FWIW - some more information -
Zoom Q2HD can record video with L-PCM - I've done it with 24-bit 48kHz.
MediaInfo -
General
Complete name : G:\DCIM\100_ZOOM\ZOOM0004.MOV
Format : MPEG-4
Format profile : QuickTime
Codec ID : qt
File size : 3.67 GiB
Duration : 59mn 5s
Overall bit rate mode : Variable
Overall bit rate : 8 881 Kbps
Encoded date : UTC 1980-05-10 03:43:13
Tagged date : UTC 1980-05-10 03:43:13
AMBA :
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Format settings, GOP : M=3, N=15
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 59mn 5s
Bit rate mode : Variable
Bit rate : 6 571 Kbps
Maximum bit rate : 9 900 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.238
Stream size : 2.71 GiB (74%)
Title : Ambarella AVC / Ambarella AVC
Language : English
Encoded date : UTC 1980-05-10 03:43:13
Tagged date : UTC 1980-05-10 03:43:13
Audio
ID : 2
Format : PCM
Format settings, Endianness : Little
Format settings, Sign : Unsigned
Codec ID : in24
Duration : 59mn 5s
Bit rate mode : Constant
Bit rate : 2 304 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Delay relative to video : -33ms
Stream size : 974 MiB (26%)
Title : Ambarella AAC / Ambarella AAC
Language : English
Encoded date : UTC 1980-05-10 03:43:13
Tagged date : UTC 1980-05-10 03:43:13
Maximum File Size -
This is for the maximum file size (due to FAT32 format limit)
video with 24-bit 48kHz PCM audio gives just under 1 hour.
This particular file name was: ZOOM0004.MOV
the Q2HD automatically created and continued a file named: ZO010004.MOV
Usability -
The Q2HD always defaults to video recording -
to record audio only have to specifically set it via the menu.
Battery life -
I got 3hours 8mins from using just under 1900mAh -
so that is about the time limit for video using say 2000mAh eneloops
or just under 4hours using 2400mAh eneloop XX or Duracell Ion-Core (re-badged eneloop XX)
Video Compatibility -
Even though the resultant video could be played with WMP (Windows Media Player) and Media Player Classic
it was not easy to edit/trim - none of the video editors I had could do it
(including
VirtualDub,
AviDemux).
Video Editing -
I had to use
MediaCoder to convert the audio to an acceptable format for MP4 - like AAC at 320k (highest quality limit) and save to .MP4 container
before the video could be edited with the likes of VirtualDub or AviDemux.
Extracting Audio -
Again had to convert the file to .MKV using MediaCoder (copying both video and audio streams)
then used
MKVextractGUI2 to exact the audio.
Note: even though MediaCoder can extract audio - it converted the audio to 16-bit regardless of the requested output format -
even if "Original" bit-depth or 24-bits were specified.