[FFmpeg-user] Unexpected additional frames while stream copy
Ulf Zibis
Ulf.Zibis at CoSoCo.de
Sun Oct 1 20:28:31 EEST 2023
Hi,
I have a video, grabbed from screen with "-c:v libx264rgb -crf 0 -preset ultrafast".
When I re-encode a small scene out of it, it counts 576 frames. (Same number of images, when I extract all frames as JPEG.)
But when I just do a stream copy, I get 761 frames, even when I use "-fps_mode:v passthrough", which should be superfluous.
Can one explain this miracle?
$ ffmpeg -ss 1:24:43 -t 50 -i roh_de.mkv -fps_mode:v passthrough -c:v libx264rgb -crf 0 -preset veryslow -c:a copy roh_de_slow.mkv
ffmpeg version 5.1.1-1ubuntu2.1 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 12 (Ubuntu 12.2.0-3ubuntu1)
configuration: --prefix=/usr --extra-version=1ubuntu2.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid
--enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --disable-sndio --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-shared
libavutil 57. 28.100 / 57. 28.100
libavcodec 59. 37.100 / 59. 37.100
libavformat 59. 27.100 / 59. 27.100
libavdevice 59. 7.100 / 59. 7.100
libavfilter 8. 44.100 / 8. 44.100
libswscale 6. 7.100 / 6. 7.100
libswresample 4. 7.100 / 4. 7.100
libpostproc 56. 6.100 / 56. 6.100
Input #0, matroska,webm, from 'roh_de.mkv':
Metadata:
ENCODER : Lavf59.27.100
Duration: 02:34:59.82, start: 0.000000, bitrate: 80644 kb/s
Stream #0:0: Video: h264 (High 4:4:4 Predictive), gbrp(pc, gbr/unknown/unknown, progressive), 1680x888 [SAR 1:1 DAR 70:37], 25 fps, 25 tbr, 1k tbn
Metadata:
DURATION : 02:34:59,760000000
Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp
Metadata:
DURATION : 02:34:59,818000000
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264rgb))
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[libx264rgb @ 0x558efa1dde80] using SAR=1/1
[libx264rgb @ 0x558efa1dde80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
[libx264rgb @ 0x558efa1dde80] profile High 4:4:4 Predictive, level 5.0, 4:4:4, 8-bit
[libx264rgb @ 0x558efa1dde80] 264 - core 164 r3095 baee400 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=9 psy=0 mixed_ref=1 me_range=24 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=0
Output #0, matroska, to 'roh_de_slow.mkv':
Metadata:
encoder : Lavf59.27.100
Stream #0:0: Video: h264 (H264 / 0x34363248), rgb24(pc, gbr/unknown/unknown, progressive), 1680x888 [SAR 1:1 DAR 70:37], q=2-31, 25 fps, 1k tbn
Metadata:
DURATION : 02:34:59,760000000
encoder : Lavc59.37.100 libx264rgb
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp
Metadata:
DURATION : 02:34:59,818000000
frame= 576 fps=0.7 q=-1.0 Lsize= 620554kB time=00:00:50.01 bitrate=101645.2kbits/s speed=0.064x
video:619584kB audio:944kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.004287%
[libx264rgb @ 0x558efa1dde80] frame I:48 Avg QP: 0.00 size:899822
[libx264rgb @ 0x558efa1dde80] frame P:528 Avg QP: 0.00 size:1119814
[libx264rgb @ 0x558efa1dde80] mb I I16..4..PCM: 46.5% 17.4% 36.1% 0.0%
[libx264rgb @ 0x558efa1dde80] mb P I16..4..PCM: 25.9% 10.3% 23.3% 0.0% P16..4: 7.4% 2.3% 10.1% 5.7% 8.7% skip: 6.4%
[libx264rgb @ 0x558efa1dde80] 8x8 transform intra:17.4% inter:16.2%
[libx264rgb @ 0x558efa1dde80] coded y,u,v intra: 88.7% 84.4% 90.1% inter: 80.2% 79.4% 80.7%
[libx264rgb @ 0x558efa1dde80] i16 v,h,dc,p: 47% 53% 0% 0%
[libx264rgb @ 0x558efa1dde80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 49% 47% 2% 0% 1% 0% 0% 0% 0%
[libx264rgb @ 0x558efa1dde80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 42% 44% 1% 2% 3% 3% 3% 2% 1%
[libx264rgb @ 0x558efa1dde80] Weighted P-Frames: Y:66.1% UV:64.6%
[libx264rgb @ 0x558efa1dde80] ref P L0: 41.8% 5.3% 9.1% 14.8% 7.2% 6.2% 3.8% 2.9% 1.8% 1.9% 1.3% 1.2% 0.6% 1.1% 0.5% 0.4%
[libx264rgb @ 0x558efa1dde80] kb/s:101512.49
$ ffmpeg -ss 1:24:43 -t 50 -i roh_de.mkv -c copy -fps_mode:v passthrough roh_de_fast.mkv
ffmpeg version 5.1.1-1ubuntu2.1 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 12 (Ubuntu 12.2.0-3ubuntu1)
configuration: --prefix=/usr --extra-version=1ubuntu2.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid
--enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --disable-sndio --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-shared
libavutil 57. 28.100 / 57. 28.100
libavcodec 59. 37.100 / 59. 37.100
libavformat 59. 27.100 / 59. 27.100
libavdevice 59. 7.100 / 59. 7.100
libavfilter 8. 44.100 / 8. 44.100
libswscale 6. 7.100 / 6. 7.100
libswresample 4. 7.100 / 4. 7.100
libpostproc 56. 6.100 / 56. 6.100
Input #0, matroska,webm, from 'roh_de.mkv':
Metadata:
ENCODER : Lavf59.27.100
Duration: 02:34:59.82, start: 0.000000, bitrate: 80644 kb/s
Stream #0:0: Video: h264 (High 4:4:4 Predictive), gbrp(pc, gbr/unknown/unknown, progressive), 1680x888 [SAR 1:1 DAR 70:37], 25 fps, 25 tbr, 1k tbn
Metadata:
DURATION : 02:34:59,760000000
Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp
Metadata:
DURATION : 02:34:59,818000000
Output #0, matroska, to 'roh_de_fast.mkv':
Metadata:
encoder : Lavf59.27.100
Stream #0:0: Video: h264 (High 4:4:4 Predictive) (H264 / 0x34363248), gbrp(pc, gbr/unknown/unknown, progressive), 1680x888 [SAR 1:1 DAR 70:37], q=2-31, 25 fps, 25 tbr, 1k tbn
Metadata:
DURATION : 02:34:59,760000000
Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, fltp
Metadata:
DURATION : 02:34:59,818000000
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 761 fps=9.6 q=-1.0 Lsize= 876100kB time=00:00:50.01 bitrate=143502.8kbits/s speed=0.633x
video:875127kB audio:944kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.003238%
-Ulf
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