- #VLC AUDIO SYNCHRONIZATION HOW TO#
- #VLC AUDIO SYNCHRONIZATION MP4#
- #VLC AUDIO SYNCHRONIZATION PROFESSIONAL#
Then under ‘Tracks, chapters and tags’ field, select the audio stream/track (shown below is an example). Now open ‘MKVToolNix’ and load the ‘troublesome’ file into it. If it is a negative/minus one, then you should enter a minus sign before entering the value in ‘MKVToolNix’, more below) and close VLC. Once you have found it, simply take a note of it (note that depending on the file the value could be positive or a negative one. So as a general rule, play with ‘j’ and ‘k’ keys, until you find the perfect sync value for that multimedia file. So keep doing that until you come up with the perfect sync value. If after doing that it seems to shorten the ‘gap’ then it is an indication that you are on the right track. Again, to feel its effect, you might have to press it a few times. A single click increases the value by 50 milliseconds only, so unless the ‘gap’ is very small, you will have to press it a few times to get see its effect.Īnyhow, if after pressing ‘j’ key for a few times it worsens the ‘gap’, then it is an indication that you actually have to make VLC play the audio track a bit behind (delay) the video. This will make VLC play the audio track a bit ahead of the video. Then simply press the ‘j’ key on your keyboard. So open your ‘troublesome’ file in VLC, and let it play for a few seconds. Then we will simply enter that sync value into ‘MKVToolNix’ and save it as a new MKV file so that it is saved permanently. First we are going to play the ‘troublesome’ file in VLC (or any other player that lets you change the sync temporarily) and we will try to identify the proper sync value. I also recommend that you use VLC because both these utilities are available for multiple operating system platforms, so you can use this ‘guide’ in any of them. Note: Make sure you have downloaded and installed the latest builds of ‘MKVToolNix’ from here. Computer users however do not have to worry about it as popular players (VLC, MPC, PotPlayer, SMPlayer, KMPlayer …) support it.
#VLC AUDIO SYNCHRONIZATION MP4#
While doing so this tools also lets you pass certain settings (sync, fps, aspect ratio …) and it is through that we can attempt to fix sync problems.īut please be aware that the only output format it support is MKV (and few of its variations such as ‘MKA’ for audio’, ‘MKS’ for subtitles etc) and unlike MP4 or AVI, MKV is not supported by a lot of commercial and strictly hardware based multimedia players. ‘MKVToolNix’ is not an encoder as you can only use it to ‘extract’ audio/video/subtitle tracks from other containers (MP4, AVI, FLV etc) and put them into the powerful and open-source MKV container. In any case, there are few other tools that you can try while trying to fix a sync ‘malfunction’, and ‘MKVToolNix’ is one among them. ‘Avidemux’ can do very little if the input file itself has some issues (corrupted video frames etc) but ‘Avidemux’ is also a bit buggy, so some of the blame goes toward it also. Now to be honest, I too have come across some of these problems but fortunately I have been able to fix them (so far).
#VLC AUDIO SYNCHRONIZATION HOW TO#
In a previous post I wrote about how to fix some of these synchronization issues permanently using ‘Avidemux’, but since then I have received few complains of ‘Avidemux’ not being able to fix those issues in some cases.
#VLC AUDIO SYNCHRONIZATION PROFESSIONAL#
Multimedia files with ‘lip-sync’ issues are not so uncommon, although it happens very rarely in professional environments as they take extra precautions to avoid them.
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