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marshalls80180313
Known Participant
March 27, 2020
Question

Random bright frames / flicker in mp4 after export. PE 2018.

  • March 27, 2020
  • 1 reply
  • 1320 views

When watching an mp4 video created by PE 2018, every once in a while there is a slight flicker, i.e. one single frame randomly has a higher luminance than the others.  These "flashing" glitches are never present in the preview, only in the mp4 after export.  They are definitely not present in the original files and seem to appear in different places even without making any changes to the timeline.  I've experimented with different settings (turning maximum bit depth, hardware acceleration, etc... on/off) but different settings only lead to the glitch appearing in different locations.

 

Has anyone else experienced this?  Please help.  This is EXTREMELY annoying for a perfectionist like me.  I want a clean professional looking output.  These random flickers ruin it for me.

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1 reply

S
Steve Grisetti
Legend
March 27, 2020

What device recorded your original video?

 

Open a sample of your raw footage in the free download MediaInfo. In MediaInfo, set View to Text and then copy the text of its report and paste it to this forum. We need to determine if the issue is in your source footage specs.

 

Also, what software are you playing your finished MP4 on? Try VLC Media Player. It's free and it has none of the limitations of say Windows Media Player or Quicktime.

M
marshalls80180313Author
Known Participant
March 27, 2020

Update:  After some investigation it seems like the overall size of the project is leading to these problems.    The project is about 15 minutes long and references about 33 GB worth of source data.  If I render only a short section the problem doesn't appear.  I will try cutting the video in half where there is a fade-to-black around 9 minutes.

 

The problem then is I will have to re-encode when I put the parts back together.  Unless there is a way to join without re-incoding somehow with ffmpeg.  

M
marshalls80180313Author
Known Participant
March 28, 2020

I tried to explain.  I guess you didn't understand.  I created an "opening" clip using a combination of raw footage and transparent text.  Because the effect was not working the way I wanted it to in the project, I made it into its own clip and then inserted it into the larger project.  The "opening" clip was created using the combination of a PNG and some video footage.  I can try remaking it with different settings but I want to keep high quality.  Even the original footage used to create that had to first be converted from h265 to h264 using ffmpeg (libx264) to even work in premiere elements.  I don't even have the h265 footage anymore as I had to deleta it off my GoPro to clear space.  Do you want me to give you the h264 footage?

 

Could the problem be the PNG file?  I don't understand what the program could be doing to insert random bright frames.  It seems like a really stupid encoding bug as it doesn't happen at all in the preview.  Also cutting the length down to 10 minutes didn't help.  I have no idea at this point.


Here is the background footage (h264 version created with ffmpeg).

 

General
Complete name : C:\Users\Marshall Stoner\Pictures\2020-01-16\project\GX014838h264.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 206 MiB
Duration : 31 s 360 ms
Overall bit rate : 55.1 Mb/s
Writing application : Lavf58.17.101

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.2
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, RefFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 31 s 348 ms
Bit rate : 54.9 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 59.940 (60000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.441
Stream size : 205 MiB (100%)
Title : GoPro H.265
Writing library : x264 core 155 r2901 7d0ff22
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=16.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Language : English
Color range : Full

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : mp4a-40-2
Duration : 31 s 360 ms
Bit rate mode : Constant
Bit rate : 192 kb/s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 725 KiB (0%)
Title : GoPro AAC
Language : English
Default : Yes
Alternate group : 1

Other
ID : 3
Type : Time code
Format : QuickTime TC
Duration : 31 s 348 ms
Time code of first frame : 16:44:18:31
Time code, striped : Yes
Title : GoPro H.265
Language : English
Default : No

 

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