[FFmpeg-trac] #5450(ffmpeg:new): MPEG2 -ss X with -frames:v 1 result in duplicate images

[FFmpeg]

#5450: MPEG2 -ss X with -frames:v 1 result in duplicate images
-------------------------------------+-------------------------------------
             Reporter:  kolpax       |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:  ffmpeg       |                  Version:
             Keywords:  frames:v,    |  unspecified
  -ss, MPEG2, MXF                    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 I noticed that when exporting specific frames from a mpeg2video files, I
 get the same frame multiple times even though I specify different seeks.
 Only after exporting about a second worth of frames do I get a new image.

 How to reproduce:
 {{{
 % ffmpeg -ss 7.000 -i input.mov -frames:v 1 output-1.jpeg
 % ffmpeg -ss 7.040 -i input.mov -frames:v 1 output-2.jpeg
 % ffmpeg -ss 7.080 -i input.mov -frames:v 1 output-3.jpeg
 }}}

 Output when rendering:
 {{{
 ffmpeg version 3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
   built with Apple LLVM version 7.3.0 (clang-703.0.29)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.1 --enable-shared
 --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables
 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-
 opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-
 libsnappy --enable-libfontconfig --enable-libfreetype --enable-libtheora
 --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libopencore-
 amrnb --enable-libopencore-amrwb --enable-libfaac --enable-libass
 --enable-ffplay --enable-libssh --enable-libspeex --enable-libschroedinger
 --enable-libfdk-aac --enable-openssl --enable-libopus --enable-frei0r
 --enable-libvidstab --enable-libx265 --enable-libwebp --enable-libzmq
 --enable-libdcadec --enable-librubberband --enable-libzimg --enable-
 libopenh264 --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-
 cflags=-I/usr/local/Cellar/openjpeg/1.5.2_1/include/openjpeg-1.5 --enable-
 nonfree --enable-vda
   libavutil      55. 17.103 / 55. 17.103
   libavcodec     57. 24.102 / 57. 24.102
   libavformat    57. 25.100 / 57. 25.100
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 31.100 /  6. 31.100
   libavresample   3.  0.  0 /  3.  0.  0
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 [mxf @ 0x7fb5b2000800] broken or empty index
 [mxf @ 0x7fb5b2000800] Estimating duration from bitrate, this may be
 inaccurate
 Guessed Channel Layout for  Input Stream #0.1 : 7.1
 Input #0, mxf, from '/Users/kolpax/input.mxf':
   Metadata:
     uid             : adab4424-2f25-4dc7-92ff-29bd000c0000
     generation_uid  : adab4424-2f25-4dc7-92ff-29bd000c0001
     company_name    : FFmpeg
     product_name    : OP1a Muxer
     product_version : 56.40.101
     product_uid     : adab4424-2f25-4dc7-92ff-29bd000c0002
     modification_date: 0000-01-01 00:00:00
     material_package_umid:
 0x060A2B340101010501010D00137EC7E9529471341F7EC7E900529471341F7E00
     timecode        : 13:16:19:19
   Duration: 00:00:33.38, start: 0.000000, bitrate: 59217 kb/s
     Stream #0:0: Video: mpeg2video (4:2:2), yuv422p(tv, bt709), 1920x1080
 [SAR 1:1 DAR 16:9], 50000 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
     Metadata:
       file_package_umid:
 0x060A2B340101010501010D00137EC7E9529471341F7EC7E900529471341F7E01
     Stream #0:1: Audio: pcm_s24le, 48000 Hz, 8 channels, s32 (24 bit),
 9216 kb/s
     Metadata:
       file_package_umid:
 0x060A2B340101010501010D00137EC7E9529471341F7EC7E900529471341F7E01
 [swscaler @ 0x7fb5b3000600] deprecated pixel format used, make sure you
 did set range correctly
 Output #0, image2, to 'output-1.jpeg':
   Metadata:
     uid             : adab4424-2f25-4dc7-92ff-29bd000c0000
     generation_uid  : adab4424-2f25-4dc7-92ff-29bd000c0001
     company_name    : FFmpeg
     product_name    : OP1a Muxer
     product_version : 56.40.101
     product_uid     : adab4424-2f25-4dc7-92ff-29bd000c0002
     modification_date: 0000-01-01 00:00:00
     material_package_umid:
 0x060A2B340101010501010D00137EC7E9529471341F7EC7E900529471341F7E00
     timecode        : 13:16:19:19
     encoder         : Lavf57.25.100
     Stream #0:0: Video: mjpeg, yuvj422p(pc), 1920x1080 [SAR 1:1 DAR 16:9],
 q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       file_package_umid:
 0x060A2B340101010501010D00137EC7E9529471341F7EC7E900529471341F7E01
       encoder         : Lavc57.24.102 mjpeg
     Side data:
       unknown side data type 10 (24 bytes)
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg2video (native) -> mjpeg (native))
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=9.1 Lsize=N/A time=00:00:00.04 bitrate=N/A dup=1
 drop=1 speed=0.955x
 video:128kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5450>
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