[FFmpeg-trac] #11337(undetermined:new): asegment with relative timestamps creates segments with wrong duration

[FFmpeg]

#11337: asegment with relative timestamps creates segments with wrong duration
-------------------------------------+-------------------------------------
             Reporter:  pablo        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: asegment with relative timestamps produces segments
 with wrong duration. Absolute timestamps works as exepcted.
 How to reproduce:
 Use the first wav from here:
 https://www2.cs.uic.edu/~i101/SoundFiles/
 The third segment has duration N/A.
 {{{
 ffmpeg -i BabyElephantWalk60.wav -filter_complex
 "asegment=timestamps=1000ms|+1000ms|+1000ms[1][2][3][4]" -map "[1]"
 test1.wav -map "[2]" test2.wav -map "[3]" test3.wav -map "[4]" test4.wav
 ffmpeg version 5.1.6-0+deb12u1 Copyright (c) 2000-2024 the FFmpeg
 developers
   built with gcc 12 (Debian 12.2.0-14)
   configuration: --prefix=/usr --extra-version=0+deb12u1
 --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-libjxl --enable-
 pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-
 libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-
 libx264 --enable-libplacebo --enable-librav1e --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
 Guessed Channel Layout for Input Stream #0.0 : mono
 Input #0, wav, from 'BabyElephantWalk60.wav':
   Duration: 00:01:00.00, bitrate: 352 kb/s
   Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono,
 s16, 352 kb/s
 Stream mapping:
   Stream #0:0 (pcm_s16le) -> asegment:default
   asegment -> Stream #0:0 (pcm_s16le)
   asegment -> Stream #1:0 (pcm_s16le)
   asegment -> Stream #2:0 (pcm_s16le)
   asegment -> Stream #3:0 (pcm_s16le)
 Press [q] to stop, [?] for help
 Output #0, wav, to 'test1.wav':
   Metadata:
     ISFT            : Lavf59.27.100
   Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono,
 s16, 352 kb/s
     Metadata:
       encoder         : Lavc59.37.100 pcm_s16le
 Output #1, wav, to 'test2.wav':
   Metadata:
     ISFT            : Lavf59.27.100
   Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono,
 s16, 352 kb/s
     Metadata:
       encoder         : Lavc59.37.100 pcm_s16le
 Output #2, wav, to 'test3.wav':
   Metadata:
     ISFT            : Lavf59.27.100
   Stream #2:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono,
 s16, 352 kb/s
     Metadata:
       encoder         : Lavc59.37.100 pcm_s16le
 Output #3, wav, to 'test4.wav':
   Metadata:
     ISFT            : Lavf59.27.100
   Stream #3:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono,
 s16, 352 kb/s
     Metadata:
       encoder         : Lavc59.37.100 pcm_s16le
 size=      43kB time=00:01:00.00 bitrate=   5.9kbits/s speed=3.19e+03x
 video:0kB audio:2584kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}

 You can also try:
 ffmpeg -v verbose -y -lavfi "sine=d=10,asegment=timestamps=1|+1|+1" -c:a
 pcm_s16le out.mka 2>&1

 ffmpeg -v verbose -y -lavfi "sine=d=10,asegment=timestamps=1|+2|+2" -c:a
 pcm_s16le out.mka 2>&1
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11337>
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