VideoHelp Forum

Our website is made possible by displaying online advertisements to our visitors. Consider supporting us by disable your adblocker or Try ConvertXtoDVD and convert all your movies to DVD. Free trial ! :)
+ Reply to Thread
Results 1 to 4 of 4
Thread
  1. Hi! I've recorded a bunch of channels with my DVB-T box and it exports in .MTS.

    The editing goes very well in Avidemux but when I export it, in the very beggining of the video, it leaves a 0.5 second non-recorded. The original recording is perfect.
    Is this a problem with Avidemux? Or with the recording?

    Here's an example: http://www88.zippyshare.com/v/qSmeSpCq/file.html Notice that at 00:00 it contains audio before the cut.
    Quote Quote  
  2. There doesn't seem to be anything particularly odd about your sample to me. I tried a few different players (MPC-HC, VLC, Potplayer) and there was no noticeable delay for video or audio.

    Best as I could tell looking at the MP4, because I know very little about MP4, there's an 80ms video delay. When I remuxed the MP4 as an MKV with MKVToolNix and checked it, and the MKV had the same 80ms delay for the video, but at 25fps, 80ms is only the duration of two frames, so it shouldn't be a problem.

    ffdshow's on screen display agrees (see attached image). For a constant frame rate the first frame is frame zero, and frames are effectively counted even if they don't exist, which is why the first frame I see appears as frame number two beginning at 80ms.

    You could try setting an 80ms delay for the audio. Then the video and audio delays should cancel each other out, but it might mess with the audio sync. I've no idea why Avidemux is setting an 80ms video delay. I don't use it. Maybe your source file has the same video delay and Avidemux isn't changing it, even when you edit.

    As you can see from my screenshot below, MPC-HC isn't displaying your sample with the correct aspect ratio. Neither did MPC-BE. VLC and SMPlayer did. I suspect Avidemux is only writing the aspect ratio to the video stream and MPC-HC seems to look for the container aspect ratio (MP4, or MKV aspect ratio etc). That's probably a MPC-HC issue if anything, but I'd try opening your output file with MyMP4Box (or MKVToolNix) and setting the correct 16:9 display aspect ratio so the video stream and container aspect ratios are the same.
    Image Attached Thumbnails Click image for larger version

Name:	mpc-hc.gif
Views:	168
Size:	142.8 KB
ID:	42216  

    Quote Quote  
  3. There are 2 streams. hello_hello is probably listening to English. OP is probably not. The Portugese stream has a delay offset and has a "blip" from the previous scene. You can solo each track and listen to the separately

    Did you cut on keyframes in avidemux ?

    I suspect they were already offset like that to begin with. You can try "fixing" it with an audio shift of the Portugese track, assuming the English track is the one in sync
    Image Attached Thumbnails Click image for larger version

Name:	audacity.png
Views:	120
Size:	82.5 KB
ID:	42217  

    Quote Quote  
  4. Member netmask56's Avatar
    Join Date
    Sep 2005
    Location
    Sydney, Australia
    Search Comp PM
    Download the trial version of TSDoctor and let it process and demux it for you. Then remux together with the audio of your choice.
    BeyonWiz T3 PVR ~ Popcorn A-500 ~ Samsung ES8000 65" LED TV ~ Windows 7 64bit ~ Yamaha RX-A1070 ~ QnapTS851-4G
    Quote Quote  



Similar Threads