[solved]
#fediHelp #video #ffmpeg #resizing

Hi there!
While testing resizing videos filmed with a Samsung NX3000 camera with ffmpeg into different smaller sizes I just tested to use the same video size as the actual original video to see what would happen and got an incredible reduction of the video size.

The original 20 minute video was 1.4 gig . This size for 20 minute videos is always the same. The new video with apparently the exact same codec data as shown by VLC, see pictures, is only 244 MB (0.244gig).
I haven't found any information about something like this in a fast search on the web.

Video data of the original video:
1280x720 | H264 - MPEG-4 AVC (part10)(AVC1) 29.970030 fps planar 4:2:0 YUV Code: MPEG AAC Audio (mp4a) stereo 44100 khhz 32bits| 1.4gig

ffmpeg command used:
ffmpeg -i videoname.mp4 -s 1280x720 -movflags +faststart -c:a copy videoname_1280x720.mp4

Resizing to other sizes resulted in the following:
852x480 | -> 105 Gig
960x540 | -> 126 Gig
1280x720 | -> 244 Gig

Any idea why this could be?
How could I find out if there was a quality reduction?
On this laptop screen I can't see any difference.

Original video:

Video passed with the ffmpeg command choosing the same output size as the original video :

Size of the videos as shown by the file manager:

Some information from the metadata sheet of a videoGraphics Mode : srcCopy
Op Color : 0 0 0
Compressor ID : avc1
Source Image Width : 1280
Source Image Height : 720
X Resolution : 72
Y Resolution : 72
Compressor Name : AVC Coding
Bit Depth : 24
Video Frame Rate : 29.97
Matrix Structure : 1 0 0 0 1 0 0 0 1
--
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
the complete metadata as read by exiftoolExifTool Version Number : 12.92
File Name : 06160427_floracionAloe_picaFlor.MP4
Directory : .
File Size : 59 MB
File Modification Date/Time : 2024:06:16 10:49:08-03:00
File Access Date/Time : 2024:08:05 16:46:57-03:00
File Inode Change Date/Time : 2024:08:05 16:46:57-03:00
File Permissions : -rw-r--r--
File Type : MP4
File Type Extension : mp4
MIME Type : video/mp4
Major Brand : MP4 v2 [ISO 14496-14]
Minor Version : 0.0.0
Compatible Brands : mp42, avc1
Media Data Size : 58622992
Media Data Offset : 32
Movie Header Version : 0
Create Date : 2024:06:16 13:48:22
Modify Date : 2024:06:16 13:48:22
Time Scale : 30000
Duration : 0:00:45
Preferred Rate : 1
Preferred Volume : 100.00%
Preview Time : 0 s
Preview Duration : 0 s
Poster Time : 0 s
Selection Time : 0 s
Selection Duration : 0 s
Current Time : 0 s
Next Track ID : 3
Track Header Version : 0
Track Create Date : 2024:06:16 13:48:22
Track Modify Date : 2024:06:16 13:48:22
Track ID : 1
Track Duration : 0:00:45
Track Layer : 0
Track Volume : 0.00%
Image Width : 1280
Image Height : 720
Graphics Mode : srcCopy
Op Color : 0 0 0
Compressor ID : avc1
Source Image Width : 1280
Source Image Height : 720
X Resolution : 72
Y Resolution : 72
Compressor Name : AVC Coding
Bit Depth : 24
Video Frame Rate : 29.97
Matrix Structure : 1 0 0 0 1 0 0 0 1
Media Header Version : 0
Media Create Date : 2024:06:16 13:48:22
Media Modify Date : 2024:06:16 13:48:22
Media Time Scale : 44100
Media Duration : 0:00:45
Media Language Code : und
Handler Type : Audio Track
Handler Description : SF M7MU SPEAR NX3000 Audio Handler
Balance : 0
Audio Format : mp4a
Audio Channels : 2
Audio Bits Per Sample : 16
Audio Sample Rate : 44100
Play Mode : SEQ_PLAY
Make : Samsung
Camera Model Name : NX3000
Thumbnail Width : 2684354560
Thumbnail Height : 2013265920
Thumbnail Length : 2753626112
Exif Byte Order : Little-endian (Intel, II)
Orientation : Horizontal (normal)
Resolution Unit : inches
Y Cb Cr Positioning : Co-sited
Exif Version : 0230
Date/Time Original : 2024:06:16 13:49:08
Components Configuration : Y, Cb, Cr, -
Flashpix Version : 0100
Color Space : sRGB
Exif Image Width : 160
Exif Image Height : 120
Interoperability Index : THM - DCF thumbnail file
Interoperability Version : 0100
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Thumbnail Image : (Binary data 28800 bytes, use -b option to extract)
Image Size : 1280x720
Megapixels : 0.922
Avg Bitrate : 10.5 Mbps
Rotation : 0

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