I believe this should be a viable routine for two-pass encoding using libx264,
but it fails, as shown. A similar command to encode the same video source file
using libx265 with Matroska output is successful, so I don’t think the source
file is the culprit. Both the x264 and x265 encoding report 1475 frames
encoded. Please help. Thanks.
Sincerely,
L. Lee
ffmpeg -i ~/Downloads/sgd.ts -map 0:0 -c:v:0 libx264 -b:v 2500k -pass 1 -vf
fieldmatch=order=tff:combmatch=none,decimate,crop=1920:1072:0:4 -map 0:1 -an -f
null /dev/null && ffmpeg -i ~/Downloads/sgd.ts -map 0:0 -c:v:0 libx264 -b:v
2500k -pass 2 -vf
fieldmatch=order=tff:combmatch=none,decimate,crop=1920:1072:0:4 -map 0:1 -c:a
ac3 -b:a 384k -movflags +faststart ~/Downloads/sgd.mp4
ffmpeg version 6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1_3 --enable-shared
--enable-pthreads --enable-version3 --cc=clang --host-cflags=
--host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl
--enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d
--enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus
--enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy
--enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract
--enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis
--enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig
--enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino
--enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg
--disable-libjack --disable-indev=jack --enable-videotoolbox
--enable-audiotoolbox --enable-neon
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
libpostproc 57. 3.100 / 57. 3.100
Input #0, mpegts, from '/Users/llee/Downloads/sgd.ts':
Duration: 00:01:02.11, start: 1.400000, bitrate: 14865 kb/s
Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv,
bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 90k tbn
Stream #0:1[0x101]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side),
fltp, 640 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x13c605d00] using SAR=1/1
[libx264 @ 0x13c605d00] using cpu capabilities: ARMv8 NEON
[libx264 @ 0x13c605d00] profile Main, level 4.0, 4:2:0, 8-bit
Output #0, null, to '/dev/null':
Metadata:
encoder : Lavf60.16.100
Stream #0:0: Video: h264, yuv420p(tv, bt709, progressive), 1920x1072 [SAR 1:1
DAR 120:67], q=2-31, 2500 kb/s, 24 fps, 24 tbn
Metadata:
encoder : Lavc60.31.102 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/2500000 buffer size: 0 vbv_delay: N/A
[out#0/null @ 0x6000004ac180] video:20127kB audio:0kB subtitle:0kB other
streams:0kB global headers:0kB muxing overhead: unknown
frame= 1475 fps= 93 q=-1.0 Lsize=N/A time=00:01:01.37 bitrate=N/A speed=3.87x
[libx264 @ 0x13c605d00] frame I:26 Avg QP:20.39 size: 77028
[libx264 @ 0x13c605d00] frame P:450 Avg QP:23.72 size: 23644
[libx264 @ 0x13c605d00] frame B:999 Avg QP:25.04 size: 7975
[libx264 @ 0x13c605d00] consecutive B-frames: 9.0% 1.4% 2.0% 87.6%
[libx264 @ 0x13c605d00] mb I I16..4: 64.1% 0.0% 35.9%
[libx264 @ 0x13c605d00] mb P I16..4: 33.0% 0.0% 0.0% P16..4: 34.8% 0.0%
0.0% 0.0% 0.0% skip:32.2%
[libx264 @ 0x13c605d00] mb B I16..4: 5.5% 0.0% 0.0% B16..8: 19.6% 0.0%
0.0% direct: 9.1% skip:65.8% L0:39.4% L1:54.2% BI: 6.4%
[libx264 @ 0x13c605d00] final ratefactor: 24.22
[libx264 @ 0x13c605d00] coded y,uvDC,uvAC intra: 29.9% 40.3% 6.3% inter: 6.1%
10.3% 0.0%
[libx264 @ 0x13c605d00] i16 v,h,dc,p: 35% 23% 26% 17%
[libx264 @ 0x13c605d00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 20% 22% 3% 9% 6%
6% 5% 5%
[libx264 @ 0x13c605d00] i8c dc,h,v,p: 56% 20% 21% 3%
[libx264 @ 0x13c605d00] Weighted P-Frames: Y:2.0% UV:0.9%
[libx264 @ 0x13c605d00] kb/s:2682.78
ffmpeg version 6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1_3 --enable-shared
--enable-pthreads --enable-version3 --cc=clang --host-cflags=
--host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl
--enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d
--enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus
--enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy
--enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract
--enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis
--enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig
--enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino
--enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg
--disable-libjack --disable-indev=jack --enable-videotoolbox
--enable-audiotoolbox --enable-neon
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
libpostproc 57. 3.100 / 57. 3.100
Input #0, mpegts, from '/Users/llee/Downloads/sgd.ts':
Duration: 00:01:02.11, start: 1.400000, bitrate: 14865 kb/s
Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv,
bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 90k tbn
Stream #0:1[0x101]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side),
fltp, 640 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (ac3 (native) -> ac3 (native))
Press [q] to stop, [?] for help
[libx264 @ 0x159f07480] using SAR=1/1
[libx264 @ 0x159f07480] using cpu capabilities: ARMv8 NEON
[libx264 @ 0x159f07480] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 0x159f07480] 264 - core 164 r3108 31e19f9 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2023 - http://www.videolan.org/x264.html - options: cabac=1 ref=3
deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00
mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11
fast_pskip=1 chroma_qp_offset=-2 threads=15 lookahead_threads=2
sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0
constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1
open_gop=0 weightp=2 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0
rc_lookahead=40 rc=2pass mbtree=1 bitrate=2500 ratetol=1.0 qcomp=0.60 qpmin=0
qpmax=69 qpstep=4 cplxblur=20.0 qblur=0.5 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '/Users/llee/Downloads/sgd.mp4':
Metadata:
encoder : Lavf60.16.100
Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709,
progressive), 1920x1072 [SAR 1:1 DAR 120:67], q=2-31, 2500 kb/s, 24 fps, 12288
tbn
Metadata:
encoder : Lavc60.31.102 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/2500000 buffer size: 0 vbv_delay: N/A
Stream #0:1: Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 384
kb/s
Metadata:
encoder : Lavc60.31.102 ac3
[libx264 @ 0x159f07480] 2nd pass has more frames than 1st pass
(1475)720.9kbits/s dup=15 drop=0 speed=3.88x
[libx264 @ 0x159f07480] continuing anyway, at constant QP=26
[libx264 @ 0x159f07480] disabling adaptive B-frames
[1] 63630 segmentation fault ffmpeg -i ~/Downloads/sgd.ts -map 0:0 -c:v:0
libx264 -b:v 2500k -pass 2 -vf
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