I'm trying to concatenate multiple videos using filter_complex.
Problem is, the movie filter always removes the last frame.
The more movie filters there are, the more frames are removed
here are example commands to reproduce the problem
ffmpeg -y -s 640x480 -f rawvideo -pix_fmt rgb24 -r 60 -i /dev/zero -vf
"drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeMono.ttf:
text=%{n}: x=(w-tw)/2: y=h-(2*lh): fontcolor=white: box=1:
boxcolor=0x000000FF" -an -vcodec libx264 -preset fast -bf 0 -crf 24
-pix_fmt yuv420p -shortest -t 5 a.mp4
ffmpeg -y -s 640x480 -f rawvideo -pix_fmt rgb24 -r 60 -i /dev/zero -vf
"drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeMono.ttf:
text=%{n}: x=(w-tw)/2: y=h-(2*lh): fontcolor=white: box=1:
boxcolor=0x000000FF" -an -vcodec libx264 -preset fast -bf 0 -crf 24
-pix_fmt yuv420p -shortest -t 5 b.mp4
ffmpeg -y -i a.mp4 -i b.mp4 -filter_complex
"[0:v]setpts=PTS-STARTPTS[i0];[1:v]setpts=PTS-STARTPTS[i1];[i0][i1]concat=n=2:v=1,fps=60[outv]"
-map "[outv]" -an -codec:v libx264 -crf 23 -preset fast i.mp4
ffmpeg -y -i a.mp4 -filter_complex
"[0:v]setpts=PTS-STARTPTS[i0];movie=b.mp4,setpts=PTS-STARTPTS[i1];[i0][i1]concat=n=2:v=1,fps=60[outv]"
-map "[outv]" -an -codec:v libx264 -crf 23 -preset fast movie.mp4
ffprobe -v error -i a.mp4 -select_streams v -show_packets | grep flags |
sort | uniq -c
ffprobe -v error -i b.mp4 -select_streams v -show_packets | grep flags |
sort | uniq -c
# there should be a + b nb of frames, 600 frames
298 flags=__
2 flags=K_
298 flags=__
2 flags=K_
ffprobe -v error -i i.mp4 -select_streams v -show_packets | grep flags |
sort | uniq -c
# it works
597 flags=__
3 flags=K_
ffprobe -v error -i movie.mp4 -select_streams v -show_packets | grep flags
| sort | uniq -c
# missing 1
596 flags=__
3 flags=K_
duration also shows the same
ffprobe i.mp4
Duration: 00:00:10.00, start: 0.000000, bitrate: 38 kb/s
$ ffprobe movie.mp4
Duration: 00:00:09.98, start: 0.000000, bitrate: 38 kb/s
Tried with 5.1.3 and master from git
$ ./ffmpeg -y -i a.mp4 -filter_complex
"[0:v]setpts=PTS-STARTPTS[i0];movie=b.mp4,setpts=PTS-STARTPTS[i1];[i0][i1]concat=n=2:v=1,fps=60[outv]"
-map "[outv]" -an -codec:v libx264 -crf 23 -preset fast movie.mp4
ffmpeg version N-115009-g2d5fa816fb Copyright (c) 2000-2024 the FFmpeg
developers
built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
configuration: --enable-libxml2 --enable-libfreetype --enable-gpl
--enable-libx264 --enable-libx265 --enable-nonfree --enable-libopus
--enable-libvpx --enable-openssl --enable-static --enable-libpulse
--enable-sdl2 --enable-libharfbuzz
libavutil 59. 16.101 / 59. 16.101
libavcodec 61. 5.103 / 61. 5.103
libavformat 61. 3.103 / 61. 3.103
libavdevice 61. 2.100 / 61. 2.100
libavfilter 10. 2.101 / 10. 2.101
libswscale 8. 2.100 / 8. 2.100
libswresample 5. 2.100 / 5. 2.100
libpostproc 58. 2.100 / 58. 2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf61.3.103
Duration: 00:00:05.00, start: 0.000000, bitrate: 34 kb/s
Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661),
yuv420p(progressive), 640x480, 31 kb/s, 60 fps, 60 tbr, 15360 tbn (default)
Metadata:
handler_name : VideoHandler
vendor_id : [0][0][0][0]
encoder : Lavc61.5.103 libx264
Stream mapping:
Stream #0:0 (h264) -> setpts:default
fps:default -> Stream #0:0 (libx264)
Press [q] to stop, [?] for help
[libx264 @ 0x63454b41ca40] using SAR=1/1
[libx264 @ 0x63454b41ca40] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x63454b41ca40] profile High, level 3.1, 4:2:0, 8-bit
[libx264 @ 0x63454b41ca40] 264 - core 163 r3060 5db6aa6 - H.264/MPEG-4 AVC
codec - Copyleft 2003-2021 - http://www.videolan.org/x264.html - options:
cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 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=1 keyint=250 keyint_min=25
scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf mbtree=1 crf=23.0
qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'movie.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf61.3.103
Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(progressive),
640x480 [SAR 1:1 DAR 4:3], q=2-31, 60 fps, 15360 tbn
Metadata:
encoder : Lavc61.5.103 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
[out#0/mp4 @ 0x63454b4960c0] video:37KiB audio:0KiB subtitle:0KiB other
streams:0KiB global headers:0KiB muxing overhead: 21.353021%
frame= 599 fps=0.0 q=-1.0 Lsize= 45KiB time=00:00:09.95 bitrate=
36.8kbits/s speed=35.8x
[libx264 @ 0x63454b41ca40] frame I:3 Avg QP:10.01 size: 238
[libx264 @ 0x63454b41ca40] frame P:151 Avg QP:13.09 size: 88
[libx264 @ 0x63454b41ca40] frame B:445 Avg QP:16.56 size: 52
[libx264 @ 0x63454b41ca40] consecutive B-frames: 0.5% 1.0% 1.0% 97.5%
[libx264 @ 0x63454b41ca40] mb I I16..4: 99.8% 0.1% 0.2%
[libx264 @ 0x63454b41ca40] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 0.1%
0.0% 0.0% 0.0% 0.0% skip:99.8%
[libx264 @ 0x63454b41ca40] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.1%
0.0% 0.0% direct: 0.0% skip:99.9% L0:49.8% L1:38.8% BI:11.4%
[libx264 @ 0x63454b41ca40] 8x8 transform intra:0.6% inter:0.8%
[libx264 @ 0x63454b41ca40] coded y,uvDC,uvAC intra: 1.2% 0.0% 0.0% inter:
0.1% 0.0% 0.0%
[libx264 @ 0x63454b41ca40] i16 v,h,dc,p: 96% 1% 3% 0%
[libx264 @ 0x63454b41ca40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 7% 56% 2%
0% 1% 0% 0% 1%
[libx264 @ 0x63454b41ca40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 13% 38% 9%
2% 2% 2% 4% 5%
[libx264 @ 0x63454b41ca40] i8c dc,h,v,p: 100% 0% 0% 0%
[libx264 @ 0x63454b41ca40] Weighted P-Frames: Y:2.0% UV:0.0%
[libx264 @ 0x63454b41ca40] ref P L0: 60.6% 39.4%
[libx264 @ 0x63454b41ca40] ref B L0: 82.0% 18.0%
[libx264 @ 0x63454b41ca40] ref B L1: 90.3% 9.7%
[libx264 @ 0x63454b41ca40] kb/s:29.68
am I doing something wrong?
Thanks
Louis
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