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Hack This! – 5D Mark II Audio Control Gain Disabled!

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From Cinema5D

5d mark ii1 - Hack This! - 5D Mark II Audio Control Gain Disabled!
Hax0red!

If Canon isn’t going to do this stuff, others appear very motivated to do so.

“As an early goal, I have disabled the AGC for on the AK4646 audio chip that the 5D uses by overriding the sound_dev_task() at 0xFF856E60 to call audio_set_alc_off() at 0xFF856B14. The level is much too hot due to the wrong levels selected (it defaults to max gain?) but there is no shift in quiet scenes anymore. This is an easy first step that provides a proof-of-concept modification for the 1.0.7 firmware.

I can also log the audio levels as they are being sampled, which will make it possible to do on-screen level meters at some point in the future. My next step is figuring out how to add menus for the AGC disabling, then tackling the MVR_start_record() and LVAE_* functions.”

Read Here: http://www.cinema5d.com/viewtopic.php?f=14&t=2477

Hack in progress

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26 responses to “Hack This! – 5D Mark II Audio Control Gain Disabled!”

  1. Nikon people are complaining about no manual control as well, just not as loudly because even with manual control the video on the d90 and d5000 would suck.

  2. “I can also log the audio levels as they are being sampled, which will make it possible to do on-screen level meters at some point in the future.”

    Hey!!! Having the recording levels in a log side by side of a PCM audio (whatever the format is) could lead us to kind of “RAW audio” like “RAW image” format, so you can modify it later in kind of “SoundRoom”, like in “LightRoom”.

    Mmmmh… by the way… how about a “RAW video” for movie recordings like “RAW image” format having the exposure, gamma and other “automatic suggestions” logged to be later adapted in a forthcoming “MovieRoom”?

  3. I am glad to hear something is going on. The video mode is helping photographers to get video sequences where they would’nt get video material. Why not manual control? CANON ARE YOU STILL SLEEPING?

    A videographer would buy a camcorder for his work. The Eos 5DMK2 isn’t in competition with camcorders.

    Please help us doing our work with the best tool available.

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