Ubuntu Multimedia :: Losing Audio Sync When Editing Video In Openshot
Aug 31, 2010
my goal is to record video using a canon powershot camera, edit the avi file on my ubuntu 10.04 computer, then upload the rendered file to videos.
problem is that when i cut the video, the audio is no longer in sync with the video, it's off by about 1-2 seconds. this happens with both openshot and pitivi, so i suspect that it's caused by a bug with the codec. (files are avi with mjpeg codec). after searching launchpad, this is apparently a "known issue". that's great but for now i need a workaround.
i do have an old g4 powerbook with imovie hd v6 on it that i can use, but i'd prefer not to because:
1. the powerpc mac is much slower than my new dual core laptop
2. imovie compresses my videos too much so the rendered file is lower quality
3. i simply prefer openshot to imovie
i was thinking of preprocessing my avi files by converting them to another format with a non-buggy codec on linux. i downloaded ffmpeg, but not sure how to use it and what format to use. would mpeg2 be a safe one to use?
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Aug 9, 2010
I have a couple of .avi clips in which the sound plays 2 seconds before the video, so I need a software that can re-sync the sound correctly with the video with affecting the video/audio quality, what program can I use? What is the name of this feature in video editing programs? I am using Ubuntu 10.04. I noted that the Multimedia & video forum have only threads about problems in playing videos & cards drivers problems.
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Jul 9, 2011
Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps, the parameter is the maximum samples per second by which the audio is changed. -async 1 is a special case where only the start of the audio stream is corrected without any later correction.Searching the net makes one believe that this command is just some sort of magic.People just put it in the line and it just works. Isn't that nice?
It says nothing about how to change the TIME the audio starts syncing. Like do I want it to start 5 seconds delayed? Or what about 5 seconds sooner?What if the audio gets more out of sync as the video goes on? Can I slip it a little at a time? What? No magic?No one mentions a file that already has badly synced audio.So what -async 1 really does is simply start the audio at the beginning of the file. LIKE AS IF THAT ISN'T STANDARD PROCEDURE?So what is the exact solution to syncing a messed up video? And why can't it just do the proper "timestamp" sync in the first place?No docs, no info and you are left out in the cold.
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Dec 2, 2010
I watch alot of news videos and within 1 - 2 minutes the video and audio become out of sync. The video is lagging the audio. I'm using 10.10 32 bit with Shock Flash 10.1 r102 on Firefox. Will the 10.2 beta flash fix this problem?
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Mar 29, 2011
I put all my dvds on my "media center" by converting them to .MP4 with handbrake.
Recently I saw that with a MKV file you could do soft subtitles. I tested a part of a movie, and the audio and video are very out of sync.
With MP4/burned in audio everything is ok...
Edit: Ow yes I'm using XBMC for playing it. MP4 + MKV files are both H.264, they have the exact same settings except for subtitles...
Weirdly Enough: I tried another video and at this one the audio is in sync....
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May 27, 2011
After upgrading to 11.04, video and audio are out of sync by about one second when playing movies in VLC, or opening a clip on the web. Reinstalling does nothing.
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Sep 10, 2015
I have a problem with avconv. Most of the use cases work spledidly, but when I need to crop a segment and then splice multiple segments together, I get problems.
The process I use is this:
1. Raw recording of short segments in high-quality AVI, These are produced by avconv, some as screencast and some by combining a PNG file with flac audio from audacity.
2. Conversion segment by segment into mp4 and ogv
Options A: -acodec aac -strict experimental -ab 128k -ac 2 -vcodec libx264 -s 640x480 -pix_fmt yuv420p -movflags +faststart -crf 22
Options B: -acodec libvorbis -ab 128k -ac 2 -vcodec libtheora -s 640x480 -b 500k
3. Splicing of the segments using MP4Box or oggCat.
(I used to do this in ffmpeg, but I have not figured out how to do it in avconv.)
This works.
In some cases I need to crop the segments, using the copy codecs and the -ss and/or =t options.
If I crop the AVI segments (between 1 and 2) the sound is clipping (this also generates a spree of error messages `Non-monotonous DTS'). If I crop mp4/ogv segments, (between 2 and 3) the remaining video, after the cropped segment are out of sync. I get the same problems with both OGV and MP4 playing them in vlc. Playing the mp4 directly in iceweasel works as it should.
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Jun 8, 2010
I have recorded some video, and now wanted to add some sound.I added a sound track, but when it's playing, I can't hear anything.I'm usually running Jack - for Ardour/Hydrogen etc... - I can't find anywhere in OpenShot to change the Audio to Jack, so assume it's not supported.I have killed Jack in the hope that Alsa will work with OpenShot, but still I have no sound.
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May 3, 2011
I have a vp6 codec flv. I have a wav file that I want to convert into mp3 and added to the vp6 flv. So when I play the flv the audio is added and the video quality is not changed.I tried:ffmpeg -i 20.flv -i 20.wav -vcodec copy -acodec libmp3lame new_file.flvbut I an error "Could not write header for output file #0 (incorrect codec parameters ?)". I'm guessing because it is a vp6 flv codec.Is there a way to just add an audio file to the flv? There is no audio in the current flv. I cannot lose any quality in the video.
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Dec 22, 2009
Any repositories with the openshot video editor. -installing it from source?
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Sep 29, 2010
Does anyone know a Linux app that I can edit video with and also the audio. I need to bleep out some language in a video.
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Sep 28, 2010
How to sync audio and video which is captured from a aeperate camera device and a microphone,how to relate timestamps to audio and video to syncing.I m capturinfg video at 30fps and audio 160 samples everytime so how these 2 should be related to sync and playback at a time
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Apr 13, 2011
Found a weird issue with Openshot video editor ( Gnome, squeeze amd64 ) version 1.1.3-1 ( stable ) but it also applies after upgrading to version 1.3.0-1.1 ( from sid ).
After starting Openshot there are icons ( and tabs ) missing on the toolbar :
After hovering my mouse-pointer :
After ( in menu ) : View > uncheck Toolbar and again View > check Toolbar :
Choosing another gtk-style in gnome-appearance-properties : Theme > Customize... > Controls seems to solve it. I've checked different Controls, some have the same problem and others don't.....
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Oct 8, 2009
Is anyone using the video editor Openshot?
OpenShot Video Editor
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May 18, 2009
I've been trying to use cheese to record greeting from my kids to grand parents etc. But every time I record a video, the video is choppy and the audio sync is off. I've used the one in the (F11) repos and built it from source. It behaves the same using other distros as well. Is this par for the course with cheese, or is it my hardware?[URL]... Any other applications/methods to record audio & video while providing a video.
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Jul 4, 2010
How can one adjust/sync audio and video in gnome-mplayer while watching video
The following is my configuration :-
OS : Opensuse 11.2
Media Player : gnome-mplayer 0.9.9
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Jan 7, 2010
I am trying to use ffmpeg and mencoder to slice a portion of my video out but the audio is always 2 seconds out of sync.
ffmpeg -i bird.avs.MP4 -acodec copy -vcodec copy -ss 00:08:40 -t 00:01:00 test.mp4
mencoder -ss 00:08:40 -endpos 00:01:00 -oac copy -ovc copy bird.avs.MP4 -o test.mp4
mencoder -ss 00:08:40 -endpos 00:01:00 -oac copy -ovc copy -noskip bird.avs.MP4 -o test.mp4
[Code]....
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Oct 17, 2010
When I play large HD videos in mplayer, the video and sound frequently get out of sync, and the video plays a little strangely (occasionally speeding up and occasionally slowing down).
I think it's because mplayer is only running on a single core. As I've got a quad-core processor, it seems inefficient. I've seen that there is theoretically a way to get mplayer to work with multicore setups, but it requires compiling with different options. That'd take me a little while to work through.
Ideally there would be a pre-compiled version in the software centre, or a player which has support built in (again, ideally in the software centre). Is there such a thing available?
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Sep 15, 2010
I have a Zotac MAG HD N01 desktop computer hooked up to my 40" LCD Samsung TV in the living room. On this machine, I have Ubuntu 9.10 minimal installed, and the system is configured using the XCI script (a customization script to configure the system as an HTPC with XBMC).
Now, since the original install, I've tweak it a little, and one of the things I have it doing is its booting into a minimal desktop using the NODM login manager and it goes into OpenBox. Everything works fine and dandy, however, when I leave it for a while, it looses its connection and says "Searching for Signal" on my TV. I can remedy the situation by just hitting a key on the keyboard (Ctrl for example).
This also happens if i'm watching, say a flash video in a web browser for a while (like a hockey game), and all of a sudden, the screen cuts out.I've checked in the openbox configuration, and screensaver is turned off, but I can't seem to find where to configure any sort of power management. Is there a way to turn off the, what I can only assume, is a power management feature?
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May 24, 2011
I record my University lectures on a sound recording device. Unfortunately it means I'm often left with sections of sound I'd like to edit out. Is there a very easy to use program where I can do this?
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Oct 17, 2010
I've upgraded Ubuntu 10.04 to Ubuntu 10.10 yesterday and I'm experiencing some issues now.
Audio is out of sync for all videos I'm trying to watch in VLC (sync was 100% fine in Ubuntu 10.04).
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Nov 15, 2010
Does anyone know of any good command line audio editing tools? I would like one that can take an mp3 file and crop everything but the first 30 seconds or so (possibly decompressing those 30 seconds as well).
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Jun 20, 2011
I am burning DVD iso's and they seem to work great I have video output and sound output however as the film goes on the audio gradually becomes more out of sync but if I hit the rewind button on my remote and then play the sound is in sync again for a few minuets. I am using DeVeDe and Gnome Baker to create and burn my iso images to disc and they work great on the computer but not so great on my dvd players I am burning onto Verbatim DVD-R using Ubuntu 10.04 lucid lynx.
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Feb 5, 2015
I try to record video with my Win TV capture card with avconv. The exact same lines worked fine with Ubuntu 12 and with SUSE, but with Ubuntu 14, the audio is out of sync.
avconv -f video4linux2 -channel 1 -s 640x480 -i /dev/video0 -deinterlace -f alsa -i plughw:1,0 -ar 22050 -ab 64k -acodec ac3_fixed -vcodec mpeg4 -vb 2000k -y test.mp4
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Jun 5, 2011
I'm looking into buying Adobe Audition CS5.5 for audio editing on my windows partition so I was wandering if anyone has experience installing with WINE.I'm running Ubuntu 11.04 x86 on a dual core amd machine with 4gigs of ram
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Jan 5, 2011
I am attempting to backup DVDs that I own to .iso format so that I'm able to watch them using xbox media center. I've simply been copying the entire DVD to my HD in .iso using brasero.When I watch the .iso file in XBMC, the audio is a fraction of a second ahead of the video. The gap between the audio and video doesn't seem to change over the duration of the clip.
What are the likely causes of this issue? I've read that it could be a slow processor, little ram, or inadequate video card. If it's indeed a hardware issue, I suppose I'm SOL with my current laptop: a 2006 dell with a core 2 duo processor, 2GB ram, and a middle of the road video card at that time.Is there any software tweak I can explore to get the .iso file to sync properly?Also, I know it's customary for posters to list their system specifications, but I don't know how to call up my software or hardware setups.
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Dec 1, 2010
I've been transferring a bunch of VHS and old camcorder tapes to video files. I've noticed that some of these videos need color correction or sharpening, etc. Most of the linux video editing software out there is just for splicing videos together.Does Linux have any professional grade video editing software? Is there anyway for me to color correct some of these videos using Linux? I've been searching forums trying to find an answer. Anyone have an recommendations?If not, what are some good Windows based alternatives? I can always run an alternative in a Windows VM.
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Dec 10, 2010
what would everyone recommend for video editing?
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Jan 2, 2011
I'm seraching a video editor, that can play and edit/convert MP4 videos. I've already tried many of them, but they play it laggy and I bacome a terrible video. Perhaps I missed to download some codecs?
(ATI RADEON HD 4500, Ubuntu 32-bit)
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Jul 22, 2011
I like Ubuntu alot and I'm mostly dedicated to free software and I have a bit of a web show. I am thinking of doing a fresh install of Ubuntu and I was wondering what was the best way to get the most out of Ubuntu when it comes to video editing. Ubuntu always seems..... crappy when it comes to video editing, I've heard it's because of the watered down video codecs. But I have updated my ffmpeg and abunch of other stuff but most video editors are still very buggy when it comes to encoding.
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