Only crop mpeg1 file with ffmpegx

[Paedar]

Hi all,
I have a small video-clip (mpeg1videi) which have unfortunately that black bars at the top and the bottom. So I've tried to ONLY crop the clip without changing the codec. Cropping with coding works fine . Does anyone knows how that works with ffmpegx?
Thanks for you help
Peter

[Case]

If you crop with ffmpegX, the movie will be decoded and re-compressed, even for the same codec.
The mpeg2enc engine doesn't allow cropping, so you'll have to use the ffmpeg engine.
If decoding with QuickTime is selected, then the cropping is ignored, so uncheck that.

If you elaborate on what you want to do with this cropped clip, that could help in giving advice.
Also, what are the source file specs, e.g. as presented in the Summary tab.

[Paedar]

Hey,
thaks for your effort - but I just wanted to crop WITHOUT decoding and recompressing - mostly you loose informations! I found a little description for cropping with QT Pro - that works for me.

If anyone is interessted in this, here's the link:
http://www.youtube.com/watch?v=HKS9wgmZ9Mw

[tomlee59]

The method you've linked to creates a QT movie, not an MPEG1 movie. It will produce the right result when played back by a QT-aware application. However, if you had wanted a true MPEG1 movie playable by other than QT, re-encoding could not have been avoided. Glad that you found a method that worked for you, but your original post was vague about playback requirements, and so Case gave you the most generally correct advice. You cannot crop an MPEG file -- and have it remain an MPEG file -- without reencoding.