AVIDEMUX: What output mode ?

[GoodEnough]

I wanted to slice down an .mp4 file to post on Youtube.
When I use the defaults, I get audio, but video.

I should keep video output as copy, right?

Here are my output format choices. Which do I use?

 

[TheELF]

Is it a small clip?
Basicaly you have to cut on I-frames ,the little arrows at the bottom only skip to those,if you want to cut on a different kind of frame you will have to recode the whole thing
(or cut out a slightly bigger piece so you will only have to recode this part and join it back in)
otherwise the video will skip to the next correct i-frame,depending on the encoding and the duration there might be no other, thous no video.

 

[Gooberlx2]

Choose the mp4 muxer. But as above, you need to jump to the iframe nearest-but-before your desired cut point, or recode the whole thing (which youtube will probably do anyway). You can further trim the video on youtube after uploading if needed.

 

[GoodEnough]

Is it a small clip?
Basicaly you have to cut on I-frames ,the little arrows at the bottom only skip to those,if you want to cut on a different kind of frame you will have to recode the whole thing
(or cut out a slightly bigger piece so you will only have to recode this part and join it back in)
otherwise the video will skip to the next correct i-frame,depending on the encoding and the duration there might be no other, thous no video.

I have no idea what you're trying to say.
The question was "Which option do I pick"

Choose the mp4 muxer. But as above, you need to jump to the iframe nearest-but-before your desired cut point, or recode the whole thing (which youtube will probably do anyway). You can further trim the video on youtube after uploading if needed.

I chose A and B as the start and end point of the "cropped" clip.
I chose MP4v2 Muxer and I was able to get audio and video correctly.