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fix(heif): Can not output AVIF when libheif has no HEVC support #5013

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Merged
lgritz merged 1 commit into from
Jan 23, 2026
Merged

fix(heif): Can not output AVIF when libheif has no HEVC support #5013

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7 changes: 5 additions & 2 deletions src/heif.imageio/heifoutput.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,9 @@ class HeifOutput final : public ImageOutput {
std::unique_ptr<heif::Context> m_ctx;
heif::ImageHandle m_ihandle;
heif::Image m_himage;
heif::Encoder m_encoder { heif_compression_HEVC };
// Undefined until we know the specific requested encoder, because an
// exception is thrown if libheif is built without support for it.
heif::Encoder m_encoder { heif_compression_undefined };
std::vector<unsigned char> scratch;
std::vector<unsigned char> m_tilebuffer;
int m_bitdepth = 0;
Expand Down Expand Up @@ -140,12 +142,13 @@ HeifOutput::open(const std::string& name, const ImageSpec& newspec,
m_himage.add_plane(heif_channel_interleaved, newspec.width,
newspec.height, m_bitdepth);

m_encoder = heif::Encoder(heif_compression_HEVC);
auto compqual = m_spec.decode_compression_metadata("", 75);
auto extension = Filesystem::extension(m_filename);
if (compqual.first == "avif"
|| (extension == ".avif" && compqual.first == "")) {
m_encoder = heif::Encoder(heif_compression_AV1);
} else {
m_encoder = heif::Encoder(heif_compression_HEVC);
}
} catch (const heif::Error& err) {
std::string e = err.get_message();
Expand Down
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