Quote:
Originally Posted by madshi
Which movie is that? The warning means what it says: The ArcSoft decoder decodes this track correctly, but it lowers the volume a bit. You can more or less undo the volume change by adding "+3db" to the eac3to command line. However, perfect losslessness is lost in any case.
Why does ArcSoft lower the volume? Don't ask me. It's caused by the speaker mapping the studio has chosen. DTS-HD supports a big number of different speaker mappings for 7.1 streams. There are at least 3 different mappings the ArcSoft decoder decodes perfectly. But this specific speaker mapping used for this track seems to confuse the ArcSoft decoder, which makes it decode the track with lower volume. It's not a terribly bad thing, it's more or less similar to the effect DialNorm has. If you want, you can report this problem to the ArcSoft guys (together with a small sample). Should be easy for them to fix. Just ask them to decode the sample as 5.1 and then as 7.1. The 7.1 decoding volume will be lower, which doesn't really make any sense. With almost every other 7.1 track on the planet the 7.1 decoding volume is not lower. You can use "-logdts" to see which speaker mappings a specific 7.1 DTS-HD track uses...
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Sin City (Swedish).
So ArcSoft will lower all channels with 3dB during decoding?
I will try to find where I can send the ArcSoft guys a sample.
with logdts switch:
F:\>eac3to sample.m2ts 3: e:\sample.flac -logdts
+ DTS-Core
- frameSize 2012
- DTS-ES -
- channelNo 5
- lfe 1
- channelDescr 5.1
- samplingRate 48000
- bitDepth 24
- bitrate 1536000
- samplesPerFrame 512
- copyHistory 1
+ DTS-HD
- fullSize 84
- headerSize 32
- refClockCode 1/48000
- frameDurationCode 1
- activeMasks [1], [[1]]
+ Asset [0]
- fullSize 52
- headerSize 14
- corePackets Core
- extSubStrPackets XLL
- bitResolution 24
- maxSampleRate 48000
- totalNumChannels 8
- activeSpeakers C L R Ls Rs LFE Lsr Rsr ($4f)
M2TS, 1 video track, 2 audio tracks, 4 subtitle tracks, 0:00:26
1: h264/AVC, 1080p24 /1.001 (16:9)
2: AC3, 5.1 channels, 640kbps, 48khz
3: DTS Master Audio, 7.1 (strange setup) channels, 24 bits, 48khz
(core: DTS, 5.1 channels, 24 bits, 1536kbps, 48khz)
4: Subtitle (PGS)
5: Subtitle (PGS)
6: Subtitle (PGS)
7: Subtitle (PGS)
CAUTION: Decoding this track with ArcSoft results in low volume.