I want to cut a video with optimally no recoding, or only a bit of
recoding at the beginning and the end, or if recoding is necessary, only
for the audio track.
I tried this:
$ ffmpeg -ss 00:02 -i 00078.MTS -vcodec copy -acodec ac3 -b:a 256k cut.mts
However, cut.mts contains only audio, no video anymore:
$ ffmpeg -i cut.mts
ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1
--build-suffix=-ffmpeg --toolchain=hardened
--libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu
--cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping
--disable-decoder=libopenjpeg --disable-decoder=libschroedinger
--enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libflite --enable-libfontconfig
--enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm
--enable-libmodplug --enable-libmp3lame --enable-libopenjpeg
--enable-libopus --enable-libpulse --enable-librtmp
--enable-libschroedinger --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora
--enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack
--enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi
--enable-openal --enable-opengl --enable-x11grab --enable-libdc1394
--enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264
--enable-libopencv
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
[h264 @ 0x1087c40] start time for stream 0 is not set in
estimate_timings_from_pts
[mpegts @ 0x10837a0] Could not find codec parameters for stream 0 (Video:
h264 ([27][0][0][0] / 0x001B), none): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mpegts, from '/tmp/cut.mts':
Duration: 00:00:04.26, start: 1.400000, bitrate: 297 kb/s
Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Video: h264 ([27][0][0][0] / 0x001B), none, 90k tbr,
90k tbn, 180k tbc
Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo,
fltp, 256 kb/s
At least one output file must be specified
Is this a bug or am I doing something wrong?
You can find my small test video here:
http://sim.mathematik.uni-halle.de/~henning/video/00078.MTS
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