I want to publish a speech I gave during a Zoom meeting. But cutting
it out does not work.
When I use:
ffmpeg -y -i 2021-03-25ToastmastersClubAvond.mp4 -ss 1190 -to 1631 -acodec
copy -vcodec copy -async 1 speech.mp4
The video starts just a bit to late. But when I use:
ffmpeg -y -i 2021-03-25ToastmastersClubAvond.mp4 -ss 1185 -to 1631 -acodec
copy -vcodec copy -async 1 speech.mp4
which is five seconds earlier. I get the same output.
Am I doing something wrong?
Output:
ffmpeg version 4.1.6-1~deb10u1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 8 (Debian 8.3.0-6)
configuration: --prefix=/usr --extra-version='1~deb10u1' --toolchain=hardened
--libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu
--arch=amd64 --enable-gpl --disable-stripping --enable-avresample
--disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa
--enable-libaom --enable-libass --enable-libbluray --enable-libbs2b
--enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme
--enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa
--enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse
--enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora
--enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2
--enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx
--enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394
--enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r
--enable-libx264 --enable-shared
libavutil 56. 22.100 / 56. 22.100
libavcodec 58. 35.100 / 58. 35.100
libavformat 58. 20.100 / 58. 20.100
libavdevice 58. 5.100 / 58. 5.100
libavfilter 7. 40.101 / 7. 40.101
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 3.100 / 5. 3.100
libswresample 3. 3.100 / 3. 3.100
libpostproc 55. 3.100 / 55. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2021-03-25ToastmastersClubAvond.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2021-03-25T19:02:11.000000Z
Duration: 01:34:26.16, start: 0.000000, bitrate: 2198 kb/s
Chapter #0:0: start 0.000000, end 4016.120000
Metadata:
title : Recording Started
Chapter #0:1: start 4016.120000, end 4048.200000
Metadata:
title : Sharing Started
Chapter #0:2: start 4048.200000, end 5666.160000
Metadata:
title : Sharing Stopped
Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono,
fltp, 126 kb/s (default)
Metadata:
creation_time : 2021-03-25T19:02:11.000000Z
handler_name : AAC audio
Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1920x1080, 2070 kb/s, 25 fps, 25 tbr, 30k tbn, 60k tbc (default)
Metadata:
creation_time : 2021-03-25T19:02:11.000000Z
handler_name : H.264/AVC video
encoder : AVC Coding
Stream #0:2(und): Data: bin_data (text / 0x74786574)
Metadata:
creation_time : 2021-03-25T19:02:11.000000Z
handler_name : Text
Output #0, mp4, to 'speech.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
encoder : Lavf58.20.100
Chapter #0:0: start 0.000000, end 446.000000
Metadata:
title : Recording Started
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1920x1080, q=2-31, 2070 kb/s, 25 fps, 25 tbr, 30k tbn, 30k tbc (default)
Metadata:
creation_time : 2021-03-25T19:02:11.000000Z
handler_name : H.264/AVC video
encoder : AVC Coding
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono,
fltp, 126 kb/s (default)
Metadata:
creation_time : 2021-03-25T19:02:11.000000Z
handler_name : AAC audio
Stream mapping:
Stream #0:1 -> #0:0 (copy)
Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 0 fps=0.0 q=-1.0 size= 0kB time=00:00:00.00 bitrate=N/A speed=
0x .frame= 2057 fps=2057 q=-1.0 size= 39168kB time=00:01:27.80
bitrate=3654.5kbits/s speed=87.8x .frame= 7885 fps=5256 q=-1.0 size=
154112kB time=00:05:21.27 bitrate=3929.6kbits/s speed= 214x .frame=11017
fps=5760 q=-1.0 Lsize= 232009kB time=00:07:25.97 bitrate=4261.7kbits/s speed=
233x
video:224885kB audio:6873kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.107917%
--
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof
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