[FFmpeg-trac] #2696(undetermined:new): Audio/Video sync issues when reducing fps from 59.94 to 29.97

FFmpeg trac at avcodec.org
Sun Jun 23 20:42:37 CEST 2013


#2696: Audio/Video sync issues when reducing fps from 59.94 to 29.97
-------------------------------------+-------------------------------------
             Reporter:  smblr75      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by smblr75):

 Thanks for the quick reply. I took the latest ffmpeg and x264 from the
 version control and rebuilt ffmpeg. I still see the same lip sync issue.
 Uploaded the file at http://www.datafilehost.com/download-cacda369.html

 {{{
 ffmpeg -i dejavu_orig.mp4 -r 29.97 -s 848x476 -g 15 ff_2997_gop_15.mp4
 ffmpeg version N-54152-g730e07f Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jun 23 2013 13:27:07 with gcc 4.4.6 (GCC) 20120305 (Red Hat
 4.4.6-4)
   configuration: --enable-gpl --enable-version3 --enable-zlib --enable-
 bzlib --enable-pthreads --enable-libvorbis --enable-libtheora --enable-
 libspeex --enable-libmp3lame --enable-libxvid --enable-libx264 --enable-
 libopencore_amrwb --enable-libopencore_amrnb --enable-libfdk_aac --enable-
 libvpx --enable-libgsm --enable-nonfree --enable-shared --enable-static
   libavutil      52. 37.101 / 52. 37.101
   libavcodec     55. 16.100 / 55. 16.100
   libavformat    55.  9.100 / 55.  9.100
   libavdevice    55.  2.100 / 55.  2.100
   libavfilter     3. 77.101 /  3. 77.101
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'dejavu_orig.mp4':
   Metadata:
     major_brand     : qt
     minor_version   : 537199360
     compatible_brands: qt
     creation_time   : 2013-06-10 21:03:17
   Duration: 00:02:41.34, start: 0.000000, bitrate: 10227 kb/s
     Stream #0:0(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz,
 stereo, s16, 1536 kb/s
     Metadata:
       creation_time   : 2013-06-10 21:10:02
       handler_name    : Apple Alias Data Handler
     Stream #0:1(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p,
 1280x720, 8684 kb/s, 59.94 fps, 59.94 tbr, 5994 tbn, 11988 tbc
     Metadata:
       creation_time   : 2013-06-10 21:10:02
       handler_name    : Apple Alias Data Handler
 [libx264 @ 0x12ab400] using cpu capabilities: MMX2 SSE Cache64 BMI1
 [libx264 @ 0x12ab400] profile High, level 3.1
 [libx264 @ 0x12ab400] 264 - core 133 r2334M a3ac64b - H.264/MPEG-4 AVC
 codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options:
 cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1
 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1
 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6
 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0
 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=15 keyint_min=1
 scenecut=40 intra_refresh=0 rc_lookahead=15 rc=crf mbtree=1 crf=23.0
 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
 Output #0, mp4, to 'ff_2997_gop_15.mp4':
   Metadata:
     major_brand     : qt
     minor_version   : 537199360
     compatible_brands: qt
     encoder         : Lavf55.9.100
     Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021),
 yuv420p, 848x476, q=-1--1, 11988 tbn, 29.97 tbc
     Metadata:
       creation_time   : 2013-06-10 21:10:02
       handler_name    : Apple Alias Data Handler
     Stream #0:1(eng): Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040),
 48000 Hz, stereo, s16, 139 kb/s
     Metadata:
       creation_time   : 2013-06-10 21:10:02
       handler_name    : Apple Alias Data Handler
 Stream mapping:
   Stream #0:1 -> #0:0 (h264 -> libx264)
   Stream #0:0 -> #0:1 (pcm_s16le -> libfdk_aac)
 Press [q] to stop, [?] for help
 frame= 4838 fps= 42 q=-1.0 Lsize=   23685kB time=00:02:41.36
 bitrate=1202.4kbits/s dup=0 drop=4833
 video:20764kB audio:2751kB subtitle:0 global headers:0kB muxing overhead
 0.725098%
 [libx264 @ 0x12ab400] frame I:331   Avg QP:19.79  size: 42081
 [libx264 @ 0x12ab400] frame P:1844  Avg QP:24.27  size:  3090
 [libx264 @ 0x12ab400] frame B:2663  Avg QP:26.69  size:   614
 [libx264 @ 0x12ab400] consecutive B-frames: 22.1% 10.9%  7.5% 59.4%
 [libx264 @ 0x12ab400] mb I  I16..4: 12.1% 53.8% 34.1%
 [libx264 @ 0x12ab400] mb P  I16..4:  1.8%  3.1%  1.0%  P16..4: 19.5%  5.4%
 3.4%  0.0%  0.0%    skip:65.8%
 [libx264 @ 0x12ab400] mb B  I16..4:  0.1%  0.0%  0.0%  B16..8: 20.4%  1.1%
 0.2%  direct: 0.3%  skip:77.9%  L0:42.7% L1:53.7% BI: 3.7%
 [libx264 @ 0x12ab400] 8x8 transform intra:53.2% inter:76.5%
 [libx264 @ 0x12ab400] coded y,uvDC,uvAC intra: 71.1% 47.7% 29.2% inter:
 4.1% 4.7% 0.4%
 [libx264 @ 0x12ab400] i16 v,h,dc,p: 29% 39%  4% 28%
 [libx264 @ 0x12ab400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 12% 25%  8%  9%
 7% 10%  6%  6%
 [libx264 @ 0x12ab400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 23% 12%  5%  8%
 7%  8%  5%  5%
 [libx264 @ 0x12ab400] i8c dc,h,v,p: 61% 18% 17%  4%
 [libx264 @ 0x12ab400] Weighted P-Frames: Y:1.6% UV:1.2%
 [libx264 @ 0x12ab400] ref P L0: 68.4% 11.2% 13.2%  7.1%  0.0%
 [libx264 @ 0x12ab400] ref B L0: 81.2% 14.6%  4.3%
 [libx264 @ 0x12ab400] ref B L1: 92.6%  7.4%
 [libx264 @ 0x12ab400] kb/s:1053.66

 }}}


 Note: I also increased IFrame rate to 1 every 1/2 second (to match the
 source video).

 Also tried mpeg4 instead of h264 as recommended but still see the same
 issue. Uploaded at http://www.datafilehost.com/download-81b0bed0.html

 {{{
 ffmpeg -i dejavu_orig.mp4 -r 29.97 -s 848x476 -g 15 -vcodec mpeg4 -acodec
 aac -strict -2 -b:v 1500k  mpeg4_2997_gop_15.mp4
 ffmpeg version N-54152-g730e07f Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jun 23 2013 13:27:07 with gcc 4.4.6 (GCC) 20120305 (Red Hat
 4.4.6-4)
   configuration: --enable-gpl --enable-version3 --enable-zlib --enable-
 bzlib --enable-pthreads --enable-libvorbis --enable-libtheora --enable-
 libspeex --enable-libmp3lame --enable-libxvid --enable-libx264 --enable-
 libopencore_amrwb --enable-libopencore_amrnb --enable-libfdk_aac --enable-
 libvpx --enable-libgsm --enable-nonfree --enable-shared --enable-static
   libavutil      52. 37.101 / 52. 37.101
   libavcodec     55. 16.100 / 55. 16.100
   libavformat    55.  9.100 / 55.  9.100
   libavdevice    55.  2.100 / 55.  2.100
   libavfilter     3. 77.101 /  3. 77.101
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'dejavu_orig.mp4':
   Metadata:
     major_brand     : qt
     minor_version   : 537199360
     compatible_brands: qt
     creation_time   : 2013-06-10 21:03:17
   Duration: 00:02:41.34, start: 0.000000, bitrate: 10227 kb/s
     Stream #0:0(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz,
 stereo, s16, 1536 kb/s
     Metadata:
       creation_time   : 2013-06-10 21:10:02
       handler_name    : Apple Alias Data Handler
     Stream #0:1(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p,
 1280x720, 8684 kb/s, 59.94 fps, 59.94 tbr, 5994 tbn, 11988 tbc
     Metadata:
       creation_time   : 2013-06-10 21:10:02
       handler_name    : Apple Alias Data Handler
 File 'mpeg4_2997_gop_15.mp4' already exists. Overwrite ? [y/N] y
 Output #0, mp4, to 'mpeg4_2997_gop_15.mp4':
   Metadata:
     major_brand     : qt
     minor_version   : 537199360
     compatible_brands: qt
     encoder         : Lavf55.9.100
     Stream #0:0(eng): Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p,
 848x476, q=2-31, 1500 kb/s, 11988 tbn, 29.97 tbc
     Metadata:
       creation_time   : 2013-06-10 21:10:02
       handler_name    : Apple Alias Data Handler
     Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz,
 stereo, fltp, 128 kb/s
     Metadata:
       creation_time   : 2013-06-10 21:10:02
       handler_name    : Apple Alias Data Handler
 Stream mapping:
   Stream #0:1 -> #0:0 (h264 -> mpeg4)
   Stream #0:0 -> #0:1 (pcm_s16le -> aac)
 Press [q] to stop, [?] for help
 frame= 4838 fps= 42 q=2.0 Lsize=   32180kB time=00:02:41.42
 bitrate=1633.0kbits/s dup=0 drop=4833
 video:29510kB audio:2532kB subtitle:0 global headers:0kB muxing overhead
 0.431357%
 }}}

 I will try to get rhozet EULA for you.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2696#comment:6>
FFmpeg <http://ffmpeg.org>
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