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19th May 2012, 13:29 | #1 | Link |
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Join Date: Jan 2009
Posts: 6
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MKV to MP4 audio video progressively out of sync
Hi,
I wanted to convert an MKV (with DTS) to MP4 (with AAC). This is what I did: 1) Use mkvtoolnix to extract the video (.H264) and audio (.DTS) - no problems here 2) Use eac3to to convert DTS to M4A (using NeroAACEnc) - no problems here 3) Use MP4Box to mux the .h264 file and .m4a file - problems!! After muxing, the audio and video are progressively out of sync. I checked the framerate of the MKV file, it is 23.976215. The MP4 has a framerate of 23.976023. Since the audio is the same length but videos have different framerates, it is causing the progressive out-of-sync. What is the solution? How do I use MP4Box to mux it at 23.976215 FPS? Even if I use the -fps 23.976215 option, it ends up being 23.976023! Else, how can I change the audio length? Please help! Thanks! |
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