Join .FLV + .MP3 (remove 16sec audio lead)

[mahjohn]

I have an 850MB .flv from a webinar, and a 35MB .mp3 audio track to go with it. The problem is the audio leads the video by 16 secs throughout. I've been playing with this for a few weeks, converting the .flv to .mkv, or .mp4, but still unable to really get them joined and remove the 16sec audio lead.

What is the best method to accomplish this? I've played with several options and software packages, but would rather someone tell me what I should be doing vs....trial and error on my part.


thanks

[Baldrick]

Add 16 seconds silence to the audio clip with an audio editor like audacity. Then join/multiplex to a new file.

[mahjohn]

stupid question here....but, if the audio leads the video by 16secs, would adding 16secs of silence make the audio 32secs ahead of video, or would it now align with the video?

[Baldrick]

You are adding a 16sec delay for the audio when you add the silence at the beginning.

[Budman1]

I did a test with FFMpeg using an MKV video and an MP3 audio and joined and resynced (delaying audio 16 seconds) all in one :

ffmpeg -i "path\pathe\video.mkv" -itsoffset 16.0 -i "path\pathe\audio.mp3" -map 0:0 -map 1:0 -vcodec copy -acodec copy "path\pathe\output.mkv"

You might try that if you have FFMpeg on your computer. It should not have to reencode with the codecs set to copy.

[mahjohn]

thank you both....worked out well in both scenarios.