![]() It seems to me that the confusion over the SUPER “stretch it” command is related to the function of what it turns off in FFMpeg rather than what it turns on. Since SUPER is only the front-end for for ffmpeg, I’m trying to understand how to run ffmpeg in one case, or the other, and skip using SUPER. The problem is that SUPER offers only small frame sizes for encoding to 3GP (maximum 356×288) and I need to encode to higher resolutions than that. After I run mp4box, all players run the clip letterboxed but at the correct 2.39:1 resolution. If I encode the clip in SUPER with the “Stretch It” box unchecked, at the same 4:3 aspect ratio, the resulting clip is 4:3 image (not the source 2.39:1), but all the players add black bars top and bottom. However, QuickTime Player, WMP, CorePlayer and other players ignore the aspect ratio field and play the clip at the 4:3 aspect ratio, derived from the frame resolution. ![]() The modified clip is played at 2.39:1 by players which can read the aspect ratio field from the 3GP file header (VLC Player, KMPlayer and SMPlayer cand do that). That output I can then modify with mp4box command: mp4box -par 1=”67:38″ clip.3gp. ![]() The resulting image is stretched on all the frame. I encode a video clip with an aspect ratio of 2.39:1 to a 4:3 frame size using SUPER with the “Stretch It” box checked. Maybe I should explain in more detail what I’m trying to do.
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