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Avoid upscaling

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https://trac.ffmpeg.org/wiki/Scaling#AvoidingUpscaling
This commit is contained in:
Manav Rathi
2025-05-23 17:19:54 +05:30
parent 60246be861
commit ced1f6e164
1 changed files with 3 additions and 3 deletions
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6
desktop/src/main/services/ffmpeg-worker.ts
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@@ -228,7 +228,7 @@ export interface FFmpegGenerateHLSPlaylistAndSegmentsResult {
*
* Example invocation:
*
* ffmpeg -i in.mov -vf 'scale=-2:720,fps=30,zscale=transfer=linear,tonemap=tonemap=hable:desat=0,zscale=primaries=709:transfer=709:matrix=709,format=yuv420p' -c:v libx264 -c:a aac -f hls -hls_key_info_file out.m3u8.info -hls_list_size 0 -hls_flags single_file out.m3u8
* ffmpeg -i in.mov -vf "scale=-2:'min(720,ih)',fps=30,zscale=transfer=linear,tonemap=tonemap=hable:desat=0,zscale=primaries=709:transfer=709:matrix=709,format=yuv420p" -c:v libx264 -c:a aac -f hls -hls_key_info_file out.m3u8.info -hls_list_size 0 -hls_flags single_file out.m3u8
*
* See: [Note: Preview variant of videos]
*
@@ -412,7 +412,7 @@ const ffmpegGenerateHLSPlaylistAndSegments = async (
// Overview:
//
// - Video H.264 HD 720p 30fps.
// - Video H.264 HD 720p (max) 30fps.
// - Audio AAC 128kbps.
// - Encrypted HLS playlist with a single file containing all the chunks.
//
@@ -450,7 +450,7 @@ const ffmpegGenerateHLSPlaylistAndSegments = async (
// keeping aspect ratio and the calculated
// dimension divisible by 2 (some of the other
// operations require an even pixel count).
"scale=-2:720",
"scale=-2:'min(720,ih)'",
// Convert the video to a constant 30 fps,
// duplicating or dropping frames as necessary.
"fps=30",