[FFmpeg-trac] #8189(ffmpeg:new): FFMPEG fails to trim beginning of clip

[FFmpeg]

#8189: FFMPEG fails to trim beginning of clip
------------------------------------+----------------------------------
             Reporter:  mmorin      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  ffmpeg
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+----------------------------------

Comment (by mmorin):

 The output of `ffprobe` suggests that both samples use the same
 compression of h264. I include a log below. Both samples use the same
 coding, intra or non-Intra, so I don't see why it would affect one and not
 the other.

 I read the 8464 bug conversation and don't understand why outpoint and
 floating point precision would help here.

 Results of ffprobe:

 ```
 $ ffprobe 00122.MTS
 ffprobe version 4.2.2 Copyright (c) 2007-2019 the FFmpeg developers
   built with Apple clang version 11.0.0 (clang-1100.0.33.16)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2 --enable-shared
 --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-
 cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.0.1.jdk/Contents/Home/include
 -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.0.1.jdk/Contents/Home/include/darwin
 -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls
 --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame
 --enable-libopus --enable-librubberband --enable-libsnappy --enable-
 libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis
 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid
 --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r
 --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr
 --enable-videotoolbox --disable-libjack --disable-indev=jack
   libavutil      56. 31.100 / 56. 31.100
   libavcodec     58. 54.100 / 58. 54.100
   libavformat    58. 29.100 / 58. 29.100
   libavdevice    58.  8.100 / 58.  8.100
   libavfilter     7. 57.100 /  7. 57.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  5.100 /  5.  5.100
   libswresample   3.  5.100 /  3.  5.100
   libpostproc    55.  5.100 / 55.  5.100
 Input #0, mpegts, from '00122.MTS':
   Duration: 00:12:36.02, start: 1.040000, bitrate: 22490 kb/s
   Program 1
     Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448),
 yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn,
 50 tbc
     Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo,
 fltp, 256 kb/s
     Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] /
 0x0090), 1920x1080

 $ ffprobe 00123.MTS
 ffprobe version 4.2.2 Copyright (c) 2007-2019 the FFmpeg developers
   built with Apple clang version 11.0.0 (clang-1100.0.33.16)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2 --enable-shared
 --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-
 cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.0.1.jdk/Contents/Home/include
 -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.0.1.jdk/Contents/Home/include/darwin
 -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls
 --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame
 --enable-libopus --enable-librubberband --enable-libsnappy --enable-
 libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis
 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid
 --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r
 --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr
 --enable-videotoolbox --disable-libjack --disable-indev=jack
   libavutil      56. 31.100 / 56. 31.100
   libavcodec     58. 54.100 / 58. 54.100
   libavformat    58. 29.100 / 58. 29.100
   libavdevice    58.  8.100 / 58.  8.100
   libavfilter     7. 57.100 /  7. 57.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  5.100 /  5.  5.100
   libswresample   3.  5.100 /  3.  5.100
   libpostproc    55.  5.100 / 55.  5.100
 Input #0, mpegts, from '00123.MTS':
   Duration: 00:12:36.55, start: 756.592000, bitrate: 22479 kb/s
   Program 1
     Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448),
 yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn,
 50 tbc
     Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo,
 fltp, 256 kb/s
     Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] /
 0x0090), 1920x1080
 ```

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8189#comment:5>
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