| $ ./ffmpeg -i out.mp4 -f image2 -frames 1 output.png
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| ffmpeg version N-119416-ga439e93687 Copyright (c) 2000-2025 the FFmpeg developers
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| built with gcc 14 (Gentoo 14.2.1_p20241221 p7)
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| configuration: --enable-openssl --enable-ffnvcodec --enable-cuda-llvm --enable-libx265 --enable-gpl --enable-version3
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| libavutil 60. 2.100 / 60. 2.100
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| libavcodec 62. 1.102 / 62. 1.102
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| libavformat 62. 0.102 / 62. 0.102
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| libavdevice 62. 0.100 / 62. 0.100
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| libavfilter 11. 0.100 / 11. 0.100
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| libswscale 9. 0.100 / 9. 0.100
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| libswresample 6. 0.100 / 6. 0.100
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| libpostproc 59. 1.100 / 59. 1.100
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| Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
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| Metadata:
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| major_brand : isom
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| minor_version : 512
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| compatible_brands: isomiso2mp41
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| encoder : Lavf62.0.102
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| Duration: 00:00:13.14, start: 0.000000, bitrate: 1389 kb/s
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| Stream #0:0[0x1](eng): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1066 kb/s, 24 fps, 24 tbr, 12288 tbn (default) (multilayer)
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| Metadata:
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| handler_name : ?Mainconcept Video Media Handler
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| vendor_id : [0][0][0][0]
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| encoder : Lavc62.1.102 hevc_nvenc
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| Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
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| Metadata:
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| handler_name : #Mainconcept MP4 Sound Media Handler
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| vendor_id : [0][0][0][0]
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| File 'output.png' already exists. Overwrite? [y/N] y
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| Stream mapping:
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| Stream #0:0 -> #0:0 (hevc (native) -> png (native))
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| Press [q] to stop, [?] for help
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| [hevc @ 0x61325dc47f80] alignment_bit_equal_to_one=0
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| [hevc @ 0x61325dc47f80] Skipping invalid undecodable NALU: 1
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| [hevc @ 0x61325dd07440] Could not find ref with POC 10
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| [hevc @ 0x61325dd07440] Error constructing the frame RPS.
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| [hevc @ 0x61325dd07440] Skipping invalid undecodable NALU: 0
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| [hevc @ 0x61325de85dc0] Could not find ref with POC 10
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| [hevc @ 0x61325de85dc0] Error constructing the frame RPS.
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| [hevc @ 0x61325de85dc0] Skipping invalid undecodable NALU: 1
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| [hevc @ 0x61325df45280] Could not find ref with POC 16
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| [hevc @ 0x61325df45280] Error constructing the frame RPS.
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| [hevc @ 0x61325df45280] Skipping invalid undecodable NALU: 1
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| [hevc @ 0x61325d3d2a40] Could not find ref with POC 16
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| [hevc @ 0x61325d3d2a40] Error constructing the frame RPS.
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| [hevc @ 0x61325d3d2a40] Skipping invalid undecodable NALU: 1
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| Output #0, image2, to 'output.png':
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| Metadata:
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| major_brand : isom
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| minor_version : 512
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| compatible_brands: isomiso2mp41
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| encoder : Lavf62.0.102
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| Stream #0:0(eng): Video: png, rgba(pc, gbr/bt709/bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 24 fps, 24 tbn (default) (multilayer)
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| Metadata:
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| encoder : Lavc62.1.102 png
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| handler_name : ?Mainconcept Video Media Handler
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| vendor_id : [0][0][0][0]
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| [hevc @ 0x61325d88b800] Could not find ref with POC 20
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| [hevc @ 0x61325d88b800] Error constructing the frame RPS.
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| [hevc @ 0x61325d88b800] Skipping invalid undecodable NALU: 1
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| [image2 @ 0x61325d3da180] The specified filename 'output.png' does not contain an image sequence pattern or a pattern is invalid.
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| [image2 @ 0x61325d3da180] Use a pattern such as %03d for an image sequence or use the -update option (with -frames:v 1 if needed) to write a single image.
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| [out#0/image2 @ 0x61325d3da580] video:386KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
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| frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.201x
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