Converted a PowerPoint slide show to WMV. The WMV plays with no trouble. Audio begins at about 30 seconds as intended. I used Handbrake to convert to MP4 and now the audio starts right at the beginning. I tried adding 30 seconds of silence to the MP3 audio track, but have the same result: wmv plays fine, converted mp4 removes the silence and starts music at the beginning.
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Try decompressing the WMA stream with Lord_Mulder's wma2wav.exe.
If the resulting .WAV file includes the 30 seconds of silence at the beginning, then you can safely convert it to MP3, or AAC, or whatever.
WMP is not a good application, don't use it.
VLC is good at playing non-compliant and broken files...
but you shoudn't be creating broken files in the first place.
Last edited by Marsia Mariner; 23rd May 2017 at 16:21. Reason: damn typos :-/
Thanks for the reply Marsia. Extracted to wav using wma2wav.exe and the 30 second silence is there in the wav file. MP4s generated from HandBrake consistently show this oddity (WMP skips the silence/VLC plays it right).
Unfortunately I don't have control on what player will be used - the intent is to distribute this video to multiple people (about 70).
However, I found a method that results in an MP4 that plays nicely in both VLC and WMP. I converted the WMV using VLC "convert/save". WMP and VLC play the file correctly.
Last edited by Marsia Mariner; 23rd May 2017 at 17:39. Reason: need more coffee
Never use WMV for an intermediate file -- that's just asking for trouble. It uses variable frame rates and that can confuse a lot of applications.