If Chroma Keying with h.264, in my experience, the recording work has to be done almost perfectly in order to get good results.
First of all, I would like to mention that Cinestyle can be your downfall in this matter. If you are chroma keying with cinestyle, the scene might simply be too flat for your software to be able to exclude the green screen. Same goes for landscapes and cinestyle, if there is no contrast in a scene and you record with cinestyle, you risk ruining the footage as it will be hard to pull back all the details that differentiate in contrasts.
Do what kihlbahkt said, bump up the green channel and if possible in your software, start a new layer after for further adjustments.
2nd: Filming a green screen.
Its imperative that you keep some distance between your talent and the greenscreen to avoid green reflective spill on your talents hair, shoulders etc. Atleast 3-4 meters when the greenscreen is lit up by controlled light.
And with h264 its very important that your greenscreen is evenly lit as the codec is so compressed that small variations in lighting can easily make artifacts that can require masking to remove, which is a pain when it could have been avoided.
and last.. Try doing this in RAW and save your self a headache
Good luck!
First of all, I would like to mention that Cinestyle can be your downfall in this matter. If you are chroma keying with cinestyle, the scene might simply be too flat for your software to be able to exclude the green screen. Same goes for landscapes and cinestyle, if there is no contrast in a scene and you record with cinestyle, you risk ruining the footage as it will be hard to pull back all the details that differentiate in contrasts.
Do what kihlbahkt said, bump up the green channel and if possible in your software, start a new layer after for further adjustments.
2nd: Filming a green screen.
Its imperative that you keep some distance between your talent and the greenscreen to avoid green reflective spill on your talents hair, shoulders etc. Atleast 3-4 meters when the greenscreen is lit up by controlled light.
And with h264 its very important that your greenscreen is evenly lit as the codec is so compressed that small variations in lighting can easily make artifacts that can require masking to remove, which is a pain when it could have been avoided.
and last.. Try doing this in RAW and save your self a headache
Good luck!