Hello,
AFAIK, this is a libsvtav1 issue, not an ffmpeg issue.
The kind of setup and target you have is possible with libx264, for
example, but not with libsvtav1.
You can give a try to the CBR mode of libsvtav1, but it is very
restricted, it involves the low delay mode, I feel you won't be very
happy with the resulting quality, but actually you should obtain the
desired bitrate.
Nicolas
On 8/29/25 10:03, Hervé ANSELME via ffmpeg-user wrote:
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Hello all,
I am using the release 8.0 of ffmpeg/ffprobe, running on Windows 11 Family OS.
I executed the following command :
ffmpeg -i "initial movie.mkv" -y -loglevel error -sn ^
-map 0:a:0 -acodec aac -ar 44100 -b:a 128k ^
-map 0:v:0 -vcodec libsvtav1 -vf "scale=768:432" -sws_flags
lanczos+accurate_rnd -b:v 1200k -minrate 1200k ^
-svtav1-params
"lossless=lower:nal-hrd=cbr:force-cfr=1:vbv-maxrate=1200k:vbv-bufsize=2400k" ^
-bufsize 2400k "final movie.mkv"
then, to see the result in the final film, regarding the video characteristics,
I executed :
ffprobe -v error -select_streams v -show_entries
stream=codec_name,width,height,avg_frame_rate -of default=noprint_wrappers=1 "final
movie.mkv"
which result is :
bit_rate=930911
codec_name=av1
width=768
height=432
avg_frame_rate=25/1
which raises the question : how is it that there is such a large difference,
between the desired video bitrate (1200k) and the actual video bitrate obtained
(930911 = 930k) ?
How should I modify my command line to obtain an effective video bitrate that
is, if not equal, at least as close as possible, to 1200k ?
Thank you in advance for your replies and advices.
Cdlt,
HA
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