Opened 2 years ago

Last modified 2 years ago

#5514 open defect

Interlaced HEVC Steam not Decoded Properly

Reported by: jlsantiago0 Owned by:
Priority: normal Component: avcodec
Version: git-master Keywords: hevc
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no


Summary of the bug:

I have a 480i interlaced HEVC elementary stream. The HM reference decoder decodes the stream and generates 720x480 interlaced frames. FFMPEG/FFPLAY decodes the stream and 720x240 progressive frames and FFPLAY plays them at half the frame rate with the first/second field/frames bouncing up and down a line because these are actually 2 different fields of the same frame.

How to reproduce:

ffmpeg -i src13_interlaced.265 src13_interaced.yuv
ffplay src13_interlaced.265

$ ffmpeg -i src13_interlaced.265 src13_interaced.yuv
ffmpeg version git-2016-04-27-7bccbee-VF Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)
  configuration: --extra-version=VF --prefix=/mnt/kermit/work/git/ort/build/linux64/stage/ffmpeg --ld=/usr/bin/cc --target-os=linux --arch=x86_64 --cpu=x86_64 --enable-pic --enable-static --enable-shared --enable-rpath --enable-avfilter --enable-pthreads --enable-zlib --enable-bzlib --enable-runtime-cpudetect --enable-hardcoded-tables --disable-stripping --disable-doc --disable-dxva2 --disable-vaapi --disable-vda --disable-vdpau --yasmexe=/mnt/kermit/work/git/ort/build/linux64/tools/yasm/bin/yasm --sdl-config=/mnt/kermit/work/git/ort/build/linux64/stage/sdl/lib/../bin/sdl-config --extra-cflags='-I/mnt/kermit/work/git/ort/build/linux64/stage/zlib/include -I/mnt/kermit/work/git/ort/build/linux64/stage/bzip2/include -I/mnt/kermit/work/git/ort/build/linux64/stage/lzma/include -I/mnt/kermit/work/git/ort/build/linux64/stage/sdl/include -DVFBUILD_DISABLE_INTMATH_OPTIMIZATIONS=1' --extra-ldflags='-L/mnt/kermit/work/git/ort/build/linux64/stage/zlib/lib -L/mnt/kermit/work/git/ort/build/linux64/stage/bzip2/lib -L/mnt/kermit/work/git/ort/build/linux64/stage/lzma/lib -L/mnt/kermit/work/git/ort/build/linux64/stage/sdl/lib'
  libavutil      55. 19.100 / 55. 19.100
  libavcodec     57. 28.203 / 57. 28.203
  libavformat    57. 29.200 / 57. 29.200
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 39.202 /  6. 39.202
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
VFAVUtil_MetaData_RunUnitTests() Completed Successfully.
Input #0, hevc, from 'src13_interlaced.265':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: hevc (Main), yuv420p(tv), 720x240, 30 fps, 30 tbr, 1200k tbn, 30 tbc
Output #0, rawvideo, to 'src13_interaced.yuv':
    encoder         : Lavf57.29.200
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x240, q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc
      encoder         : Lavc57.28.203 rawvideo
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
frame=  336 fps=0.0 q=-0.0 size=   85050kB time=00:00:11.20 bitrate=62208.0kbitsframe=  337 fps=263 q=-0.0 size=   85303kB time=00:00:11.23 bitrate=62208.0kbitsframe=  522 fps=337 q=-0.0 Lsize=  132131kB time=00:00:17.40 bitrate=62208.0kbits/s speed=11.2x    
video:132131kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%

Attachments (2)

hm_reference_decoder_test.txt (43.6 KB) - added by jlsantiago0 2 years ago.
HM Reference Decoder Test Run
src13_interlaced_cut.265 (2.4 MB) - added by cehoyos 2 years ago.

Change History (7)

comment:1 Changed 2 years ago by jamrial

Can you attach or upload the sample somewhere? Not much we can do otherwise

comment:2 Changed 2 years ago by jlsantiago0

The files are too large to upload to the ticket. 2.5MB limit. I have provided the following files for external download:

HEVC Elementary Stream:

Does not Play correctly with:
   ffplay src13_interlaced.265

FFMPEG Decoder Output:

Does not Play correctly with:
   ffplay -f rawvideo -pix_fmt yuv420p -framerate 30 -s 720x480 -i src13_ffmpeg.yuv
Better but half framerate and field bounce and incorrect resolution with:
   ffplay -f rawvideo -pix_fmt yuv420p -framerate 30 -s 720x240 -i src13_ffmpeg.yuv

HM Reference Decoder Output:

Plays correctly with:
   ffplay -f rawvideo -pix_fmt yuv420p -framerate 30 -s 720x480 -i src13_hm.yuv
Last edited 2 years ago by jlsantiago0 (previous) (diff)

Changed 2 years ago by jlsantiago0

HM Reference Decoder Test Run

comment:3 Changed 2 years ago by heleppkes

Duplicate of ticket #4141

comment:4 Changed 2 years ago by dhelsley

There are differences. In #4141, according to the comments the stream in question has field_seq_flag=1 but pic_struct=3, which is improper syntax, and the reference decoder does the same thing as FFMPEG (output half-height frames).

With this particular elementary stream, field_seq_flag=1 and pic_struct=1 or 2 depending on which field it is, which is valid interlaced syntax. The reference decoder produces proper interlaced output frames with this test vector.

Last edited 2 years ago by dhelsley (previous) (diff)

comment:5 Changed 2 years ago by cehoyos

  • Keywords hevc added
  • Reproduced by developer set
  • Status changed from new to open

Changed 2 years ago by cehoyos

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