Strange export from Premiere Pro

Hi @jamieclarke 

I have just sent you by email my problematic MP4 file.

Hi @pierret18811376 - Would you be able to send me the file and project.  You can send a link to jamiec@adobe.com 

Is the pixelation always in the same place on export or different?  Where is this file from?

Hi @jamieclarke 

I have installed and tried the Pemiere Pro beta version, and in the exported file from Premiere Pro beta, the problem is always here (pixelation).

Hi @pierret18811376 -

I believe there’s a fix for your issue and it’s currently available in the Beta build. If you’d like to try it out, open the Creative Cloud desktop app, click Apps on the left, then select the Beta tab at the top. From there, find the Premiere Pro (Beta) box and click Install.

Hi @R Neil Haugen , Hi @jamieclarke 

1) properties of the original file :

Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 65.1 MiB
Duration : 5 min 32 s
Overall bit rate : 1 645 kb/s
Frame rate : 21.408 FPS
Writing application : Lavf58.76.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Constrained Baseline@L3.1
Format settings : 1 Ref Frames
Format settings, CABAC : No
Format settings, Reference frames : 1 frame
Format settings, Slice count : 10 slices per frame
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 5 min 32 s
Source duration : 5 min 32 s
Bit rate : 1 506 kb/s
Width : 1 190 pixels
Height : 666 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 21.408 FPS
Minimum frame rate : 9.232 FPS
Maximum frame rate : 30.341 FPS
Original frame rate : 24.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.089
Stream size : 59.6 MiB (92%)
Source stream size : 59.6 MiB (92%)
Writing library : x264 core 164 r3095M baee400
Encoding settings : cabac=0 / ref=1 / deblock=1:0:0 / analyse=0x1:0x1 / me=dia / subme=1 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=10 / lookahead_threads=10 / sliced_threads=1 / slices=10 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=250 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc=crf / mbtree=0 / crf=24.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
mdhd_Duration : 332275
Codec configuration box : avcC

2) Properties of the exported file from Premiere Pro (with Match source adaptative high bitrate) :

Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (mp42/mp41)
File size : 49.5 MiB
Duration : 5 min 15 s
Overall bit rate mode : Variable
Overall bit rate : 1 314 kb/s
Frame rate : 23.976 FPS
Encoded date : 2025-05-21 18:36:14 UTC
Tagged date : 2025-05-21 18:36:14 UTC
TIM : 00:00:00:00
TSC : 24000
TSZ : 1001

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.1
Format settings : CABAC / 2 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 2 frames
Format settings, GOP : M=1, N=23
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 5 min 15 s
Bit rate mode : Variable
Bit rate : 999 kb/s
Width : 1 190 pixels
Height : 666 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.053
Stream size : 37.4 MiB (76%)
Writing library : AVC Coding
Language : English
Encoded date : 2025-05-21 18:36:14 UTC
Tagged date : 2025-05-21 18:36:14 UTC
Codec configuration box : avcC

3) I am using Premiere Pro 25.2.3 on Windows 11  24H2 .

What is the framesize and framerate of the original clip?

What is the framesize and framerate of the sequence?

What are those for the export?