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?
View 2 RepliesAudio 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.
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....
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.
View 9 Replies View RelatedI 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.
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.
View 3 Replies View Relatedmy 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?
I'm not sure what's causing it, but when I play or pause a flash video in Firefox or Chromium, there's about a second of audio delay.
View 1 Replies View RelatedI am using Firefox 5.0 with Ubuntu Lucid x64 and I have no audio with Flash video. Audio works just fine on other applications so I'm guessing this might be a permission's issue or setting of some sort? I also have: flashplugin-installer 11.0.1.60~110713-ppa0~lucid & flashplugin-nonfree 11.0.1.60~110713-ppa0~lucid installed with ALSA v1.0.24.2.
View 6 Replies View RelatedI switched from XP to Ubuntu a few days ago and I'm having a hard time getting flash to work properly in firefox. I can play videos and music in a non-flash format just fine, but flash videos play without sound and really choppily.
View 8 Replies View RelatedThis happens nearly anytime I watch any relatively lengthy flash video on ..... or other online flash players. I watch the video, and the audio is fine for a few seconds, but then the audio cuts off as the video continues to play. Sometimes, when I move the scrollbar of the screen/pause and replay the movie, it starts back up again for a few seconds then shuts off or plays the audio I just heard.
View 5 Replies View Relatedn an up-to-date kubuntu karmic I experience the following:watching a flash video with adobeflash in firefox in fullscreen mode, randomly the picture freezes while the audio continues. The video unfreezes when I move the mouse, the video then fastforwards to the actual replay position. Video card is nvidia geforce fx5200 on proprietary driver, I have the desktop effects enabled. Any idea what this is about? I discovered the effects causing wine windows to break (no window contents, no foreground, no reaction on mouse) when changing the desktops or minimizing them. Seems like there are some bugs in the window manager / decorator...
View 2 Replies View RelatedRecently audio stopped working in my flash video, when browsing in Chrome or Firefox, video is ok, but no audio. I don't know when did it stop to work. My system is SUSE 11.3 with all software up-to-date.
View 9 Replies View RelatedHow 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
View 1 Replies View RelatedI'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.
View 2 Replies View RelatedHow 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
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]....
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?
I'm trying to diagnose a weird problem ... maybe someone has an idea where to start. I'm having a problem with flash videos. The video part displays as if the fast-forward button is being held down; audio sounds correct.
I'm thinking "synchronization error" (duh!) but I'm not sure how to start to diagnose the issue. I'm running OpenSUSE 11.4 x64, and the problem shows up in both chrome and opera.
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).
I recently installed Ubuntu 10.10 AMD64 beta. After installing the flash player, everything worked fine. I installed a few updates, as well as Ubuntu Stuido from the synaptic package manager, and when I rebooted, I can't hear any sound from flash content displayed in Fire Fox. All other sounds work fine, and I made another user account as a test, and that account has full audio functionality, including flash...
View 5 Replies View RelatedI 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.
View 3 Replies View RelatedI 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
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.
So I got myself a USB capture card (EasyCap) to use for capturing gaming, digitizing my kids' old VHS movies, etc. It works fine, I've been using VLC to view and record stuff from it, but I've noticed one issue. When recording streams via VLC, even with no other programs running to give VLC as much CPU time as it wants, the audio slowly falls out of sync. I've tried the MP4 (H264/MP3) container and the OGG (Vorbis/Theora) container.
Early on you can't hardly tell, but the further into a movie you get the more out of sync the audio gets, so that by the end of the movie the audio is a good 1-2 seconds off. It's not a set amount either so I can't just split the audio to a separate file then shift it one direction or the other to make up for the difference, because like I said, the offset starts out at nothing and gets progressively larger as the movie goes on. When I select "display locally", the video/audio that is displayed stays in sync, only the video/audio that gets committed to the output file falls out of sync, and it doesn't matter if I play the file with Totem or VLC.
I recently installed Fedora 12 on a new gigabyte mb and for unknown reasons to me videos from ..... and others run very fast (5X) or more, and I'm also unable to get audio to work. All this only happens if I'm using KDE, all work ok in GNOME.
View 13 Replies View RelatedHave used DeVeDe to make DVD suitable for standalone player in lounge the player plays various formats. the problem is as the title suggests A/V not in sync. It was the first time I had ever attempted to create anything like this. Iam sure I set DeVeDe correctly, the file plays properly on the pc though.
View 1 Replies View RelatedIn the last week, whenever I play videos, online or offline, the sound and video are out of sync. Usually the sound is a full second behind the videos, but I've noticed it at less.
I just tried watching a video and whenever someone said something, the sound was a full word behind the movement of the mouth.
This never happened until recently. I think there was an update to the sound drivers a couple weeks back, but I'm not too sure.
i'm in 64 bit kubuntu, with the the nswrapper in 10.10http://www.metacafe.comin firefox i get the sound but not the video in metacafe, when the video is unblocked by flash block. Others have the same problem?
View 4 Replies View Relatedi've been experiencing an issue with audio playback for certain flash videos that stream from the web. most play smoothly, like the videos at videos. others have this strange background noise that is only present when there is audio (usually on news websites that host their own videos). when there is sound, there is a strange stuttering noise that disappears during the silent pauses.
here's a perfect example:
epidemic of tsa criminality: more agents caught stealing cash from luggage, another arrested for assault. the videos video at the top plays just fine. if you scroll down and watch the other video in the small box, you'll hear the stuttering. i have fedora 14 kde, adobe flash player 64 bit preview release 3 and rpm fusion codecs installed. the problem is also present in fedora 14 with gnome, same setup. the problematic videos play without the stuttering in ubuntu.