#10102: lavfi color background with clear png creating extra frames -------------------------------------+------------------------------------- Reporter: seankennett | Type: defect Status: new | Priority: normal Component: ffmpeg | Version: git- Keywords: overlay | master image2 filter_complex | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- I have 64 png images with transparent backgrounds which I want to overlay onto a plain black background. The issue I have is that additional black frames are added to the end of the video. Some of the images are completely transparent which seem to be the cause of the issue. Replacing these fully transparent images with partially transparent images works as expected. With fully transparent the length of video is 5.333 seconds, without is the expected length of 2.667. ffmpeg -framerate 24 -i %d.png -f lavfi -i color=0x000000@1:s=1920x1080:r=24 -filter_complex "[1:v]trim=end_frame=64[b0];[b0][0:v]overlay" Recreate24.mp4 using latest master build: ffmpeg version 2022-12-11-git-c3e20f78b0-essentials_build-www.gyan.dev stack: ffmpeg -framerate 24 -i %d.png -f lavfi -i color=0x000000@1:s=1920x1080:r=24 -filter_complex "[1:v]trim=end_frame=64[b0];[b0][0:v]overlay" Recreate24.mp4 ffmpeg version 2022-12-11-git-c3e20f78b0-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers built with gcc 12.1.0 (Rev2, Built by MSYS2 project) configuration: --enable-gpl --enable-version3 --enable-static --disable- w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable- avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable- libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable- amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable- libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable- libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband libavutil 57. 43.100 / 57. 43.100 libavcodec 59. 55.100 / 59. 55.100 libavformat 59. 34.102 / 59. 34.102 libavdevice 59. 8.101 / 59. 8.101 libavfilter 8. 52.100 / 8. 52.100 libswscale 6. 8.112 / 6. 8.112 libswresample 4. 9.100 / 4. 9.100 libpostproc 56. 7.100 / 56. 7.100 Input #0, image2, from '%d.png': Duration: 00:00:02.67, start: 0.000000, bitrate: N/A Stream #0:0: Video: png, monob(pc), 1920x1080, 24 fps, 24 tbr, 24 tbn Input #1, lavfi, from 'color=0x000000@1:s=1920x1080:r=24': Duration: N/A, start: 0.000000, bitrate: N/A Stream #1:0: Video: wrapped_avframe, yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 24 tbn File 'Recreate24.mp4' already exists. Overwrite? [y/N] y Stream mapping: Stream #0:0 (png) -> overlay Stream #1:0 (wrapped_avframe) -> trim:default overlay:default -> Stream #0:0 (libx264) Press [q] to stop, [?] for help [image2 @ 0000025ca857dcc0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8) [libx264 @ 0000025ca8bbadc0] using SAR=1/1 [libx264 @ 0000025ca8bbadc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 [libx264 @ 0000025ca8bbadc0] profile High, level 4.0, 4:2:0, 8-bit [libx264 @ 0000025ca8bbadc0] 264 - core 164 r3102 416e3eb - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - 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=9 lookahead_threads=1 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=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 'Recreate24.mp4': Metadata: encoder : Lavf59.34.102 Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 24 fps, 12288 tbn Metadata: encoder : Lavc59.55.100 libx264 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A frame= 128 fps= 65 q=-1.0 Lsize= 189kB time=00:00:05.20 bitrate= 296.5kbits/s dup=4 drop=0 speed=2.63x video:186kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.242933% [libx264 @ 0000025ca8bbadc0] frame I:2 Avg QP: 6.14 size: 3302 [libx264 @ 0000025ca8bbadc0] frame P:34 Avg QP:16.27 size: 2692 [libx264 @ 0000025ca8bbadc0] frame B:92 Avg QP:17.66 size: 999 [libx264 @ 0000025ca8bbadc0] consecutive B-frames: 1.6% 3.1% 14.1% 81.2% [libx264 @ 0000025ca8bbadc0] mb I I16..4: 78.7% 20.5% 0.8% [libx264 @ 0000025ca8bbadc0] mb P I16..4: 0.1% 0.5% 0.5% P16..4: 0.6% 0.4% 0.2% 0.0% 0.0% skip:97.8% [libx264 @ 0000025ca8bbadc0] mb B I16..4: 0.0% 0.0% 0.1% B16..8: 1.1% 0.3% 0.1% direct: 0.1% skip:98.3% L0:52.8% L1:44.2% BI: 3.0% [libx264 @ 0000025ca8bbadc0] 8x8 transform intra:24.5% inter:16.0% [libx264 @ 0000025ca8bbadc0] coded y,uvDC,uvAC intra: 6.6% 10.0% 9.6% inter: 0.3% 0.3% 0.2% [libx264 @ 0000025ca8bbadc0] i16 v,h,dc,p: 97% 1% 2% 0% [libx264 @ 0000025ca8bbadc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 59% 3% 36% 0% 0% 0% 0% 0% 1% [libx264 @ 0000025ca8bbadc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 20% 31% 4% 7% 6% 6% 3% 4% [libx264 @ 0000025ca8bbadc0] i8c dc,h,v,p: 93% 3% 3% 0% [libx264 @ 0000025ca8bbadc0] Weighted P-Frames: Y:8.8% UV:5.9% [libx264 @ 0000025ca8bbadc0] ref P L0: 51.1% 6.3% 17.3% 25.3% [libx264 @ 0000025ca8bbadc0] ref B L0: 77.5% 19.2% 3.3% [libx264 @ 0000025ca8bbadc0] ref B L1: 94.0% 6.0% [libx264 @ 0000025ca8bbadc0] kb/s:284.98 -- Ticket URL: <https://trac.ffmpeg.org/ticket/10102> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker