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  "markdown": "DSV (Digital Subband Video 1, or DSV1) is a hobby codec by EMMIR (Envel Graphics): a small, wavelet-based, software-only codec that the author compares to MPEG-1/MPEG-2 in efficiency. It exists to be read and tinkered with, not to play back in anything. The repository was archived on 4 October 2024 and its README points to [DSV2](/codecs/video/dsv2/), which the author says compresses far better. Use DSV2 for any new experiment.\n\n## What it does\n\n- Multiresolution subband (wavelet) transform instead of a DCT.\n- Intra and forward-predicted inter frames, half-pixel motion compensation, no B-frames, variable-length closed GOPs.\n- 8-bit 4:1:1, 4:2:0, 4:2:2 and 4:4:4; no interlacing; frame dimensions must be even.\n- Interleaved exp-Golomb entropy coding, adaptive quantisation, and hierarchical motion estimation.\n- Single-pass ABR or CRF rate control.\n- The reference implementation is C89 with integer-only maths, no dependencies and a single thread.\n\n## Using the reference tool\n\nThe author's reference code (also available as the single header `dsv1.h`) is the only implementation; there is no FFmpeg or player support. Build it with `cc -O3 -o dsv1 *.c` from a checkout and run:\n\n```sh\n./dsv1 e -inp_video.yuv -out_compressed.dsv -w352 -h288 -fps_num24 -fps_den1 -qp85 -gop15\n./dsv1 d -inp_compressed.dsv -out_decompressed.yuv -out420p\n```\n\nOptions are written as `-name` immediately followed by the value (`-w352`, `-qp85`), unlike DSV2's `-name=value`. Input is raw YUV, so give the dimensions and frame rate; it is read as 4:2:0 unless you set `-fmt`. `-kbps` switches to ABR. `-out420p` converts the decoded output to 4:2:0, which discards chroma from a 4:2:2 or 4:4:4 stream. The format is described in `DSV1_spec_r2.pdf` in the repository.\n"
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