audio / sound issue on 1 of 3 cards recorded
We have encountered an audio recording anomaly and looking for input/help. Groups of clips on the second card recorded in a day have no audio with the clip file, although audio was recorded - a mix on Channel 1 and camera mic on Channel 2. We know that the camera had audio hitting the inputs, as we had confirmation through the headphone return and confirmation through the level displays on a field monitor. Also, the camera was on a crane, so the inputs were not accessible or touched during the shoot day. Even if Channel 1 was not being fed, the camera mic on Channel 2 should be there regardless of what the sound tech was sending - and there's nothing on Channel 2 - no Channel 1 or 2 at all.
The problem appears something like this:
all clips on first card [16GB] have good audio
first clip on second card [16GB] (#247, approx. 6 minutes) NO AUDIO TRACKS
next three clips have audio (#248, 249, 250)
next eight clips - NO AUDIO TRACKS (#251-258)
next five clips have audio (#259-263)
next ten clips - NO AUDIO TRACKS (#264-273)
-end of second card-
all clips on third card [16GB] have audio
Where the audio is missing, the picture is fine.
All 3 cards were formatted before the shoot, all three cards are 16GB. All three cards were transferred at the end of shoot day on a laptop. Additional footage from another EX-1 was downloaded in the same session, and those clips all have good audio. The person transferring the footage "cloned" the volume, I'm trying to get a copy of the material (bpav.files). He indicates there is no audio on the raw files, so it sounds like trying the transfer again will not bring back the audio. The suspect card was re-formatted a day later in preparation for another shoot, so the original material does not exist. [A lesson to have a transfer protocol which includes checking ALL your clips before re-formatting]. A spot check showed that audio was fine, when it was actually missing on random groups of clips.
An initial inquiry to Sony gets the response of "you have a corrupted card - reformat."
Well, yeah the card has been reformatted, but why wasn't audio recorded on some clips on the previous recording?
Is it possible for the EX-1 to record good video with corrupted audio or to leave off the audio entirely?
Is the recording of audio and video mixed together in a single stream, or is there a separate audio component?
Any advice or experience from other users would be much appreciated.
Thank you, Kim