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Plyback of stream sounds veeery (s)low

Hello,

we are having an issue with the playback of audio.

We add a clip to the timeline (specs below) - and the YouTube stream (1080p30 x264 recommended 4.5Mbps) plays back very slow - that is reproducible with various clips. a change of samplerate does not change anything (44.1kHz to 48kHz).

Voices sound like being pitched down 3 octaves.

The only solution that works, is re-encoding the clip.

Then demuxing vid/audio, copying the video, converting the embedded audio (HE AAC /LC) into mp3 and remuxing again.

Does anyone have a clue what this issue might cause or had a similar issue?

 

Input Clipfile_1500.mp4 in Timeline:
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (isom)
File size                                : 7.26 MiB
Duration                                 : 38 s 869 ms
Overall bit rate mode                    : Variable
Overall bit rate                         : 1 567 kb/s
Encoded date                             : UTC 2017-08-21 10:25:18
Tagged date                              : UTC 2017-08-21 10:25:18

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings, CABAC                   : Yes
Format settings, RefFrames               : 2 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 38 s 760 ms
Bit rate mode                            : Variable
Bit rate                                 : 1 473 kb/s
Maximum bit rate                         : 3 000 kb/s
Width                                    : 960 pixels
Height                                   : 540 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)                       : 0.114
Stream size                              : 6.81 MiB (94%)
Language                                 : English
Encoded date                             : UTC 2017-08-21 10:25:18
Tagged date                              : UTC 2017-08-21 10:25:18
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio
ID                                       : 2
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format profile                           : HE-AAC / LC
Codec ID                                 : 40
Duration                                 : 38 s 869 ms
Bit rate mode                            : Variable
Bit rate                                 : 96.0 kb/s
Maximum bit rate                         : 169 kb/s
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 kHz / 24.0 kHz
Frame rate                               : 23.438 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 449 KiB (6%)
Language                                 : English
Encoded date                             : UTC 2017-08-21 10:25:18
Tagged date                              : UTC 2017-08-21 10:25:18

 

Best regards, Nico

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