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Odd Video problem – need advice on re-encoding…
Hi all,
I’m struggling with a video conversion that I need to do.
We have a short 3 minute video that we’ve produced, but when played back on our Corporate intranet over most user’s PCs – almost all the speech in the file is inaudible, just the background music. We’ve tested the video over stereo headsets, speakers etc and all is fine. However, lots of users in our business use mono USB Plantronics headsets, and it’s these users who are struggling. I’ve tried many different formats and still have this issue.
We are requested by our IT dept to use FLV format for video wherever possible.
I’ve run a video I know works fine against our own video using iMedia HUD app on my Mac to compare the codecs etc, and these are the results:
WORKING VIDEO
quad1.flv
Format : Flash Video
File size : 62.5 MiB
Duration : 3mn 45s
Overall bit rate : 2 324 Kbps
Writing application : Lavf52.84.0Video
Format : Sorenson Spark
Codec ID : 2
Duration : 3mn 45s
Bit rate : 195 Kbps
Width : 450 pixels
Height : 300 pixels
Display aspect ratio : 3:2
Frame rate mode : Constant
Frame rate : 25.000 fps
Bit depth : 8 bits
Bits/(Pixel*Frame) : 0.058
Stream size : 5.25 MiB (8%)Audio
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Mode : Joint stereo
Mode extension : MS Stereo
Codec ID : 2
Codec ID/Hint : MP3
Duration : 3mn 45s
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 2 channels
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 3.44 MiB (6%)
Writing library : LAME3.98.4NEW VIDEO (Non-Working)
Virgin_Kon_v8.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 34.9 MiB
Duration : 2mn 20s
Overall bit rate : 2 078 Kbps
Encoded date : UTC 2012-07-09 15:38:42
Tagged date : UTC 2012-07-12 07:25:56Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L3.0
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2mn 20s
Bit rate : 1 915 Kbps
Width : 640 pixels
Height : 360 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) : 0.332
Stream size : 32.1 MiB (92%)
Language : English
Encoded date : UTC 2012-07-09 15:38:42
Tagged date : UTC 2012-07-09 15:38:44
Color primaries : BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M
Transfer characteristics : BT.709-5, BT.1361
Matrix coefficients : BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170MAudio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 2mn 20s
Bit rate mode : Constant
Bit rate : 160 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Stream size : 2.69 MiB (8%)
Language : English
Encoded date : UTC 2012-07-09 15:38:42
Tagged date : UTC 2012-07-09 15:38:44Can anyone offer any advice – I would like to convert it to match (or get close) in Premiere Pro CS6 but I’m not sure of how to get these settings as I’m a bit of a Premiere newbie.
Just for clarity – the video plays perfectly well, it’s just the audio we are having issue with. It’s played via FlowPlayer on our SharePoint intranet. This is the first video we have had this issue with.
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1 Reply
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I wonder if it’s your audio tracks and not the encoding.
I’m NOT an audio guy, but I know if you mix the exact same audio on two tracks, with the phase on one side inverted, you’ll get something similar to what you describe… the trick can actually be used to create a simple karaoke track from standard recordings. For whatever reason the two tracks cancel out at certain frequencies (same theory behind noise reduction headphones and the like), but it seems to focus more on the frequencies including human voices and leave quite a bit of the music behind.
Now how an issue like that could wind up in your program I have no idea. I may be way off base here, and I’m sure someone else could speak with more accuracy, but that’s where I’d start. Have you tried monitoring from the edit station with all tracks centered (mono)? Or playing your initial output file in the same manner, before encoding to the delivery format?
-Adam
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Video Photographer / Avid & Final Cut Editor
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