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I'm implementing a video transcoding pipeline using FFmpeg with the libsvtav1 encoder to convert H.264 videos to AV1. However, I'm seeing unexpected results: the output files are larger than the originals, even when using CRF values (24 and 30) that should theoretically reduce file size.

Current Implementation:

# Attempt 1
ffmpeg -i input.mp4 -c:v libsvtav1 -crf 24 -y output_crf24.mp4

# Attempt 2
ffmpeg -i input.mp4 -c:v libsvtav1 -crf 30 -y output_crf30.mp4

Example Input vs Output: Original H.264 (input.mp4):

Resolution: 1280x960

Bitrate: ~1463 kb/s

Codec info (via ffprobe):

Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x960, 1460 kb/s, 30 fps
AV1 Encoded Output (CRF 24):

Bitrate: ~1503 kb/s

Codec info:

Stream #0:0: Video: av1 (Main), yuv420p, 1280x960, 1501 kb/s, 30 fps
encoder: Lavc62.0.101 libsvtav1

What I've Tried: Varying CRF values: 24 and 30

Using FFmpeg’s default preset settings (no additional tuning or options)

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  • ~1463 kb/s is really low for H264, you can hardly compress anything further.
    – zalnaRs
    Commented May 19 at 18:59

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