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Old 13th June 2019, 03:14   #1  |  Link
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AVCHD Maximum Bit Rate For DVDs

I have read when AVCHD is recorded on a DVD, the disc's maximum spin speed limits the data rate to 18Mb/s. However, this info was printed circa 2009.


https://vision.unipv.it/mst/mat/Sony_AVCHD.pdf <== AVCHD Specifications on page 7.

My Panasonic video camera records AVCHD into a BDMV folder and to this format:

Format: AVC
Format/Info: Advanced Video Codec
Format profile: High@L4.2
Format settings: CABAC / 2 Ref Frames
Bit rate mode: Variable
Bit rate: 23.8 Mb/s
Maximum bit rate: 25.0 Mb/s
Width: 1920 pixels
Height: 1080 pixels
Frame rate: 50.000 FPS
Colour space: YUV
Chroma subsampling: 4:2:0
Bit depth: 8 bits
Scan type: Progressive

Maximum Overall bit rate with audio: 28.0 Mb/s

My Pioneer Blu-ray player is about 5 years old, and I burnt the BDMV folder to a DVD and the Pioneer played it with no problems.

My question is, have they changed the AVCHD specifications in this day and age. Are later Blu-ray player able to read a DVD faster? How far can I push the maximum Overall bit rate?
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Old 13th June 2019, 07:43   #2  |  Link
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I don't think that the specs have changed. AVCHD on DVD medium is a subset of the broader AVCHD standard. Your blu-ray player probably complies with the full AVCHD standard (check the datasheet), however there is no warranty for playing DVD discs (4.7 or 9 GB) with AVCHD material which exceeds the "AVCHD on DVD media" specs. It may work in your case but it may fail in other cases (other DVD brand, other player). It's probably safer to burn your AVCHD material on BD25 discs. That's how I see it.
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Old 14th June 2019, 10:31   #3  |  Link
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Location: Germany
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It's not what AVCHD requires, but what the drive reading DVDs can.

Double standard drives (BD+DVD) can read higher bitrates from the same DVD than pure DVD drives, for they have been designed for a max. 18Mbps (double the DVD specs). BTW, these are the specs for pressed media, not for recordable ones, since the bitrate reqs for the latter are lower. Double sided recordables should consider a further reducing of the bitrate.

Now, that BDRs are so cheap and DVDRs with AVCHD pose some issues with some players, why insisting on BD5/BD9?
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