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Livestream - dropped frames in recorded video

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Marina Cotrim
Livestream - dropped frames in recorded video
on Mar 30, 2017 at 8:38:29 pm

Hi everyone,

Where I work, we use Livestream Studio to capture videos from a broadcast camera.
We've been using the same set up in a few months, but recently we are having problems with dropped frames.
At some point in the video (wich normally has 20-30 minutes), the audio "crackles", the sync is lost, and we notice that there was a jump in the video.
Then the video continues ok, the audio is delayed by some frames.

I looked at the file info with Media Info and here's what I got:

General
Complete name : 03-03.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 1.46 GiB
Duration : 25mn 12s
Overall bit rate mode : Variable
Overall bit rate : 8 307 Kbps
Encoded date : UTC 2017-03-06 11:44:41
Tagged date : UTC 2017-03-18 18:39:15

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 1 frame
Format settings, GOP : M=1, N=60
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 25mn 12s
Bit rate mode : Variable
Bit rate : 7 983 Kbps
Maximum bit rate : 12.1 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 29.970 fps
Minimum frame rate : 9.990 fps
Maximum frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.128
Stream size : 1.41 GiB (96%)
Language : English
Encoded date : UTC 2017-03-06 11:44:41
Tagged date : UTC 2017-03-06 11:44:41

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 25mn 12s
Bit rate mode : Variable
Bit rate : 320 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 57.7 MiB (4%)
Language : English
Encoded date : UTC 2017-03-06 11:44:41
Tagged date : UTC 2017-03-06 11:44:41


I noticed the framerate is variable, but i'm sure that the reason for that is the dropped frames. When the problem doesn't happen, the framerate is constant.
Also, it's not an internet issue, because i'm not livestreaming (and even offline sometimes).

Does anyone has any ideas on how to fix it?
Thank you!


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