Hi, I wish to have an histogram of portion of an audio file, however the seeking (-ss) and cut (-t) operator provide very different histogram results.
Quid re-opening of bug 1727? These are my CLI with -ss before -i ffmpeg -ss 17401 -t 2 -i "20160903 1 oreiller fin 8h08.3gp" -af volumedetect -f null - > histogram17401_front.txt 2>&1 ffmpeg -ss 17401 -i "20160903 1 oreiller fin 8h08.3gp" -t 2 -af volumedetect -f null - > histogram17401_ss_before_i_n_t_after_i.txt 2>&1 ffmpeg -ss 17401 -i "20160903 1 oreiller fin 8h08.3gp" -af volumedetect -t 2 -f null - > histogram17401_ss_before_in_t_after_voldetect.txt 2>&1 These are my CLI with -ss After -i ffmpeg -i "20160903 1 oreiller fin 8h08.3gp" -ss 17401 -t 2 -af volumedetect -f null - > histogram17401_after_i.txt 2>&1 ffmpeg -i "20160903 1 oreiller fin 8h08.3gp" -af volumedetect -ss 17401 -t 2 -f null - > histogram17401_after_voldetect.txt 2>&1 Console output below. Note: the following are different ffmpeg -ss 17401 -t 2 -y -i "20160903 1 oreiller fin 8h08.3gp" -c:a copy front.3gp file duration: 4h44 53sec ffmpeg -ss 17401 -y -i "20160903 1 oreiller fin 8h08.3gp" -t 2 -c:a copy front_t_after.3gp file duration: 2sec ffmpeg -y -i "20160903 1 oreiller fin 8h08.3gp" -ss 17401 -t 2 -c:a copy after.3gp file duration: 2sec RE: https://trac.ffmpeg.org/wiki/Seeking https://trac.ffmpeg.org/ticket/1727 ffmpeg -ss 17401 -t 2 -i "20160903 1 oreiller fin 8h08.3gp" -af volumedetect -f null - > histogram17401_front.txt 2>&1 ffmpeg version 2.8.4 Copyright (c) 2000-2015 the FFmpeg developers built with gcc 5.2.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib 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 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 2.101 / 1. 2.101 libpostproc 53. 3.100 / 53. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '20160903 1 oreiller fin 8h08.3gp': Metadata: major_brand : 3gp4 minor_version : 0 compatible_brands: isom3gp4 creation_time : 2016-09-04 06:08:38 Duration: 09:34:54.02, start: 0.000000, bitrate: 23 kb/s Stream #0:0(eng): Audio: amr_wb (sawb / 0x62776173), 16000 Hz, mono, flt, 23 kb/s (default) Metadata: creation_time : 2016-09-04 06:08:38 handler_name : SoundHandle Output #0, null, to 'pipe:': Metadata: major_brand : 3gp4 minor_version : 0 compatible_brands: isom3gp4 encoder : Lavf56.40.101 Stream #0:0(eng): Audio: pcm_s16le, 16000 Hz, mono, s16, 256 kb/s (default) Metadata: creation_time : 2016-09-04 06:08:38 handler_name : SoundHandle encoder : Lavc56.60.100 pcm_s16le Stream mapping: Stream #0:0 -> #0:0 (amr_wb (amrwb) -> pcm_s16le (native)) Press [q] to stop, [?] for help size=N/A time=00:00:02.00 bitrate=N/A video:0kB audio:62kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown [Parsed_volumedetect_0 @ 02ede740] n_samples: 32000 [Parsed_volumedetect_0 @ 02ede740] mean_volume: -40.4 dB [Parsed_volumedetect_0 @ 02ede740] max_volume: -22.7 dB [Parsed_volumedetect_0 @ 02ede740] histogram_22db: 1 [Parsed_volumedetect_0 @ 02ede740] histogram_23db: 2 [Parsed_volumedetect_0 @ 02ede740] histogram_24db: 4 [Parsed_volumedetect_0 @ 02ede740] histogram_25db: 2 [Parsed_volumedetect_0 @ 02ede740] histogram_26db: 21 [Parsed_volumedetect_0 @ 02ede740] histogram_27db: 27 ffmpeg -i "20160903 1 oreiller fin 8h08.3gp" -ss 17401 -t 2 -af volumedetect -f null - > histogram17401_after_i.txt 2>&1 ffmpeg version 2.8.4 Copyright (c) 2000-2015 the FFmpeg developers built with gcc 5.2.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib 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 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 2.101 / 1. 2.101 libpostproc 53. 3.100 / 53. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '20160903 1 oreiller fin 8h08.3gp': Metadata: major_brand : 3gp4 minor_version : 0 compatible_brands: isom3gp4 creation_time : 2016-09-04 06:08:38 Duration: 09:34:54.02, start: 0.000000, bitrate: 23 kb/s Stream #0:0(eng): Audio: amr_wb (sawb / 0x62776173), 16000 Hz, mono, flt, 23 kb/s (default) Metadata: creation_time : 2016-09-04 06:08:38 handler_name : SoundHandle Output #0, null, to 'pipe:': Metadata: major_brand : 3gp4 minor_version : 0 compatible_brands: isom3gp4 encoder : Lavf56.40.101 Stream #0:0(eng): Audio: pcm_s16le, 16000 Hz, mono, s16, 256 kb/s (default) Metadata: creation_time : 2016-09-04 06:08:38 handler_name : SoundHandle encoder : Lavc56.60.100 pcm_s16le Stream mapping: Stream #0:0 -> #0:0 (amr_wb (amrwb) -> pcm_s16le (native)) Press [q] to stop, [?] for help size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A 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time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:00.00 bitrate=N/A size=N/A time=00:00:02.00 bitrate=N/A video:0kB audio:62kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown [Parsed_volumedetect_0 @ 03008f60] n_samples: 278448320 [Parsed_volumedetect_0 @ 03008f60] mean_volume: -46.0 dB [Parsed_volumedetect_0 @ 03008f60] max_volume: 0.0 dB [Parsed_volumedetect_0 @ 03008f60] histogram_0db: 284 [Parsed_volumedetect_0 @ 03008f60] histogram_1db: 348 [Parsed_volumedetect_0 @ 03008f60] histogram_2db: 477 [Parsed_volumedetect_0 @ 03008f60] histogram_3db: 764 [Parsed_volumedetect_0 @ 03008f60] histogram_4db: 1067 [Parsed_volumedetect_0 @ 03008f60] histogram_5db: 1423 [Parsed_volumedetect_0 @ 03008f60] histogram_6db: 1907 [Parsed_volumedetect_0 @ 03008f60] histogram_7db: 2367 [Parsed_volumedetect_0 @ 03008f60] histogram_8db: 2789 [Parsed_volumedetect_0 @ 03008f60] histogram_9db: 3282 [Parsed_volumedetect_0 @ 03008f60] histogram_10db: 3826 [Parsed_volumedetect_0 @ 03008f60] histogram_11db: 4302 [Parsed_volumedetect_0 @ 03008f60] histogram_12db: 4822 [Parsed_volumedetect_0 @ 03008f60] histogram_13db: 5170 [Parsed_volumedetect_0 @ 03008f60] histogram_14db: 5621 [Parsed_volumedetect_0 @ 03008f60] histogram_15db: 5869 [Parsed_volumedetect_0 @ 03008f60] histogram_16db: 6426 [Parsed_volumedetect_0 @ 03008f60] histogram_17db: 6442 [Parsed_volumedetect_0 @ 03008f60] histogram_18db: 6645 [Parsed_volumedetect_0 @ 03008f60] histogram_19db: 6793 [Parsed_volumedetect_0 @ 03008f60] histogram_20db: 7029 [Parsed_volumedetect_0 @ 03008f60] histogram_21db: 7409 [Parsed_volumedetect_0 @ 03008f60] histogram_22db: 7564 [Parsed_volumedetect_0 @ 03008f60] histogram_23db: 7729 [Parsed_volumedetect_0 @ 03008f60] histogram_24db: 8126 [Parsed_volumedetect_0 @ 03008f60] histogram_25db: 8869 [Parsed_volumedetect_0 @ 03008f60] histogram_26db: 9874 [Parsed_volumedetect_0 @ 03008f60] histogram_27db: 11093 [Parsed_volumedetect_0 @ 03008f60] histogram_28db: 13918 [Parsed_volumedetect_0 @ 03008f60] histogram_29db: 17182 [Parsed_volumedetect_0 @ 03008f60] histogram_30db: 22943 [Parsed_volumedetect_0 @ 03008f60] histogram_31db: 30657 [Parsed_volumedetect_0 @ 03008f60] histogram_32db: 43931 [Parsed_volumedetect_0 @ 03008f60] histogram_33db: 62609 _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
