#8098: DTS audio to .mp4 sets wrong audio Channel(s) to 2
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Reporter: Dameos | Type: defect
Status: new | Priority: normal
Component: avcodec | Version: 4.2
Keywords: dts, channel | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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When writing a DTS audio track to a .mp4 container ffmpeg reduces the
audio channels to 2 instead of keeping the original channels.
Command:
{{{
ffmpeg -i C:\ffmpeg\audio.dts -map 0:0 -c copy C:\ffmpeg\audio.mp4
}}}
MediaInfo:
{{{
General
Complete name : C:\ffmpeg\audio.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/mp41)
File size : 2.26 GiB
Duration : 2 h 28 min
Overall bit rate : 2 173 kb/s
Writing application : Lavf58.31.104
Audio
ID : 1
Format : DTS
Format/Info : Digital Theater Systems
Format profile : MA / Core
Codec ID : mp4a-A9
Duration : 2 h 28 min
Bit rate mode : Variable / Constant
Bit rate : Unknown / 1 509 kb/s
Nominal bit rate : 2 170 kb/s
Channel(s) : 2 channels
Channel(s)_Original : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 kHz
Frame rate : 93.750 FPS (512 SPF)
Bit depth : 16 bits
Compression mode : Lossless / Lossy
Stream size : 2.26 GiB (100%)
Default : Yes
Alternate group : 1
}}}
As you can see all the audio stream data is still being written to the mp4
container, but Channel(s) is reduced to 2.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8098>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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