Powerpoint export audio sync issues

aljagoaljago Website User Posts: 2 Just Starting Out

Hi All

Using Hitfilm Express to produce webinars.

These are broadcasted via teams with the meeting being recorded which I then edit.

For this weeks I prepped the presentation in Powerpoint and recorded the commentary for each slide. I've then exported it as a video which comes out from powerpoint as an MP4. Watching the powerpoint export directly the audio sync is as it should be, however as soon as I import this mp4 into Hitfilm express the sync goes wrong with a noticable mismatch...

Is there an easy fix for this for this?

Thanks

Alex

Comments

  • tddavistddavis Moderator, Website User Posts: 4,051 Moderator

    @aljago Most likely, as with screen capture software like OBS etc, your video is actually variable frame footage. Audio sync is a common issue with VFR and requires transcoding to constant to play nice with Hitfilm. The way to tell for certain is download a free utility called MediaInfo and run it and generate a text report and post it here for the knowledgeable gurus to decipher.

    To explain transcoding this very detailed video by Triem23 has everything:

    and this one by NormanPCN, I believe, adds to that:

    If you open the Hitfilm University link in Youtube there are timecodes under Show More to jump you to the parts you want around 19:33 minutes. Hope this helps you along and you find it useful.

  • aljagoaljago Website User Posts: 2 Just Starting Out

    That makes sense - so theoretically if I run it via handbrake and convert it to something with constant frame rate it should work?

    General

    Complete name              : C:\Users\alex_\OneDrive\Desktop\custody covid.mp4

    Format                  : MPEG-4

    Format profile              : Base Media / Version 2

    Codec ID                 : mp42 (mp41/isom)

    File size                : 692 MiB

    Duration                 : 33 min 56 s

    Overall bit rate             : 2 852 kb/s

    Encoded date               : UTC 2020-09-24 19:22:57

    Tagged date               : UTC 2020-09-24 19:22:57


    Video

    ID                    : 1

    Format                  : AVC

    Format/Info               : Advanced Video Codec

    Format profile              : [email protected]

    Format settings             : 2 Ref Frames

    Format settings, CABAC          : No

    Format settings, Reference frames    : 2 frames

    Format settings, GOP           : M=1, N=30

    Codec ID                 : avc1

    Codec ID/Info              : Advanced Video Coding

    Duration                 : 33 min 56 s

    Bit rate                 : 2 673 kb/s

    Width                  : 1 920 pixels

    Height                  : 1 080 pixels

    Display aspect ratio           : 16:9

    Frame rate mode             : Variable

    Frame rate                : 30.303 FPS

    Minimum frame rate            : 30.003 FPS

    Maximum frame rate            : 30.333 FPS

    Color space               : YUV

    Chroma subsampling            : 4:2:0

    Bit depth                : 8 bits

    Scan type                : Progressive

    Bits/(Pixel*Frame)            : 0.043

    Stream size               : 649 MiB (94%)

    Encoded date               : UTC 2020-09-24 19:22:57

    Tagged date               : UTC 2020-09-24 19:22:57

    mdhd_Duration              : 2036133

    Codec configuration box         : avcC


    Audio

    ID                    : 2

    Format                  : AAC LC

    Format/Info               : Advanced Audio Codec Low Complexity

    Codec ID                 : mp4a-40-2

    Duration                 : 33 min 56 s

    Bit rate mode              : Constant

    Bit rate                 : 175 kb/s

    Nominal bit rate             : 192 kb/s

    Channel(s)                : 2 channels

    Channel layout              : L R

    Sampling rate              : 44.1 kHz

    Frame rate                : 43.066 FPS (1024 SPF)

    Compression mode             : Lossy

    Stream size               : 42.6 MiB (6%)

    Encoded date               : UTC 2020-09-24 19:22:57

    Tagged date               : UTC 2020-09-24 19:22:57

    mdhd_Duration              : 2036148

  • tddavistddavis Moderator, Website User Posts: 4,051 Moderator
    edited September 27

    @aljago Yes, it should. I see that your frame rate is definitely variable, so I almost sure it will stop the mismatch.

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