Fixing keyframes

[kostek00]

I have mkv file that have keyframes every second. Is there a way to recreate keyframes without reencoding file?

File details:
General
Unique ID: 189963141706975595335761979274290486594 (0x8EE991FECF39AC148996248C9B075D42)
Format: Matroska
Format version: Version 4 / Version 2
File size: 2.18 GiB
Duration: 58mn 4s
Overall bit rate: 5 363 Kbps
Encoded date: UTC 2017-12-27 17:39:32
Writing application: mkvmerge v19.0.0 ('Brave Captain') 32-bit
Writing library: libebml v1.3.5 + libmatroska v1.4.8
DURATION: 00:54:00.778000000
NUMBER_OF_FRAMES: 826
NUMBER_OF_BYTES: 35247
_STATISTICS_WRITING_APP: mkvmerge v19.0.0 ('Brave Captain') 32-bit
_STATISTICS_WRITING_DATE_UT: 2017-12-27 17:39:32
_STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

Video
ID: 1
Format: AVC
Format/Info: Advanced Video Codec
Format profile: High@L5.1
Format settings, CABAC: Yes
Format settings, ReFrames: 16 frames
Codec ID: V_MPEG4/ISO/AVC
Duration: 58mn 4s
Nominal bit rate: 5 000 Kbps
Width: 1 920 pixels
Height: 1 080 pixels
Display aspect ratio: 16:9
Frame rate mode: Constant
Frame rate: 23.976 fps
Color space: YUV
Chroma subsampling: 4:2:0
Bit depth: 8 bits
Scan type: Progressive
Bits/(Pixel*Frame): 0.101
Writing library: x264 core 148 r2579 73ae2d1
Encoding settings: cabac=1 / ref=16 / deblock=1:1:1 / analyse=0x3:0x133 / me=umh / subme=10 / psy=1 / psy_rd=0.40:0.00 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=34 / lookahead_threads=8 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=10 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=24 / keyint_min=13 / scenecut=0 / intra_refresh=0 / rc_lookahead=47 / rc=2pass / mbtree=1 / bitrate=5000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=10000 / vbv_bufsize=20000 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:0.60
Language: Japanese
Default: Yes
Forced: No

Audio
ID: 2
Format: AAC
Format/Info: Advanced Audio Codec
Format profile: LC
Codec ID: A_AAC
Duration: 58mn 4s
Channel(s): 2 channels
Channel positions: Front: L R
Sampling rate: 48.0 KHz
Compression mode: Lossy
Language: Japanese
Default: Yes
Forced: No

[sneaker_ger]

to recreate keyframes
To what? Why?

[kostek00]

Because they are every second and making timing to such file is big pain.

[sneaker_ger]

No, it's not possible without re-encoding.

What I would do: re-encode with very fast settings (but enabled scenechange-detection) and use that to time. Afterwards mux the subtitles to the original file so you don't have quality loss.

[kostek00]

Ok, thanks.