Black frames every 10 seconds or so in video .mp4 import

chadbresson wrote on 10/3/2020, 9:34 AM

When I import a video clip, whether I adjust the frame rate to the project rate or don't adjust to the project rate, I get black frames every 10 seconds or so in the video clip. These black frames do not exist in the original .mp4 file (I can play it in a movie player.. no black frames). How do I import the movie exactly as is?

Comments

johnebaker wrote on 10/3/2020, 11:16 AM

@chadbresson

This sounds like a result of the source videos in this issue you raised?

Are these the converted videos from that topic or the same source?

John EB

chadbresson wrote on 10/3/2020, 11:51 AM

@johnebaker

Different source. This time, I'm pulling in an .mp4 from Facebook (yes... don't ask... LOL), in order to edit. Source video is fine... but black frames show up when I import.

Looking at the media info... the file says the framerate is 30fps, but in the import MMEP insists and treats it as 29.97. Either the media info isn't correct or MMEP has a switch I've missed.

Is this another issue of "variable" needs to be 'fixed"? And how do I do that?

Thanks.

Here's the media info:

General
Complete name : E:\videos\10000000_177255790632932_9140209425740894906_n.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 206 MiB
Duration : 1 h 24 min
Overall bit rate : 343 kb/s
Writing application : Lavf56.40.101

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3
Format settings : CABAC / 3 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 3 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1 h 24 min
Bit rate : 271 kb/s
Width : 640 pixels
Height : 360 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 30.000 FPS
Minimum frame rate : 29.412 FPS
Maximum frame rate : 30.303 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.039
Stream size : 163 MiB (79%)
Writing library : x264 core 157
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=4 / threads=4 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=0 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=4 / b_pyramid=1 / b_adapt=2 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=60 / keyint_min=31 / scenecut=0 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=25.0 / qcomp=0.45 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=500 / vbv_bufsize=1000 / crf_max=0.0 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.30
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC SBR
Format/Info : Advanced Audio Codec Low Complexity with Spectral Band Replication
Commercial name : HE-AAC
Format settings : NBC
Codec ID : mp4a-40-5
Duration : 1 h 24 min
Duration_LastFrame : -1 ms
Bit rate mode : Constant
Bit rate : 64.0 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 23.438 FPS (2048 SPF)
Compression mode : Lossy
Stream size : 38.5 MiB (19%)
Default : Yes
Alternate group : 1

johnebaker wrote on 10/4/2020, 2:52 AM

@chadbresson

. . . . Is this another issue of "variable" needs to be 'fixed"? And how do I do that? . . .

The variable frame rate is the most likely cause of the black frames, converting with Handbrake to constant frame rate should fix this.

John EB