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fix(stable-diffusion.ggml): force mp4 container in ffmpeg mux (#9435)

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gen_video's ffmpeg subprocess was relying on the filename extension to
choose the output container. Distributed LocalAI hands the backend a
staging path (e.g. /staging/localai-output-NNN.tmp) that is renamed to
.mp4 only after the backend returns, so ffmpeg saw a .tmp extension and
bailed with "Unable to choose an output format". Inference had already
completed and the frames were piped in, producing the cryptic
"video inference failed (code 1)" at the API layer.

Pass -f mp4 explicitly so the container is selected by flag instead of
by filename suffix.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Ettore Di Giacinto 2026-04-20 00:41:54 +02:00 committed by GitHub
parent 9e44944cc1
commit 60633c4dd5
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5
backend/go/stablediffusion-ggml/gosd.cpp
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@ -1106,6 +1106,11 @@ static int ffmpeg_mux_raw_to_mp4(sd_image_t* frames, int num_frames, int fps, co
const_cast<char*>("-c:v"), const_cast<char*>("libx264"),
const_cast<char*>("-pix_fmt"), const_cast<char*>("yuv420p"),
const_cast<char*>("-movflags"), const_cast<char*>("+faststart"),
// Force MP4 container. Distributed LocalAI hands us a staging
// path (e.g. /staging/localai-output-NNN.tmp) with a non-standard
// extension; relying on filename suffix makes ffmpeg bail with
// "Unable to choose an output format".
const_cast<char*>("-f"), const_cast<char*>("mp4"),
const_cast<char*>(dst),
nullptr
};