[nwtim]

I grabbed 10 audio fragment files and renamed them to 1,2,3,etc and was able to "join" them with AdobeHDS.php. It still created a file named Joined.flv, but I wasn't able to hear anything despite VLC being able to "play" it.

MediaInfo says this about it:

General
Complete name : E:\My Documents\Downloads\dTa\Test\Joined_101-110_Audio.flv
Format : Flash Video
File size : 423 KiB
Duration : 59s 954ms
Overall bit rate : 57.8 Kbps

Audio
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : HE-AAC / LC
Codec ID : 10
Duration : 59s 954ms
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz / 22.05 KHz
Compression mode : Lossy

I joined the 10 video fragments that should match the audio fragments and MediaInfo reports:

General
Complete name : E:\My Documents\Downloads\dTa\Test\Joined_101-110_Video.flv
Format : Flash Video
File size : 24.7 MiB
Duration : 1mn 0s
Overall bit rate mode : Constant
Overall bit rate : 3 454 Kbps

Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : 7
Duration : 1mn 0s
Bit rate mode : Constant
Bit rate : 3 450 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.150
Stream size : 23.7 MiB (96%)

I see there's a small difference in the duration of the files, so muxing them - if it's even possible - would likely end in a slight offset - and that may very well be where the keyframes come in.

I'm not really sure where to go from here other than seeing if there's some way to mux them together.