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• What is the difference between "location" and "location-eng" metadata of a MP4 file ?

  10 décembre 2020, par Weihang Jian

  I am trying to retrieve GPS information from media files using ffprobe, for example :

  


  $ ffprobe -v quiet -show_format sample.mp4
[FORMAT]
filename=sample.mp4
nb_streams=2
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=4.293000
size=11888152
bit_rate=22153556
probe_score=100
TAG:major_brand=mp42
TAG:minor_version=0
TAG:compatible_brands=isommp42
TAG:creation_time=2020-09-20T11:33:49.000000Z
TAG:location=+25.0731+121.3663/
TAG:location-eng=+25.0731+121.3663/
TAG:com.android.version=10
TAG:com.android.manufacturer=Google
TAG:com.android.model=Pixel
[/FORMAT]


  


  We can see that there are 2 tags that look like ISO6709 representations, location and location-eng.

  


  And here are my questions :

  


  

  1. What is the difference between location and location-eng ? It looks like they are always the same. Why do we need 2 different keys with same the value ?

  


  2. Are location and location-eng really in ISO6709 representations ? Is there any specification or standard I can refer to ?

  


  


  I would really appreciate your help.

  


• Revert "avformat/rtp : Pass sources and block filter addresses via sdp file for rtp"

  5 avril 2020, par Carl Eugen Hoyos

  Revert "avformat/rtp : Pass sources and block filter addresses via sdp file for rtp"
  This reverts commit b71685865fe761925feedda3cd0b288224d9a509.
  The commit lead to the use of an uninitialized variable.
  
  Other issues were listed by Andreas Rheinhardt :
  
  https://ffmpeg.org/pipermail/ffmpeg-devel/2020-March/259150.html
  

  • [DH] libavformat/rtsp.c

• Why console reports a lot of frame drops on my conversion ?

  24 juin 2020, par Sososlik

  I'm trying to convert a mp4 video file to another H265 mp4 video file. During conversion I'm applying crop, trim and a drawbox.

  
The result file looks good to the eye. But the question is why I see a lot of dropped frames on the console during conversion process ? (last line on the log, parameter "drop=").

  
I searched google, but it says that normal if you do framerate conversion, but I'm not doing that and don't want any framerate change, just apply my filters and convert to H265. What I'm doing wrong ?

  


  D:\folder>ffmpeg -y -i "D:\folder\input.mp4" -c:v libx265 -crf 10 -c:a none -vf "drawbox=x=123:y=123:w=123:h=123:color=black:t=fill, crop=616:1192:52:4" -ss 00:06:53.00 -to 00:12:46.00 "D:\folder\output.mp4"
ffmpeg version N-92683-g32601fb821 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 8.2.1 (GCC) 20181201
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 24.101 / 56. 24.101
  libavcodec     58. 42.100 / 58. 42.100
  libavformat    58. 24.100 / 58. 24.100
  libavdevice    58.  6.101 / 58.  6.101
  libavfilter     7. 46.101 /  7. 46.101
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\folder\input.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2020-03-03T07:49:33.000000Z
    com.android.version: 9
    com.android.capture.fps: 25.000000
  Duration: 00:26:59.81, start: 0.000000, bitrate: 9590 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x1280, 9587 kb/s, SAR 1:1 DAR 9:16, 30.80 fps, 90k tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2020-03-03T07:49:33.000000Z
      handler_name    : VideoHandle
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265))
Press [q] to stop, [?] for help
x265 [info]: HEVC encoder version 2.9+9-f74003e88622
x265 [info]: build info [Windows][GCC 8.2.1][64 bit] 8bit+10bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
x265 [info]: Main profile, Level-3.1 (Main tier)
x265 [info]: Thread pool created using 4 threads
x265 [info]: Slices                              : 1
x265 [info]: frame threads / pool features       : 2 / wpp(19 rows)
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 2
x265 [info]: Keyframe min / max / scenecut / bias: 25 / 250 / 40 / 5.00
x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
x265 [info]: References / ref-limit  cu / depth  : 3 / on / on
x265 [info]: AQ: mode / str / qg-size / cu-tree  : 1 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress            : CRF-10.0 / 0.60
x265 [info]: tools: rd=3 psy-rd=2.00 rskip signhide tmvp strong-intra-smoothing
x265 [info]: tools: lslices=7 deblock sao
Output #0, mp4, to 'D:\folder\output.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    com.android.capture.fps: 25.000000
    com.android.version: 9
    encoder         : Lavf58.24.100
    Stream #0:0(eng): Video: hevc (libx265) (hev1 / 0x31766568), yuv420p, 616x1192 [SAR 1:1 DAR 77:149], q=2-31, 30.80 fps, 512845807.00 tbn, 30.80 tbc (default)
    Metadata:
      creation_time   : 2020-03-03T07:49:33.000000Z
      handler_name    : VideoHandle
      encoder         : Lavc58.42.100 libx265
frame= 9053 fps=4.7 q=-0.0 size=  119040kB time=00:04:52.93 bitrate=3329.0kbits/s dup=9 drop=1188 speed=0.151x