I have now performed tests on the MLV/RAW recording feature of the latest August 21 experimental build for the 100D. Here is what I found:
1) Silent module is missing, there is no FRSP recording. Was it removed intentionally? A work around this would be to keep two cards - a fast one with the August 21 build for MLV/RAW video and a second one, (does not need to be very fast), with the January 06 build for FRSP recording. I found that both cards can be swapped without problems and ML continues to work on the 100D with whatever card, (with its own build and settings on it), is inserted. This is a very cool feature since swapping cards takes just a few seconds but camera has to be turned OFF for card swaping. Question: Is this dangerous?
2) Video playback is not very stable. Sometimes it works just fine, upon pressing the playback button, sometimes it shows a frozen view of a frame, sometimes a corrupt frozen view and sometimes it shows a black screen. Usually, turning the camera off and on again fixes the issue for a few playbacks and then I get the same frozen views again. Also the blue horizontal menue line at the bottom of the screen during playback is missing, so deleting and exiting a clip during playback is no longer possible. Scrolling between subsequent clips back and forth using the scroll wheel does not work either. It worked on previous builds at 14 bits and was a very usefull feature for quick review of the last few clips on the screen.
3) Videos shot at higher resolutions , e.g. 2520x1080 in the 5x magnification mode show "hick-ups" during playback on the computer. At certain locations, video jumps back by a few frames and then continues again from there.
4) MLV sound does not work at all. When activated, upon pressing the record button the message: "Treads failed to start" appears on the screen. Turning camera off and on again and deactivating MLV sound allows further recording.
NOTE: MLV sound used to work in the January 6-th build that I used before. But, unfortunately, only with the first recording after camera is turned on. There was also a perfect synchronization between sound and video in that first recording. At the end of the second recording, a red line saying: "Audio failed to stop. State 4" appears. The third recording results in a "Treads failed to start" message and then camera freezes and needs a battery removal. A work around this situation was to turn camera off and on again with the mechanical switch after each MLV clip recorded with MLV Sound ON. In this way, a lot of time was lost between clips and important moments were missed.
If sound could be fixed with 10-bit MLV recordings this would result in 15-16 s. of RAW video recording with synchronous sound at the highest 1728x972 resolution in the normal and even the crop video mode in that resolution. This is all one could wish for in most shooting situations. What a camera, hey?