Works across all platforms. If the synchronization value is incorrect, then the audio (or the video) is going to be played early or with a delay, compared to the other, which is commonly known as ‘lip-sync’ errors, and it jeopardizes all the excitement, obviously.VR Sync. ‘ Audio to video synchronization‘ is an extremely important aspect of a multimedia file, because when playing, multimedia players rely on it for properly synchronizing the audio and the video tracks. Faced with the problem of synchronizing multi-camera shoots, when existing tools were unable to cope with my projects, I wanted to get rid of the arduous and tiresome task of syncing manually, so I. After getting a degree in IT, I worked for 10 years in video production, so I know all the nuances of a videographer and video editor’s work.
![]() ![]() Best Video Sync Software Mac OS X AndHow to Sync Audio and Video Correctly?The rule of the thumb is that, if the audio is played before the video, then that means we have to ‘add time’ to it (thus delaying it), so the video track can ‘catch up’ with the audio track. If not, click on the ‘Play’ button on ‘Avidemux’ window, so we can observe and see whether the audio comes before or after the video scenes. Also make sure to enable the option called ‘Shift’ (disabled by default), as it is the option that lets you change the audio/video sync setting (shown below).Any value that you enter here (‘Shift’) should be in milliseconds (1000 milliseconds = 1 second).Now, if you know what the correct audio/video sync value is then you can skip this and go directly into the end of ‘ Step 5‘. I just added this ‘update’ just to give some confidence to the readers.First of all, go to this page, download the package and install it (it has pre-built packages for Windows, Mac OS X and GNU/Linux).Now open ‘Avidemux’ program and load the ‘troublesome’ multimedia file into it.Before continuing, under the ‘ Video Output‘ and ‘ Audio Output‘ options, make sure it says ‘Copy’. Otherwise ‘Avidemux’ will not apply that setting to the playback.Note: This is just an example (of course) and depending on your multimedia file, you will have to figure out whether to use a negative or a positive value, but the procedure is just the same.Once you are satisfied with your new audio/video sync, now all you have to do is to save the changes. Then carry it on until you arrive at the optimal audio/video sync value.However, before every time you apply a different sync setting, first make sure to ‘Pause’ the playback, then add the new value and resume playback. And unless the sync was so big that you could easily tell that the audio came few seconds after the video, I recommend that you start by entering a small negative (say a ‘-100’ milliseconds) value first.If it fixes the lip-sync a little, then add another -100 (altogether ‘-200’ milliseconds). Then to make it play early, we have to enter a negative value. But there can be occasions where it requires one to enter higher values.Anyhow, unlike above, this time we have to add a negative value as the sync value, in order to make it load earlier (if you enter ‘-200’, then that means the audio will be loaded 200 milliseconds early).Let’s assume that the file you loaded had an audio track that was being played with a delay. However, in my experience, the usual range is 200 milliseconds to 2000 milliseconds (2 seconds). Download emulator on macI have been able to successfully save the corrected sync settings of certain MP4 files, by simply making that change alone!.Update 2: If that doesn’t work, then try changing the audio output from ‘copy’ to ‘MP3 Lame’. If this occurs, then I advice you to try selecting ‘ MP4v2 Muxer‘ rather than using the ‘ MP4 Muxer‘ (under ‘ Output Format‘). This does not concern the computer users as most popular players support playing the awesome MKV format.Update: Sometimes while trying to fix a MP4 file, though you might be able to successfully fix it and play it in ‘Avidemux’, the corrected sync value might simply be lost, after saving it into a new MP4. But most commercial hardware devices (iPad for example) will struggle to play it afterwards. If your input file has a different format than listed there, then you can choose ‘MKV Muxer’ as it supports storing a huge number of different audio and video codecs.Note: Please be aware that, if you put audio/video that were previously stored in an AVI file into a MKV container, then sure MKV will store them without any issues. If it was FLV, then choose ‘FLV Muxer’ etc.‘Avidemux’ doesn’t have like a huge list there, but it supports saving into AVI, FLV, MP4, MPEG-TS, MKV etc. Well, that is it!.Update: Some readers have complained that ‘Avidemux’ software is not always working for them when correcting the audio and video synchronization. I just have a gut feeling that this might work for all those of you who doesn’t seem to get an audio track in the output file after fixing the lip sync issue.Once all is done, from its menu click on: ‘File’ -> ‘Save’ to save the changes permanently.Depending on the length of the video, the time it takes will differ, but it should not take much longer (pretty much like copying that file over to somewhere else) since nothing gets re-encoded.When it is finished saving, you can open that file using any media player, and if the sync value you entered was correct, then it should be playable without any sync issues. I haven’t tried this, but someone called ‘John’ in the comment section let me know of this which has worked for him under Windows XP. However, that method only supports saving your input files (you can input almost anything into it AVI, MPEG, MP4, FLV …) into ‘MKV’, which as briefly mentioned above, is not playable on certain hardware based multimedia players.
0 Comments
Leave a Reply. |
AuthorLandon ArchivesCategories |