XnView Software

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D:\> ffmpeg -y -i "%d.png" -c:v av1 output.avif

Input #0, image2, from '%d.png':
  Duration: 00:00:00.32, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: png, rgb24(pc, gbr/unknown/unknown), 2552x3508 [SAR 11811:11811 DAR 638:877], 25 fps, 25 tbr, 25 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> av1 (libaom-av1))
Press [q] to stop, [?] for help
[libaom-av1 @ 000001c99732d300] 3.7.0-636-g7e1dfee837
[libaom-av1 @ 000001c99732d300] Neither bitrate nor constrained quality specified, using default CRF of 32
Output #0, avif, to 'output.avif':
  Metadata:
    encoder         : Lavf60.16.100
  Stream #0:0: Video: av1 (av01 / 0x31307661), gbrp(pc, gbr/unknown/unknown, progressive), 2552x3508 [SAR 1:1 DAR 638:877], q=2-31, 25 fps, 12800 tbn (default)
    Metadata:
      encoder         : Lavc60.31.102 libaom-av1
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=    0 fps=0.0 q=0.0 size=       0kB time=N/A bitrate=N/A speed=N/A    
frame=    0 fps=0.0 q=0.0 size=       0kB time=N/A bitrate=N/A speed=N/A    
[out#0/avif @ 000001c99732c280] video:3688kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.028071%
frame=    8 fps=0.0 q=0.0 Lsize=    3689kB time=00:00:00.28 bitrate=107918.2kbits/s speed=0.000286x    

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[ExifTool]      ExifTool Version Number         : 12.26
[QuickTime]     AV1 Configuration Version       : 1
[QuickTime]     Chroma Format                   : YUV 4:4:4
[QuickTime]     Chroma Sample Position          : Unknown
[QuickTime]     Color Representation            : nclx 2 2 0
[QuickTime]     Compatible Brands               : avis, avif, msf1, iso8, mif1, miaf, MA1A
[QuickTime]     Create Date                     : 0000:00:00 00:00:00
[QuickTime]     Current Time                    : 0 s
[QuickTime]     Duration                        : 0.32 s
[QuickTime]     Graphics Mode                   : srcCopy
[QuickTime]     Handler Description             : PictureHandler
[QuickTime]     Handler Type                    : Picture
[QuickTime]     Image Height                    : 3508
[QuickTime]     Image Pixel Depth               : 8 8 8
[QuickTime]     Image Spatial Extent            : 2552x3508
[QuickTime]     Image Width                     : 2552
[QuickTime]     Major Brand                     : Unknown (avis)
[QuickTime]     Matrix Structure                : 1 0 0 0 1 0 0 0 1
[QuickTime]     Media Create Date               : 0000:00:00 00:00:00
[QuickTime]     Media Data Offset               : 1076
[QuickTime]     Media Data Size                 : 3776061
[QuickTime]     Media Duration                  : 0.32 s
[QuickTime]     Media Header Version            : 0
[QuickTime]     Media Language Code             : und
[QuickTime]     Media Modify Date               : 0000:00:00 00:00:00
[QuickTime]     Media Time Scale                : 12800
[QuickTime]     Minor Version                   : 0.0.0
[QuickTime]     Modify Date                     : 0000:00:00 00:00:00
[QuickTime]     Movie Header Version            : 0
[QuickTime]     Next Track ID                   : 2
[QuickTime]     Op Color                        : 0 0 0
[QuickTime]     Other Format                    : av01
[QuickTime]     Poster Time                     : 0 s
[QuickTime]     Preferred Rate                  : 1
[QuickTime]     Preferred Volume                : 100.00%
[QuickTime]     Preview Duration                : 0 s
[QuickTime]     Preview Time                    : 0 s
[QuickTime]     Primary Item Reference          : 1
[QuickTime]     Selection Duration              : 0 s
[QuickTime]     Selection Time                  : 0 s
[QuickTime]     Time Scale                      : 1000
[QuickTime]     Track Create Date               : 0000:00:00 00:00:00
[QuickTime]     Track Duration                  : 106751991167 days 7:12:56
[QuickTime]     Track Header Version            : 1
[QuickTime]     Track ID                        : 1
[QuickTime]     Track Layer                     : 0
[QuickTime]     Track Modify Date               : 0000:00:00 00:00:00
[QuickTime]     Track Volume                    : 0.00%
[Composite]     Avg Bitrate                     : 94.4 Mbps
[Composite]     Image Size                      : 2552x3508
[Composite]     Megapixels                      : 9.0

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ffmpeg -f concat -i file_list.txt -c copy output.avif

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C:\> ffmpeg --version
ffmpeg version 7.0.2-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 13.2.0 (Rev5, Built by MSYS2 project)