Loosing sound quality after export

Hi there,

First please tell me if I'm not understandable, I'm not a native english speaker ;).

I'm editing a video which is just someone speaking with discreet music in the back. I used a little guitar microphone as a tie-clip microphone, and on the record it was a very good quality, at least it was enough for me (I think it has nothing to do with my problem, but you never know..). Once exported on hitfilm it was perfect as well. As sound work I just payed attention to have no peaks above - 6/7db.

But when I export the final video with the Youtube 1080HD preset, the voice becomes like saturated, I don't know how to describe it really, but anyway it's really not the quality I had when editing !

I tried to edit the preset to increase the audio bitrate, but the result is still bad.

Any idea ? Thanks in advance :).

Comments

  • Can you post some before-and-after footage so we can hear the difference for ourselves?  As you say, describing sound differences can be difficult.  Hearing the actual difference might help us pinpoint the problem more quickly and accurately.

  • Triem23Triem23 Moderator

    Also, download and install MediaInfo https://mediaarea.net/en/MediaInfo/Download

    Copy and paste here a "Tree" report of a source file and your output file. This gives specific details on the files. 

    @jsbarrett $5 sez the initial file is a screencap or other low-quality, high-compression file that won't stand up to recompression. ;) 

  • @Triem23 Good catch on MediaInfo. I keep forgetting that for situations like this. Then again, I've been up all night editing, so there's lots of fog in the nog right now.

  • edited November 10

    Edit : see the last message, my problem is solved :)

    Thanks for helping : ).

    So here is the Media Info report.

    For the sound source file (it was recorded separately from the video) :
    Format : MPEG Audio
    File size : 20.1 MiB
    Duration : 21 min 34 s
    Overall bit rate mode : Variable
    Overall bit rate : 131 kb/s
    Writing library : LAME3.99r

    Audio
    Format : MPEG Audio
    Format version : Version 1
    Format profile : Layer 3
    Duration : 21 min 34 s
    Bit rate mode  : Variable
    Bit rate : 131 kb/s
    Minimum bit rate : 32.0 kb/s
    Channel(s) : 1 channel
    Sampling rate : 44.1 kHz
    Frame rate : 38.281 FPS (1152 SPF)
    Compression mode : Lossy
    Stream size : 20.1 MiB (100%)
    Writing library : LAME3.99r
    Encoding settings : -m m -V 0 -q 0 -lowpass 22.1 --vbr-mt -b 32


    And for the final video after export :
    Format : MPEG-4
    Format profile: Base Media / Version 2
    Codec ID : mp42 (isom/mp42)
    File size: 433 MiB
    Duration: 3 min 57 s
    Overall bit rate mode : Variable
    Overall bit rate: 15.3 Mb/s
    Encoded date : UTC 2017-11-06 09:23:37
    Tagged date : UTC 2017-11-06 09:23:37

    Video
    ID : 2
    Format : AVC
    Format/Info  : Advanced Video Codec
    Format profile : High@L4.2
    Format settings: CABAC / 3 Ref Frames
    Format settings, CABAC  : Yes
    Format settings, ReFrames  : 3 frames
    Codec ID : avc1
    Codec ID/Info  : Advanced Video Coding
    Duration : 3 min 57 s
    Bit rate mode : Variable
    Bit rate  : 15.0 Mb/s
    Maximum bit rate : 16.0 Mb/s
    Width : 1 920 pixels
    Height  : 1 080 pixels
    Display aspect ratio  : 16:9
    Frame rate mode : Constant
    Frame rate : 29.970 (30000/1001) FPS
    Standard : NTSC
    Color space  : YUV
    Chroma subsampling : 4:2:0
    Bit depth  : 8 bits
    Scan type : Progressive
    Bits/(Pixel*Frame) : 0.241
    Stream size : 424 MiB (98%)
    Language  : English
    Encoded date   : UTC 2017-11-06 09:23:38
    Tagged date : UTC 2017-11-06 09:23:38
    Color range : Limited
    Color primaries : BT.709
    Transfer characteristics  : BT.709
    Matrix coefficients  : BT.709

    Audio
    ID  : 1
    Format   : AAC
    Format/Info  : Advanced Audio Codec
    Format profile  : LC
    Codec ID  : mp4a-40-2
    Duration: 3 min 57 s
    Bit rate mode    : Variable
    Bit rate  : 318 kb/s
    Maximum bit rate  : 326 kb/s
    Channel(s)    : 2 channels
    Channel positions  : Front: L R
    Sampling rate    : 44.1 kHz
    Frame rate : 43.066 FPS (1024 SPF)
    Compression mode   : Lossy
    Stream size   : 9.00 MiB (2%)
    Language  : English
    Encoded date  : UTC 2017-11-06 09:23:38
    Tagged date  : UTC 2017-11-06 09:23:38

  • I'm going also to post a little part of the exported video and of the original sound file.

  •  Ok guys, I found what the problem was.... it was....  my video player !!

    I found it out when I upload a part of the video on Youtube to give you the link and make your hear the problem. It has the good sound quality.
    And indeed, when I changed the video player, my problem was gone.

    That's a bit ridiculous haha, but at least my problem is solved, and I've lernad a good lesson.

    Thanks a lot for your involvement !

  • Triem23Triem23 Moderator

    Glad it was an easy fix. Guess I owe @jsbarrett $5!

  • By the way, if it can help others, the problematic video player was MPC Star.

  • @Triem23 Woohoo!  I'm rich! :D

    *ahem*

    Glad the problem was solved quickly.

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