[FFmpeg-trac] #5290(avcodec:new): FFMPEG adds delay when converting into WAV

FFmpeg trac at avcodec.org
Sat Mar 5 14:03:43 CET 2016


#5290: FFMPEG adds delay when converting into WAV
-----------------------------------+--------------------------------------
             Reporter:  xtemp09    |                     Type:  defect
               Status:  new        |                 Priority:  important
            Component:  avcodec    |                  Version:  git-master
             Keywords:  delay WAV  |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
-----------------------------------+--------------------------------------
 When converting a file into WAV with FFMPEG, the program adds a delay of
 0.02-0.04 s in the beginning of the file, i. e. 50 conversions gives 1
 second of the delay.


 {{{
 # ffmpeg -i ffmpeg_aac_128k.m4a -c:a pcm_s16le 1.wav
 ffmpeg version N-53341-gbd9c587-static http://johnvansickle.com/ffmpeg/
 Copyright (c) 2000-2016 the FFmpeg developers
   built with gcc 5.3.1 (Debian 5.3.1-10) 20160224
   configuration: --enable-gpl --enable-version3 --disable-shared
 --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-
 libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-
 libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig
 --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libtheora --enable-libvo-amrwbenc --enable-gray --enable-
 libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-
 libvidstab --enable-libsoxr --enable-frei0r --enable-libfribidi --disable-
 indev=sndio --disable-outdev=sndio --enable-librtmp --enable-libmfx
 --cc=gcc
   libavutil      55. 19.100 / 55. 19.100
   libavcodec     57. 27.101 / 57. 27.101
   libavformat    57. 27.101 / 57. 27.101
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 38.100 /  6. 38.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'ffmpeg_aac_128k.m4a':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2mp41
     title           : For Amelie [New Version - Bonus Track]
     artist          : Leaves' Eyes
     album           : Vinland Saga
     date            : 2005
     encoder         : Lavf57.27.100
     genre           : Symphonic Gothic Metal
     track           : 14/14
   Duration: 00:00:09.47, start: 0.023220, bitrate: 129 kb/s
     Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
 stereo, fltp, 127 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
 Output #0, wav, to '1.wav':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2mp41
     INAM            : For Amelie [New Version - Bonus Track]
     IART            : Leaves' Eyes
     IPRD            : Vinland Saga
     ICRD            : 2005
     IPRT            : 14/14
     IGNR            : Symphonic Gothic Metal
     ISFT            : Lavf57.27.101
     Stream #0:0(und): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz,
 stereo, s16, 1411 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
       encoder         : Lavc57.27.101 pcm_s16le
 Stream mapping:
   Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 size=    1632kB time=00:00:09.47 bitrate=1411.4kbits/s speed=85.7x
 video:0kB audio:1632kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.013763%


 # ffprobe ffmpeg_aac_128k.m4a
 ffprobe version N-48618-g9ec17e4-static http://johnvansickle.com/ffmpeg/
 Copyright (c) 2007-2015 the FFmpeg developers
   built with gcc 4.9.3 (Debian 4.9.3-3)
   configuration: --enable-gpl --enable-version3 --disable-shared
 --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-
 libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-
 libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig
 --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-
 gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls
 --enable-libvidstab --enable-libsoxr --cc=gcc-4.9
   libavutil      54. 29.100 / 54. 29.100
   libavcodec     56. 56.101 / 56. 56.101
   libavformat    56. 40.101 / 56. 40.101
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 30.100 /  5. 30.100
   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 'ffmpeg_aac_128k.m4a':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2mp41
     title           : For Amelie [New Version - Bonus Track]
     artist          : Leaves' Eyes
     album           : Vinland Saga
     date            : 2005
     encoder         : Lavf57.27.100
     genre           : Symphonic Gothic Metal
     track           : 14/14
   Duration: 00:00:09.47, start: 0.023220, bitrate: 129 kb/s
     Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
 stereo, fltp, 127 kb/s (default)
     Metadata:
       handler_name    : SoundHandler

 # ffprobe version N-48618-g9ec17e4-static http://johnvansickle.com/ffmpeg/
 Copyright (c) 2007-2015 the FFmpeg developers
   built with gcc 4.9.3 (Debian 4.9.3-3)
   configuration: --enable-gpl --enable-version3 --disable-shared
 --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-
 libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-
 libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig
 --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-
 gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls
 --enable-libvidstab --enable-libsoxr --cc=gcc-4.9
   libavutil      54. 29.100 / 54. 29.100
   libavcodec     56. 56.101 / 56. 56.101
   libavformat    56. 40.101 / 56. 40.101
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 30.100 /  5. 30.100
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  2.101 /  1.  2.101
   libpostproc    53.  3.100 / 53.  3.100
 Input #0, wav, from '1.wav':
   Metadata:
     artist          : Leaves' Eyes
     date            : 2005
     genre           : Symphonic Gothic Metal
     title           : For Amelie [New Version - Bonus Track]
     album           : Vinland Saga
     track           : 14/14
     encoder         : Lavf57.27.101
   Duration: 00:00:09.47, bitrate: 1411 kb/s
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2
 channels, s16, 1411 kb/s

 }}}


 {{{
 # ffmpeg -version
 ffmpeg version N-53341-gbd9c587-static http://johnvansickle.com/ffmpeg/
 Copyright (c) 2000-2016 the FFmpeg developers
 built with gcc 5.3.1 (Debian 5.3.1-10) 20160224
 configuration: --enable-gpl --enable-version3 --disable-shared --disable-
 debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264
 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis
 --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid
 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora
 --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-
 libopus --enable-libass --enable-gnutls --enable-libvidstab --enable-
 libsoxr --enable-frei0r --enable-libfribidi --disable-indev=sndio
 --disable-outdev=sndio --enable-librtmp --enable-libmfx --cc=gcc
 libavutil      55. 19.100 / 55. 19.100
 libavcodec     57. 27.101 / 57. 27.101
 libavformat    57. 27.101 / 57. 27.101
 libavdevice    57.  0.101 / 57.  0.101
 libavfilter     6. 38.100 /  6. 38.100
 libswscale      4.  0.100 /  4.  0.100
 libswresample   2.  0.101 /  2.  0.101
 libpostproc    54.  0.100 / 54.  0.100
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5290>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


More information about the FFmpeg-trac mailing list