[FFmpeg-trac] #5498(undetermined:new): Pentax K-r MJPEG files - one second clicking

FFmpeg trac at avcodec.org
Sun May 1 23:14:29 CEST 2016

#5498: Pentax K-r MJPEG files - one second clicking
             Reporter:  wanted       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  pentax k-r   |               Blocked By:
  interleave audio clicking          |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
 Summary of the bug:
 Files produced by Pentax K-r camera are not fully supported by ffmpeg.
 There is an issue with audio, where one can hear a distinct click every
 second, both when using ffplay and in output files converted with ffmpeg.
 I read on some forum this might be related to the way audio from AVI files
 from this camera is interleaved with video, i.e. with 1 second period,
 which is unusual.

 Many tools, like video converters, based on ffmpeg also exhibit this
 behavior. My workaround has always been to use avidemux, which works fine
 with those AVI files, but it would be nice to fix that also for ffmpeg.

 How to reproduce:
 % ffplay <file>

 ffmpeg version 2.8.6-1ubuntu2 Copyright (c) 2000-2016 the FFmpeg
   built with gcc 5.3.1 (Ubuntu 5.3.1-11ubuntu1) 20160311
   configuration: --prefix=/usr --extra-version=1ubuntu2 --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

 Example file:

 mediainfo output on the example file, notice audio interleave of 1 second.
 Format                                   : AVI
 Format/Info                              : Audio Video Interleave
 File size                                : 24.3 MiB
 Duration                                 : 8s 0ms
 Overall bit rate                         : 25.5 Mbps
 Mastered date                            : 2012/05/27 16:11:38
 Writing application                      : PENTAX K-r

 ID                                       : 0
 Format                                   : JPEG
 Codec ID                                 : MJPG
 Duration                                 : 8s 0ms
 Bit rate                                 : 24.9 Mbps
 Width                                    : 1 280 pixels
 Height                                   : 720 pixels
 Display aspect ratio                     : 16:9
 Frame rate                               : 25.000 fps
 Color space                              : YUV
 Chroma subsampling                       : 4:2:0
 Bit depth                                : 8 bits
 Compression mode                         : Lossy
 Bits/(Pixel*Frame)                       : 1.082
 Stream size                              : 23.8 MiB (98%)

 ID                                       : 1
 Format                                   : PCM
 Format settings, Endianness              : Little
 Format settings, Sign                    : Signed
 Codec ID                                 : 1
 Duration                                 : 8s 0ms
 Bit rate mode                            : Constant
 Bit rate                                 : 512 Kbps
 Channel(s)                               : 1 channel
 Sampling rate                            : 32.0 KHz
 Bit depth                                : 16 bits
 Stream size                              : 500 KiB (2%)
 Alignment                                : Aligned on interleaves
 Interleave, duration                     : 1000 ms (25.00 video frames)
 Interleave, preload duration             : 1000 ms

Ticket URL: <https://trac.ffmpeg.org/ticket/5498>
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