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TOPIC: Frame rate changes

Frame rate changes 2 weeks, 1 day ago #222549

  • classical61
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I am probably missing something simple because it didn't happen before. Adding new clips to old project. New clip recorded on phone which is set to record at 30fps, same as project. Once imported clip gives "check frame rate and audio sample rate" I can drag it to edit box but it's obviously no good. Audio is way off and it's at 20fps variable. Why is it going down to 20 fps and it plays fine on VLC

Re: Frame rate changes 2 weeks, 1 day ago #222559

  • hugly
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Hello,

That sounds strange.

Could you post a Mediainfo report of the video which shows 20 fps when imported in a 30 ps project, please? Here you'll find directions:

www.lwks.com/index.php?option=com_kunena&func=view&catid=23&id=66072&Itemid=81#66072
It's better to travel well than to arrive...

Re: Frame rate changes 2 weeks, 1 day ago #222561

  • classical61
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  • 2 weeks, 1 day ago
eneral
Complete name : C:\Users\User\Videos\MACK20.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (mp41/avc1)
File size : 32.8 MiB
Duration : 1 min 51 s
Overall bit rate mode : Variable
Overall bit rate : 2 478 kb/s
Encoded date : UTC 2020-07-24 23:07:00
Tagged date : UTC 2020-07-24 23:07:00
Writing application : vlc 3.0.6 stream output
Comment : QuickTime 6.0 or greater

Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1 min 51 s
Bit rate : 2 371 kb/s
Nominal bit rate : 3 500 kb/s
Width : 1 920 pixels
Height : 1 090 pixels
Original height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 19.978 FPS
Minimum frame rate : 11.515 FPS
Maximum frame rate : 30.010 FPS
Original frame rate : 30.000 FPS

Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.057
Stream size : 31.4 MiB (96%)
Writing library : x264 core 155
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x13 / 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=abr / mbtree=1 / bitrate=3500 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Language : English
Encoded date : UTC 2020-07-24 23:07:00
Tagged date : UTC 2020-07-24 23:07:00
Color range : Full
Color primaries : BT.601 NTSC
Transfer characteristics : BT.709
Matrix coefficients : BT.470 System B/G
Codec configuration box : avcC

Audio
ID : 1
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 1 min 50 s
Bit rate mode : Variable
Bit rate : 96.0 kb/s
Maximum bit rate : 144 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 1.27 MiB (4%)
Language : English
Encoded date : UTC 2020-07-24 23:07:00
Tagged date : UTC 2020-07-24 23:07:00

Re: Frame rate changes 2 weeks, 1 day ago #222565

  • hugly
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Thanky you

That shouldn't be importable at all, because it isn't supported.

Lightworks supports variable frame rates on h.264 streams, but it does not support non-standard target frame rates, 19.978 FPS in this case.

To fix the issues you have to convert to a standard frame rate, straight 30 fps. I'd suggest using Handbrake with the settings shown here:

www.lwks.com/index.php?option=com_kunena&func=view&catid=23&id=166802&Itemid=81#209009

As a matter of interest is that a screen recording or camera recording?
It's better to travel well than to arrive...

Re: Frame rate changes 2 weeks, 1 day ago #222568

  • classical61
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But can you see where original frame rate is 30? If it's recorded at 30 why would it decrease once imported? I actually want it to be 30 and not variable. My phone definitely recorded at 30fps. The data I sent is just pasted from Mediainfo

Re: Frame rate changes 2 weeks, 1 day ago #222571

  • hugly
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We can continue discussing about mediainfo, your phone, your setting, solving the problem of world hunger, and what not, but the best bet you have to solve your problem is converting, as mentioned.
It's better to travel well than to arrive...

Re: Frame rate changes 2 weeks, 1 day ago #222572

  • classical61
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Yeah I'll convert it for now. I'll just look for another source to find out WHY a 30fps video goes to 20fps on import. That way I won't have to convert at all. No sweat

Re: Frame rate changes 2 weeks, 1 day ago #222573

  • hugly
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As long as Lightworks doesn't support non-standard target frame rates, you will have trouble with sync and timing problems with this kind of video. Mediainfo is quite reliable in terms of detecting non-standard frame rates. If you don't trust it, crosscheck with ffprobe.

The obvious bug is that Lightworks allows importing that file.
It's better to travel well than to arrive...
Last Edit: 2 weeks, 1 day ago by hugly.

Re: Frame rate changes 2 weeks, 1 day ago #222574

  • classical61
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From older posts I knew that frame rate wasn't supported. I absolutely believe that. It was shot at 30. Convert to 20 upon import. Didn't want to convert everything I shoot. Strange that it did let me import though with bad audio
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