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2756 posts

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  Reply # 878667 15-Aug-2013 11:45
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Its probably best to work out if either one of these methods will actually result in a *fix* for you and then work out the logistics of a mass conversion - baby steps....

If re-encoding the audio stream *fixes* the issue then you have a handle on what needs to be done with your files.

If migrating them to an mkv container (mkvmerge) *fixes* things (without having to re-encode - pretty sure this process doesnt require re-encoding) then that would probably be the fastest.

You can then work out some bulk ways of tackling the fix.

You have actually learnt quite a lot already - Thats usually quite fun - especially if you work out a fix.

Pretty sure mkvmerge (gui version) lets you just open up an avi file and convert it to an mkv file - might give it a try when I am at home later in the day....




Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler



24 posts

Geek


  Reply # 878730 15-Aug-2013 12:44
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I finally found http://www.fosshub.com/MKVToolNix.html and downloaded the program.

This gui version is brilliant. !!!

All I did was install the program, start the gui, drag a file into it and it saved the output to the same folder with the mkv extension in 40 seconds which mkv file then played on my pvr with no a/v sync problems anymore.

You guys are amazing to have stuck with me through all this learning exercise and my newbie-ness!.

I have learned a lot but probably more about my attitude response to issues i don't understand, because i started off with a negative attitude towards the pvr but now i know a bit better what I have got and what it can do for me.

Many thanks again to you all.


216 posts

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  Reply # 878911 15-Aug-2013 15:33
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Quick lesson then...

A video file is commonly made up of a number of streams, usually one video stream (although some containers allow for more), one or more audio streams and one or more subtitle streams. These are logically separate from each other, and packed into a container.

Each stream is encoded with e codec, this is what compresses the stream small enough to be useful for mortals who don't have infinite storage or bandwidth.

Various audio codecs are: pcm (not compressed, pretty much the same as CD audio), mp3, aac, DTS, AC3.

Various video codecs are: mpeg2 (eg Sky/Freeview satellite, DVD), mpeg4 part 2 (eg divx or xvid), mpeg4 part 10 aka h264 (eg most blurays, Freeview terrestrial).

Various containers are: avi, mpg, mp4, mkv

Audio sync can go wrong a number of ways, there is an article here http://en.wikipedia.org/wiki/Audio_to_video_synchronization

The process of putting a number of streams in a container is called  muxing. Taking them out again to decode and play them is demuxing.  Muxing and demuxing is not processor intensive. The hard work is encoding and decoding. mkvmerge in this case simply demuxes from the avi container and muxes to a mkv container, and somewhere along the line is improving the audio sync.

2756 posts

Uber Geek
+1 received by user: 549


  Reply # 879290 16-Aug-2013 09:22
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Good to know you are all sorted Jiranz.

Geekzone is a good place to get help - and if you know something its a good place to give help as well.




Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler



24 posts

Geek


  Reply # 879386 16-Aug-2013 11:21
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Marvellous!
I did a huge Batch conversion last night using the BAT files they provide and it all went smoothly and the formerly problematic files play without fault this morning.
After all the hassle and when I finally grasped the real issues as they were explained to me, the final solution was so easy!
I am so grateful for the help I received here!
You should all pay yourselves an early Christmas bonus!



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