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Introduce qmax parameter for ffmpeg preview encoding

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Added PREVIEW_QMAX_PARAM to control ffmpeg encoding quality.
This commit is contained in:
nulledy 2026-02-12 16:04:20 -05:00
parent 53785bd788
commit d12546f296
1 changed files with 10 additions and 1 deletions
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11
frigate/output/preview.py
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@ -47,6 +47,15 @@ PREVIEW_QUALITY_BIT_RATES = {
RecordQualityEnum.high: 9864,
RecordQualityEnum.very_high: 10096,
}
# the -qmax param for ffmpeg prevents the encoder from overly compressing frames while still trying to hit the bitrate target
# lower values are higher quality. This is especially important for iniitial frames in the segment
PREVIEW_QMAX_PARAM = {
RecordQualityEnum.very_low: '',
RecordQualityEnum.low: '',
RecordQualityEnum.medium: '',
RecordQualityEnum.high: '-qmax 25',
RecordQualityEnum.very_high: '-qmax 25',
}
def get_cache_image_name(camera: str, frame_time: float) -> str:
@ -125,7 +134,7 @@ class FFMpegConverter(threading.Thread):
config.ffmpeg.ffmpeg_path,
"default",
input="-f concat -y -protocol_whitelist pipe,file -safe 0 -threads 1 -i /dev/stdin",
output=f"-threads 1 -g {PREVIEW_KEYFRAME_INTERVAL} -bf 0 -b:v {PREVIEW_QUALITY_BIT_RATES[self.config.record.preview.quality]} {FPS_VFR_PARAM} -movflags +faststart -pix_fmt yuv420p {self.path}",
output=f"-threads 1 -g {PREVIEW_KEYFRAME_INTERVAL} -bf 0 -b:v {PREVIEW_QUALITY_BIT_RATES[self.config.record.preview.quality]} {PREVIEW_QMAX_PARAM[self.config.record.preview.quality]} {FPS_VFR_PARAM} -movflags +faststart -pix_fmt yuv420p {self.path}",
type=EncodeTypeEnum.preview,
)