Problem with video resolution (it keeps changing)

[m0ck]

Hi.
I have a bizarre problem with the video that I downloaded.
The video was supposed to be in 1080p (1920x1080) but it's not.
The first few seconds are in 640x360 and then the resolution changes to 1920x1080.
How is that even possible?
Is there a way to fix it without re-encoding?

MediaInfo shows two values:

Width : 640 pixels
Original width : 1 920 pixels
Height : 360 pixels
Original height : 1 080 pixels

I have attached a sample.

Full video:

https://1fichier.com/?jm7tlzmxkm1bnd98i4yj

[Selur]

Container headers indicate 640x360 while the stream headers signal 1920x1080 remuxing
try:

ffmpeg -i "Path to video.mp4" -c copy "path to output.mp4"

should fix this.

The first few seconds are in 640x360 and then the resolution changes to 1920x1080.

Doesn't happen here, seems like the player you use needs a bit to decide to stick with the resolution indicated by stream instead of the container.

Cu Selur

[m0ck]

Nope, remuxing didn't help. Already tried that. I think I need to get rid of those 360p headers. Mediainfo still shows two vlues after remuxing.

[Selur]

Remuxing did get rid of the extra header here,....

[m0ck]

How come it doesn't work for me? Can you send me a remuxed sample MP4 to check?

[Alwyn]

There's definitely something odd at 9.5sec. My NLE wouldn't display any video after 9.5sec, and when I re-encoded it, it paused at 9.5sec for a bit then continued on, but produced black after that 9.5sec point. VDub also stopped then, saying "Frame Format Incompatible". VideoRedo couldn't do anything with it.

[Selur]

Yeah, there's something wrong with the stream headers too. (Mediainfo only reports the first headers it finds)

extracting the raw stream using:

MP4Box -raw 1 "C:\Users\Selur\Desktop\video.mp4" -out "E:\Output\remux_2022-06-16@12_51_50_9010_02.264"

MediaInfo reports:

General
Count                                    : 331
Count of stream of this kind             : 1
Kind of stream                           : General
Kind of stream                           : General
Stream identifier                        : 0
Count of video streams                   : 1
Video_Format_List                        : AVC
Video_Format_WithHint_List               : AVC
Codecs Video                             : AVC
Complete name                            : e:\Output\remux_2022-06-16@12_51_50_9010_02.264
Folder name                              : e:\Output
File name extension                      : remux_2022-06-16@12_51_50_9010_02.264
File name                                : remux_2022-06-16@12_51_50_9010_02
File extension                           : 264
Format                                   : AVC
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format/Url                               : http://developers.videolan.org/x264.html
Format/Extensions usually used           : avc h264 264
Commercial name                          : AVC
Internet media type                      : video/H264
File size                                : 30095490
File size                                : 28.7 MiB
File size                                : 29 MiB
File size                                : 29 MiB
File size                                : 28.7 MiB
File size                                : 28.70 MiB
File creation date                       : UTC 2022-06-16 10:51:53.726
File creation date (local)               : 2022-06-16 12:51:53.726
File last modification date              : UTC 2022-06-16 10:51:53.803
File last modification date (local)      : 2022-06-16 12:51:53.803
Writing library                          : x264 - core 152 r2854 e9a5903
Writing library                          : x264 core 152 r2854 e9a5903
Encoded_Library_Name                     : x264
Encoded_Library_Version                  : core 152 r2854 e9a5903
Encoding settings                        : cabac=1 / ref=4 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=11 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=2 / keyint=120 / keyint_min=12 / scenecut=0 / intra_refresh=0 / rc_lookahead=40 / rc=cbr / mbtree=1 / bitrate=419 / ratetol=1.0 / qcomp=0.60 / qpmin=3 / qpmax=51 / qpstep=8 / vbv_maxrate=419 / vbv_bufsize=1679 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00

Video
Count                                    : 381
Count of stream of this kind             : 1
Kind of stream                           : Video
Kind of stream                           : Video
Stream identifier                        : 0
Format                                   : AVC
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format/Url                               : http://developers.videolan.org/x264.html
Commercial name                          : AVC
Format profile                           : High@L4
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4
Format settings, Reference frames        : 4 frames
Format settings, GOP                     : M=1, N=120
Internet media type                      : video/H264
Bit rate                                 : 419000
Bit rate                                 : 419 kb/s
Width                                    : 1920
Width                                    : 1 920 pixels
Height                                   : 1080
Height                                   : 1 080 pixels

but remuxing the stream using MP4Box it reports the 640x360 resolution:

[AVC|H264] Possible Variable Frame Rate: VUI "fixed_frame_rate_flag" absent
Track Importing MPEG-4 AVC - Width 640 Height 360 FPS 25/1 SAR 1/1
AVC|H264 Import results: 2040 samples (4115 NALUs) - Slices: 17 I 2023 P 0 B - 1 SEI - 17 IDR - 0 CRA
The given code is not a valid one: , using 'und' as 3-letter code

[Selur]

MP4box -info c:\Users\Selur\Desktop\video.mp4

reports

[isom/avcc] Missing REXT profile signaling, patching.
# Movie Info - 2 tracks - TimeScale 1000
Duration 00:01:21.607
Fragmented: no
Progressive (moov before mdat)
Major Brand isom - version 512 - compatible brands: isom iso2 avc1 mp41
Created: UNKNOWN DATE

iTunes Info:
        tool: Lavf58.29.100

# Track 1 Info - ID 1 - TimeScale 25000
Media Duration 00:01:21.600
Track has 1 edits: track duration is 00:01:21.600
Track flags: Enabled In Movie
Media Info: Language "Undetermined (und)" - Type "vide:avc1" - 2040 samples
Visual Sample Entry Info: width=640 height=360 (depth=24 bits)
Visual Track layout: x=0 y=0 width=640 height=360
AVC/H264 Video - Visual Size 640 x 360
        AVC Info: 1 SPS - 1 PPS - Profile High @ Level 3
        NAL Unit length bits: 32
        Pixel Aspect Ratio 1:1 - Indicated track size 640 x 360
        Chroma format YUV 4:2:0 - Luma bit depth 8 - chroma bit depth 8
        SPS#1 hash: 7B6CBBB863D2FBD4100E1C5746087B4B67BDC986
        PPS#1 hash: 7C8F8169BC70DC403DDC9FA6573C73BD57BAD9B5
        RFC6381 Codec Parameters: avc1.64001E
        Average GOP length: 127 samples
        Max sample duration: 1000 / 25000

# Track 2 Info - ID 2 - TimeScale 44100
Media Duration 00:01:21.606
Track has 1 edits: track duration is 00:01:21.607
Track flags: Enabled In Movie
Media Info: Language "Undetermined (und)" - Type "soun:mp4a" - 3515 samples
Alternate Group ID 1
MPEG-4 Audio AAC LC (AOT=2 implicit) - 2 Channel(s) - SampleRate 44100
        RFC6381 Codec Parameters: mp4a.40.2
        All samples are sync
        Max sample duration: 1024 / 44100

Looking with DGDecNV it first reports coded size 640x368 display size: 640x360 but later in the stream it reports 1920x1080 seems like this is dump of a mp4 dash or similar where the resolution changed,..

yup, using:

ffplay -v debug "path to file"

onse sees at the beginning:

[h264 @ 000002111ea695c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
[ffplay_buffer @ 000002111f4200c0] Setting 'video_size' to value '640x360'
[ffplay_buffer @ 000002111f4200c0] Setting 'pix_fmt' to value '0'
[ffplay_buffer @ 000002111f4200c0] Setting 'time_base' to value '1/25000'
[ffplay_buffer @ 000002111f4200c0] Setting 'pixel_aspect' to value '1/1'
[ffplay_buffer @ 000002111f4200c0] Setting 'frame_rate' to value '25/1'
[ffplay_buffer @ 000002111f4200c0] w:640 h:360 pixfmt:yuv420p tb:1/25000 fr:25/1 sar:1/1

and around the 9th second one sees:

[h264 @ 000002111ea68600] nal_unit_type: 9(AUD), nal_ref_idc: 0/0
[h264 @ 000002111ea68600] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
[h264 @ 000002111ea695c0] nal_unit_type: 9(AUD), nal_ref_idc: 0/0
[h264 @ 000002111ea695c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2
[h264 @ 000002111ea6fe40] nal_unit_type: 9(AUD), nal_ref_idc: 0/0
[h264 @ 000002111ea6fe40] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 000002111ea6fe40] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 000002111ea6fe40] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 000002111ea6fe40] Format yuv420p chosen by get_format().
[h264 @ 000002111ea6fe40] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 000002111e98cd00] nal_unit_type: 9(AUD), nal_ref_idc: 0/0
[h264 @ 000002111e98cd00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 2

only way to handle this is probably to do some binary cutting at the right position to get rid of the 640x360 part,...

[m0ck]

So basically the video is corrupted and cannot be fixed?
Here is full video if it helps.

https://1fichier.com/?jm7tlzmxkm1bnd98i4yj

[Selur]

The owner of this file has chosen to protect access with a password.
Please enter it below

[m0ck]

Try again.

[Selur]

works now

[Selur]

try a 2step method:

ffmpeg -ss 10 -i "PATH TO video.mp4" -c copy -bsf:v h264_mp4toannexb "path to intermediate.mp4"
ffmpeg -i "path to intermediate.mp4" -c copy -bsf:v h264_mp4toannexb "path to output.mp4"

Output now properly shows:

Width                                    : 1920
Width                                    : 1 920 pixels
Height                                   : 1080
Height                                   : 1 080 pixels
Stored_Height                            : 1088
Sampled_Width                            : 1920
Sampled_Height                           : 1080
Pixel aspect ratio                       : 1.000
Display aspect ratio                     : 1.778
Display aspect ratio                     : 16:9

for me.

Cu Selur

[m0ck]

Well, it works. But the video is missing 10 sec from the beginning and that's something I can't accept, unfortunately.
Anyways, thx so much for trying to help and figure out the solution. I appreciate it.

[Alwyn]

Combine the first bit and the last bit. First bit attached.

[jagabo]

I have a bizarre problem with the video that I downloaded.
The video was supposed to be in 1080p (1920x1080) but it's not.
The first few seconds are in 640x360 and then the resolution changes to 1920x1080.
How is that even possible?

This is common with streaming downloads. The video starts streaming at a low resolution/bitrate then speeds up and switches to HD when it sees there's sufficient bandwidth available. The best way to fix this to go back to the original streaming source and force it to start with HD when you capture. If you can't do that just trim away the first part of the video. It's just a studio logo.