#10735: Bug: FFmpeg's qsv encoder wrappers broken with the -g parameter set,
cannot
enforce set keyframe interval
-------------------------------------+-------------------------------------
Reporter: Dennis E. | Owner: (none)
Mungai |
Type: defect | Status: new
Priority: critical | Component: avcodec
Version: git-master | Resolution:
Keywords: quicksync | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by wenbin,chen):
I cannot run the command you provide, so I make some changes to make it
work
{{{
ffmpeg -thread_queue_size 5120 -nostdin -y -fflags +genpts -y \
-init_hw_device vaapi=va:/dev/dri/renderD129 \
-init_hw_device qsv=qs@va \
-filter_hw_device qs \
-extra_hw_frames 64 \
-threads:v 2 -async 1 \
-probesize 10M -analyzeduration 10M \
-hwaccel vaapi -hwaccel_output_format vaapi \
-f mpegts -fix_teletext_pts 1 -scan_all_pmts 1 -merge_pmt_versions 1 \
-i "input.ts" \
-vf
'hwmap=derive_device=qsv,format=qsv,vpp_qsv=deinterlace=2:scale_mode=0:async_depth=4'
\
-sc_threshold 0 -strict -1 -bitrate_limit:v 0 -g:v 50 -async_depth:v 4
-look_ahead_depth:v 40 \
-preset:v medium -refs:v 5 -extbrc:v 1 -bf:v 0 -low_power:v 1 -r:v 25 \
-b:v 4500k -minrate:v 4500k -maxrate:v 4500k -bufsize:v 9000k
-rc_init_occupancy:v 4500k -c:v h264_qsv \
-c:a aac -ac 2 -b:a 128k \
-flags -global_header+cgop -max_muxing_queue_size 2048
-max_interleave_delta 0 -flush_packets 0 -fps_mode cfr -f mpegts \
-y "out.ts"
}}}
I added "-hwaccel vaapi -hwaccel_output_format vaapi" options
gop_size(-g) is measured by number of frames not by pts time. You should
count frames between two I frames to verify it.
I see you enabled extbrc. It will automatically enable adaptive_i which
makes the result doesn't strictly obey the gop_size you set. It inserts I
frame when it is needed, for example when scene change.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10735#comment:4>
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