
If you have a slow computer, it will not be smart to grab and encode your video at the same time, because slow CPU will not be able to do this. In that case, first grab all you need and save it as uncompressed video/audio and when you finish the grabbing process then start converting it to whatever you need:
however this is not the case as the final result is a flv that is already encoded. i have looked on forums and googled this question without any satisfactory results. it does not matter which solution i use that i have found so far, they always encode the video as it is being recorded. so any help appreciated.
spiritech
Last edited by spiritech (2014-03-06 18:00:02)

Use your own parameters.
If you want sound add something like:
ffmpeg -f alsa -i hw:0,0 -c:a pcm_s16le
The file will be huge.
ffmpeg -f x11grab -r 24 -s 1024x768 -i :0.0 -c:v rawvideo -pix_fmt yuv420p output.avi
Depending on what you are doing, lower fps, lower bitrate, easier it will be.
Something like this should work on a lesser machine.
ffmpeg -f x11grab -r 14 -s 1024x768 -i :0.0 -c:v libx264 -b:v 500k output2.avi

Similar Messages

Audio recording, saving and playback on the fly

i m new to this.
Using the flash media server, Is possible for user to record
an audio on the fly, save it in the server and playback at later
time.
What formal will the audio be saved as..
thx in advance
Angel

thx. that's really useful..
Yes the client side is a flashplayer 10.
So does that means .flv is the only format we can save it as?
Not .mp3 or anything else?
And the user can later retrieve it from our server and
playback anytime?
There are a few flash media servers. I'll just have to get
the "Flash interactive media server" only?
thx
Angel

How can I record video without sound?

I would like to record videos without audio on my iphone? Is their a way to record videos without sound in the default camera app? If not than does any one know of any apps that can?

Do you happen to have your phone set for mute? Apparently (with the Note 3) this would also mute recording of sound in videos. Using normal recording mode? Slow mo and other modes may not record sound either.

Recording a stream and using it on the fly

Hi,
I'm trying to upload a video stream from a flash client and
convert the video stream on the fly (from an external converter
like ffmpeg or vlc).
Since I don't manage to send the stream directly to the
converter, a solution I have found is to publish the sream as
"record", and have a converter read the file to perform the
operation.
However, when setting the record method for publishing, the
recorded file is not written continuously. Incoming stream is
buffered, written, buffered, written and so on. So, the program
reading the file stops it reaches the end.
Is there a way in FMS2 to either:
- forward incoming RTMP stream to a stream converter (using
an outgoing RTSP stream or something like that) ?
- force FMS2 to dump the stream continuously, as soon as it
receives the incoming data ?
Thanks for any help,
Greg

Stream.syncWrite
Availability Flash Media Server 2.
Usage myStream.syncWrite
Description
Property; a Boolean value that controls when a stream writes
the contents of the buffer to a
FLV file when the stream is recording. When syncWrite is
true, all the messages that pass
through the stream are flushed to the FLV file immediately.
It is highly recommended that
user should only set syncWrite to true in a stream that
contains only data. Synchronization
problems might occur when syncWrite is set to true in a
stream that contains data and
audio, video, or both.
... sounds like a problem is occuring :)

Why doesnt X-Fi have on-the-fly AC3 encodi

I dont understand why Creative didnt add on-the-fly AC3 encoding on the X-Fi - considering the cost of the card, and 5million transistors? Surely it could at least be done in Software (drivers) with a bit of help from the CPU?
HDA X-Mystique 7. Gold is only a $80 sound card and has a C-Media 8768 8channel chip that encodes all audio (stereo, games, DVD's, etc..) in the PC to Dolby Digital 7. and outputs it as SPDIF - no analog inputs, no confusing DigitalDIN connectors. Just one optical connector
http://www.nvnews.net/reviews/x-mystique/
And considering all creative cards have major PCI Latency problems on various PC's (my SBLi've cuts out when passthroughing AC3 via Digital TV Tuner software, yet my onboard realtek AC97 chip works perfectly - changed the PCI latencies with no luck), I think I'm totally losing faith in Creatives workmanship Message Edited by Anarchi on 0-24-2005 0:50 PM

Partly because Creative have their heads up their rear ends when it comes to using a digital connection. They're more concerned with analog and do very little with the digital out which Dolby Digital Li've uses. I'm sure most are aware that only the advantage of using the digital out on a sound card and having speakers capable of decoding dd and dts is for movie watching.
Other activities will be limited to stereo which is fine for me I don't need my other speakers around me outputting the same thing. I will however be purchasing a set of speakers without a decoder next time probably Klipschs because I have horrible problems playing dvds in Windows XP MCE 05 with the digital out on(Logitech Z-680 decoding the dd or dts stream).
I didn't have the problems before with my SB Audigy 2 zs, but after responding to my email I sent Creative thinks it's MCE which is hogwash. FYI my problems are out of sync audio/video and glitchy audio when playing dvds I have to sometimes rewind or use the skip chapter button to correct the audio.

Dynamically populate a record group on the fly uisng LOV

Hi,
I want to create dynamically populate a record group on the fly uisng LOV.
1. This is how the RG_BANKNAME Record Group object look like
Object : Record Group
Name : RG_BANKNAME
Record Group Query : SELECT NAME, SHORT_NAME FROM C_BANKS
2. I create the Push Button and when user click it will popup the LOV.
DECLARE
     rg_id RecordGroup;
     errcode NUMBER;
     status BOOLEAN;
BEGIN
     rg_id := Find_Group('RG_BANKNAME');
     IF Id_Null(rg_id) THEN
          Message('No such group: ',ACKNOWLEDGE);
          RAISE Form_Trigger_Failure;
     ELSE
          errcode :=POPULATE_GROUP(rg_id);
          SET_LOV_PROPERTY('LV_NAME', TITLE, 'My Own LOV');
          SET_LOV_PROPERTY('LV_NAME', GROUP_NAME, rg_id);
          SET_LOV_COLUMN_PROPERTY('LV_NAME', 1 ,Title, 'NAME');
          SET_LOV_COLUMN_PROPERTY('LV_NAME', 1 ,Width, 150);
          SET_LOV_COLUMN_PROPERTY('LV_NAME', 2 ,Title, 'SHORT NAME');
          SET_LOV_COLUMN_PROPERTY('LV_NAME', 2 ,Width, 100);
          status := Show_LOV('LV_NAME',10,20);
          IF NOT status THEN
               Message('You have not selected a value.');
               Bell;
          END IF;
     END IF;
END;
My question is do I need to create the LOV Object name call 'LV_NAME'? since I don't have this
create on my design times, because I thought it can be done dynamically on the fly.
The problem is compliant that the Lov Id is not valid.
Thanks
David
Edited by: user445990 on May 24, 2011 9:19 PM

Hello,
You request is not clear. Do you need to display the LOV or not ? In other words, what is the goal of your record group ?
Francois

Is there any easier way to edit imovie files that have been exported as mov file then added to FCE 4?? As every move I make has to be rendered and takes forever??? Also my recording is going out of focus without me touching the camera, why has this happen

Is there any easier way to edit imovie files that have been exported as mov file then added to FCE 4?? As every move I make has to be rendered and takes forever??? Also my recording is going out of focus without me touching the camera, why has this happened any idea what causes this??
iMovie '08, Mac OS X (10.5.8), FCE 4

My daughter has had her Razr for about 9 months now. About two weeks ago she picked up her phone in the morning on her way to school when she noticed two cracks, both starting at the camera lens. One goes completely to the bottom and the other goes sharply to the side. She has never dropped it and me and my husband went over it with a fine tooth comb. We looked under a magnifying glass and could no find any reason for the glass to crack. Not one ding, scratch or bang. Our daughter really takes good care of her stuff, but we still wanted to make sure before we sent it in for repairs. Well we did and we got a reply from Motorola with a picture of the cracks saying this was customer abuse and that it is not covered under warranty. Even though they did not find any physical damage to back it up. Well I e-mailed them back and told them I did a little research and found pages of people having the same problems. Well I did not hear from them until I received a notice from Fed Ex that they were sending the phone back. NOT FIXED!!! I went to look up why and guess what there is no case open any more for the phone. It has been wiped clean. I put in the RMA # it comes back not found, I put in the ID #, the SN# and all comes back not found. Yet a day earlier all the info was there. I know there is a lot more people like me and all of you, but they just don't want to be bothered so they pay to have it fix, just to have it do it again. Unless they have found the problem and only fixing it on a customer pay only set up. I am furious and will not be recommending this phone to anyone. And to think I was considering this phone for my next up grade! NOT!!!!

Filter songs by rating (on the fly, without smart playlists)

Is there any way (3rd party app maybe) that would allow you to live filter the displayed/played songs by rating? ie. if I have an artist selected, and all 200 songs are shown by that artist -- I would like to select on the fly to only display/play songs that are rated 2 or higher.
Aperture has a similar function that does not require making smart lists -- "Display only 2 or higher" of the current album, etc. -- AND you can sort with a sub-filter in addition (in iTunes, I would show/play only 2 and higher, and maybe sub-sort by album, or shuffle it.)
The only current way to do this is to create a unique smart playlist for every artist, genre, etc. that you would want to filter by rating in that way. Alternately, you can sort by rating, so the best are at the top, but with large selection of those ratings I often want to be able to shuffle the order within that selected rating range.
This software addition would be very useful!
Thanks for any tips...

Merci beaucoup for the response. However, what you described in both cases are the workarounds that I described & that I've been using.
With sort by rating solution, the music can then only be sorted by rating -- and there will be songs of lower ratings played eventually.
Let me try to describe what I'm looking for more precisely:
Like in Aperture, there would be a small gui selection toward the top of iTunes, and you select what ratings should be shown/played -- for example, 2 & higher. Then, there will be no songs shown/played that are below 2 stars. You can then have it play on shuffle, or sorted by other data such as artist, album, etc. -- and you will never hear a song below 2 stars.
The smart playlist is the other workaround I've used, but it's also not the solution. It requires making a separate smart playlist for every possible artist/genre, etc. that you would want only (for example) 2 stars & above to play. For example, if on a whim I wanted to listen to all of my U2 music on random/shuffle -- I'd like to be able to just select Artist-->U2, and with the 2+stars GUI selection, I know I will never hear anything below 2 stars -- *without* having to take the time to make a smart playtlist for this random & rare mood. If I suddenly want a even higher selection of U2, I just click the 3stars GUI selection, and the shown & playable songs instantly update. No need to always have to create & edit smart playlists for such random selections...
This interface works extremely well in Aperture - I wish they'd migrate it over to iTunes!
I hope I'm clearer now... Thanks again

Recording sounds on the fly

Can anyone tell me if you can record sounds on the fly?
By that I mean during my voice recording and not in post production.
Our podcast is a live event. We do no editing or postproduction. Currently I use a PC to play sounds and feed them through the mixer into the line in on my iMac. I was hoping that GB3 podcast recording would allow me to just double click a file and have it added to my mix. I can't seem to figure out how to do this.
Most podcasters I know do zero post production. I can't understand why Apple wouldn't provide this feature.
Thanks,
Bry

Seems like we both have the same problem! I figured out how to assign an mp3 to a track then drag it to the "Musical Typing Keyboard" See this thread for details:
http://discussions.apple.com/thread.jspa?messageID=1512131��
You can also see my thread too, I appear to be asking for the same thing but dragging in each audio track seems way too complicated. I just want to play my audio clips from iTunes (from a little tempary playlist) during my show aka Daily Source Code. Let's figure this ***** out!
Here is my thread:
http://discussions.apple.com/message.jspa?messageID=1707459#1707459
Cheers
Richard

How to generate 2 breakpoints on an encoder using the NI-7344 without physically connecting the encoder to a second axis?

I'm using the NI-7344 motion-controller (for the control of 2 servo-motors) in combination with an E-series DAQ-card.
I need to acquire data at two different scanrates using breakpoints over RTSI, one channel for example every 10 encoderpulses, the second channel for example every 200 encoderpulses.
I'm using on onboard program that uses the modulo breakpoint for generating a pulsetrain over RTSI, but I also need a breakpoint (from an unused axis) to generate the other pulsetrain.
Is there perhaps a way to tell an axis to use the encoder from another axis so the breakpoint can be generated at this axis without having to connect o
ne encoder to two different axis?
thanx

Hello,
I am alittle confused about your application, but maybe this will answer your questions. In the "Configure Breakpoint VI" you can set the Axis or Encoder input as the following: Axis or Encoder is the axis or encoder to be controlled. You can enable Breakpoint Position on encoders mapped to axes 1 through 6 or directly on encoders 0x21 through 0x24.
So you can use an encoder that is not mapped to that axis.
Please let me know if this was not your question.
Regards,
Andy Bell
Applications Engineer
National Instruments

Changing from Active to Standby in a DHCP Failover scenario (on the fly) without deconfiguring operation...

Hi all;
Suppose I have set up a scope in SRV01 to be in Active mode. Is it possible to change its state to Standby mode (on the fly) without deconfigurig it and then configuring it again with my desired configuration?
Thanks
Please VOTE as HELPFUL if the post helps you and remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading
the thread.

Hi all;
Suppose I have set up a scope in SRV01 to be in Active mode. Is it possible to change its state to Standby mode (on the fly) without deconfigurig it and then configuring it again with my desired configuration?
Thanks
Please VOTE as HELPFUL if the post helps you and remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading
the thread.

Some strings for which expression pedal is used is recorded well but during esch playback I have to move the modulation wheel. How can I resolve to hear my instrument during playback without twikking on the wheel !

Some strings for which expression pedal is used is recorded well but during esch playback I have to move the modulation wheel. How can I resolve to hear my instrument during playback without twikking on the wheel !

I am having the same problems. My guess is that a lot of people are having the same problems and just living with it. Those of us who know where to go on the Internet come here to find a fix.
It seems Verizon has some explaining to do. Maybe they should try Beta testing new software a little better. I would rather have to wait longer for something that works. I am sure that some manager or director said this is close enough, deploy it and we will see what happens. Well, you are seeing the problems. Time to fix your mistake.
All of us are telling our friends about the problems. The longer this goes on, the more people we will tell about it.
Wouldn't you rather us be telling our friends that their is an error in the new interface and that you are working hard to fix it?
If you want to be up front about this, then just tell us. We are adults and can handle it. If you made a mistake, own up to it and give us some credit for doing your Beta testing in the field.
Customer Service is all about telling the truth and if you made a mistake, admit it and lets move on with a fix. I do not want to be told again that I should be able to unplug it, power cycle it, try the on-board diagnostics, etc., etc.......
I am going to be repsonding on a daily basis to keep this topic at the top of the list.
Time to come clean. You will feel better Verizon.
Let's talk tomorrow.

HT1006 why when hit the record button I lose the song on my music track for a second or so then the sound returns. I would like to be able to record on the fly while still hearing my accompanyment

guys am new to garageband. I am trying drag a non vocal track into my project, open another vocal track and and record my voice with a mic via my interface. When i hit play I hear the non vocal track, but when I hit record everything stops for a second including the non vocal track and then continue playing, and recording. why cant I record on the fly like other programs. what am I doing wrong. Help is greatly appreciated

GB doesn't offer "punch-in" recording. But you can easily set an earlier recording point, so you can listen to as much as you want from the audio track, and later cut your recorded snippet to the desired length.

Generate & Export PDF on the fly without holding entire pdf contents memory

Hello Everyone,
We are using Crystal Reports JRC (in our server side application. In a typical use-case the generated report is exported into the pdf format and streamed to the client/browser.
My question is with regards to the current interface/implementation of the JRC export api(s), which returns an InputStream which is basically a ByteArrayInputStream?, Why ByteArrayInputStream ? why not a custom InputStream imeplementation which really benefits from the streaming approach, and give you the option to stream the contents as they are generated on the fly, instead of it holding the entire report contents in a byte-array, as is the case with using ByteArrayInputStream. Since, this often seems to choke our system with regards to memory footprint, when the generated report contains huge dataset.
Please comment? Is that not possible ? Is there any reason why ByteArrayInputStream is the only way to retrieve the report contents ?
Thanks,
Farhan.

We have new place called Idea Place, look up on the right hand side. Great place to add enhancement requests.
Or the link: http://www.sdn.sap.com/irj/scn/idea-place

Generate & Export PDF/CSV on the fly without holding entire contents in mem

Hello Everyone,
We are using Crystal Reports JRC (in our server side application. In a typical use-case the generated report is exported into the pdf/csv format and streamed to the client/browser.
My question is with regards to the current interface/implementation of the JRC export api(s), which returns an InputStream which is basically a ByteArrayInputStream?, Why ByteArrayInputStream ? why not a custom InputStream imeplementation which really benefits from the streaming approach, and give you the option to stream the contents as they are generated on the fly, instead of it holding the entire report contents in a byte-array, as is the case with using ByteArrayInputStream. Since, this often seems to choke our system with regards to memory footprint, when the generated report contains huge dataset.
Please comment? Is that not possible ? Is there any reason why ByteArrayInputStream is the only way to retrieve the report contents ?
Thanks,
Farhan.
Edited by: mfarhans on Feb 26, 2010 12:40 AM

We have new place called Idea Place, look up on the right hand side. Great place to add enhancement requests.
Or the link: http://www.sdn.sap.com/irj/scn/idea-place

Ffmpeg record screencast without encoding on the fly.

Similar Messages

Maybe you are looking for