Recherche avancée

Sur d’autres sites (13297)

• Youtube DASH stream through to iOS format

  29 juillet 2014, par viperfx

  I have a stream link of a DASH codec format audio file using youtube-dl. It plays fine in the browser but on iOS the DASH codec is not supported. I am wondering how I can use ffmpeg to transcode the HTTPS stream live and then resend it out an AAC encoded m4a file or something that the iOS SDK supports through streaming - mp3 also works. I think using something such as nginx as the middleware inbetween would be a good idea. I can use python app to receive the request /videoID, it would grab the stream link and transcode it live feed it to nginx which would serve the correctly transcoded format back to the iOS app.

  Does anyone have any suggestions/ideas on how to achieve this ? I am stuck on the details on the ffmpeg bit.

• ffmpeg rotate and resize

  23 août 2014, par user1321964

  I’m trying to resize a movie and to rotate it counter-clockwise using ffmpeg.
  I can achieve one or the other ok individually

  ffmpeg -i MVI_8189.MOV -vf "transpose=2" -ss 00:00:12 -t 00:00:05 rotate.MOV

  OR

  ffmpeg -i MVI_8189.MOV -s 720x406 -ss 00:00:12 -t 00:00:05 resize.MOV

  but if I try to do both, either-

  ffmpeg -i MVI_8189.MOV -s 720x406 -ss 00:00:12 -t 00:00:05 resize.MOV

  ffmpeg -i resize.MOV -vf "transpose=2" toutp.MOV

  OR

  ffmpeg -i MVI_8189.MOV -vf "transpose=2" -ss 00:00:12 -t 00:00:05 rotate.MOV

  ffmpeg -i rotate.MOV -s 406x720 toutp.MOV

  the final movie does not play, only audio, no video ; neither previewing in Finder, nor in Quicktime. More seriously once I have attempted to play it, I can’t then play any other movie whatsoever (only audio) - quicktime won’t quit, constantly need to force-quit it. The only way to then restore seems to be reboot OS-X

  This though does work -

  ffmpeg -i MVI_8189.MOV -vf "transpose=2" -ss 00:00:12 -t 00:00:05 rotate.MOV

  ffmpeg -i rotate.MOV -s 720x406 toutp.MOV

  but doesn’t do what I want - it stretches the movie in the wrong direction

  Any ideas ?

  ffmpeg version 1.0.git Copyright (c) 2000-2012 the FFmpeg developers
  built on Dec 24 2012 18:43:25 with llvm-gcc 4.2.1 (LLVM build 2336.1.00)

  MAC OSX 10.7.5

  ==========
  output from

  ffmpeg -i MVI_8189.MOV -vf "transpose=2" -ss 00:00:12 -t 00:00:05 rotate.MOV
  
  ffmpeg -i rotate.MOV -s 406x720  toutp.MOV
  
  
  
  
  
  
  
  ffmpeg version 1.0.git Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Dec 24 2012 18:43:25 with llvm-gcc 4.2.1 (LLVM build 2336.1.00)
  
    configuration: --prefix=/usr/local --enable-shared --disable-mmx --enable-libmp3lame --enable-gpl --enable-zlib --enable-libvorbis --enable-libfaac --enable-nonfree --enable-libx264 --enable-pthreads
  
    libavutil      52. 12.100 / 52. 12.100
  
    libavcodec     54. 81.100 / 54. 81.100
  
    libavformat    54. 49.102 / 54. 49.102
  
    libavdevice    54.  3.102 / 54.  3.102
  
    libavfilter     3. 29.101 /  3. 29.101
  
    libswscale      2.  1.103 /  2.  1.103
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MVI_8189.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537331968
  
      compatible_brands: qt  CAEP
  
      creation_time   : 2014-08-17 23:13:43
  
    Duration: 00:01:32.40, start: 0.000000, bitrate: 44677 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuvj420p, 1920x1080, 43132 kb/s, 25 fps, 25 tbr, 25k tbn, 50k tbc
  
      Metadata:
  
        creation_time   : 2014-08-17 23:13:43
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s
  
      Metadata:
  
        creation_time   : 2014-08-17 23:13:43
  
  [libx264 @ 0x7fc67c043600] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
  
  [libx264 @ 0x7fc67c043600] profile High, level 4.0
  
  [libx264 @ 0x7fc67c043600] 264 - core 128 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - 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=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 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, mov, to 'rotate.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537331968
  
      compatible_brands: qt  CAEP
  
      encoder         : Lavf54.49.102
  
      Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuvj420p, 1080x1920, q=-1--1, 12800 tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 2014-08-17 23:13:43
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        creation_time   : 2014-08-17 23:13:43
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (pcm_s16le -> libfaac)
  
  Press [q] to stop, [?] for help
  
  frame=  125 fps=5.7 q=-2.0 Lsize=    6394kB time=00:00:05.00 bitrate=10470.5kbits/s    /s    
  
  video:6322kB audio:67kB subtitle:0 global headers:0kB muxing overhead 0.079207%
  
  [libx264 @ 0x7fc67c043600] frame I:1     Avg QP:25.87  size:113032
  
  [libx264 @ 0x7fc67c043600] frame P:65    Avg QP:25.78  size: 64251
  
  [libx264 @ 0x7fc67c043600] frame B:59    Avg QP:26.73  size: 37017
  
  [libx264 @ 0x7fc67c043600] consecutive B-frames:  5.6% 94.4%  0.0%  0.0%
  
  [libx264 @ 0x7fc67c043600] mb I  I16..4: 10.7% 79.9%  9.3%
  
  [libx264 @ 0x7fc67c043600] mb P  I16..4:  3.6% 12.0%  0.3%  P16..4: 52.0% 19.1% 11.3%  0.0%  0.0%    skip: 1.7%
  
  [libx264 @ 0x7fc67c043600] mb B  I16..4:  0.9%  1.7%  0.0%  B16..8: 45.4%  5.1%  0.8%  direct:24.2%  skip:21.9%  L0:50.1% L1:44.5% BI: 5.3%
  
  [libx264 @ 0x7fc67c043600] 8x8 transform intra:74.5% inter:79.5%
  
  [libx264 @ 0x7fc67c043600] coded y,uvDC,uvAC intra: 59.4% 94.3% 79.5% inter: 38.2% 80.5% 30.1%
  
  [libx264 @ 0x7fc67c043600] i16 v,h,dc,p: 30% 21% 22% 28%
  
  [libx264 @ 0x7fc67c043600] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 14% 24%  6%  8%  9%  7%  8%  7%
  
  [libx264 @ 0x7fc67c043600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 18% 17%  6%  7%  8%  6%  6%  4%
  
  [libx264 @ 0x7fc67c043600] i8c dc,h,v,p: 60% 14% 18%  8%
  
  [libx264 @ 0x7fc67c043600] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7fc67c043600] ref P L0: 43.9% 12.6% 26.8% 16.7%
  
  [libx264 @ 0x7fc67c043600] ref B L0: 68.6% 31.4%
  
  [libx264 @ 0x7fc67c043600] kb/s:10357.28
  
  ffmpeg version 1.0.git Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Dec 24 2012 18:43:25 with llvm-gcc 4.2.1 (LLVM build 2336.1.00)
  
    configuration: --prefix=/usr/local --enable-shared --disable-mmx --enable-libmp3lame --enable-gpl --enable-zlib --enable-libvorbis --enable-libfaac --enable-nonfree --enable-libx264 --enable-pthreads
  
    libavutil      52. 12.100 / 52. 12.100
  
    libavcodec     54. 81.100 / 54. 81.100
  
    libavformat    54. 49.102 / 54. 49.102
  
    libavdevice    54.  3.102 / 54.  3.102
  
    libavfilter     3. 29.101 /  3. 29.101
  
    libswscale      2.  1.103 /  2.  1.103
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'rotate.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      encoder         : Lavf54.49.102
  
    Duration: 00:00:05.01, start: 0.010667, bitrate: 10446 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p, 1080x1920, 10358 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
      Metadata:
  
        handler_name    : DataHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 109 kb/s
  
      Metadata:
  
        handler_name    : DataHandler
  
  [libx264 @ 0x7fcf1c05ba00] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
  
  [libx264 @ 0x7fcf1c05ba00] profile High, level 3.0
  
  [libx264 @ 0x7fcf1c05ba00] 264 - core 128 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - 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=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 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, mov, to 'toutp.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      encoder         : Lavf54.49.102
  
      Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuvj420p, 406x720, q=-1--1, 12800 tbn, 25 tbc
  
      Metadata:
  
        handler_name    : DataHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        handler_name    : DataHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> libfaac)
  
  Press [q] to stop, [?] for help
  
  frame=  125 fps= 32 q=-2.0 Lsize=     469kB time=00:00:05.01 bitrate= 766.2kbits/s    
  
  video:396kB audio:68kB subtitle:0 global headers:0kB muxing overhead 1.088481%
  
  [libx264 @ 0x7fcf1c05ba00] frame I:1     Avg QP:24.20  size: 31395
  
  [libx264 @ 0x7fcf1c05ba00] frame P:42    Avg QP:24.51  size:  7137
  
  [libx264 @ 0x7fcf1c05ba00] frame B:82    Avg QP:27.71  size:   893
  
  [libx264 @ 0x7fcf1c05ba00] consecutive B-frames:  0.8% 16.0% 57.6% 25.6%
  
  [libx264 @ 0x7fcf1c05ba00] mb I  I16..4:  7.0% 62.2% 30.8%
  
  [libx264 @ 0x7fcf1c05ba00] mb P  I16..4:  0.2%  0.8%  0.1%  P16..4: 52.8% 18.7% 12.5%  0.0%  0.0%    skip:14.9%
  
  [libx264 @ 0x7fcf1c05ba00] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 30.0%  0.8%  0.1%  direct: 0.9%  skip:68.2%  L0:36.0% L1:62.1% BI: 2.0%
  
  [libx264 @ 0x7fcf1c05ba00] 8x8 transform intra:66.4% inter:78.3%
  
  [libx264 @ 0x7fcf1c05ba00] coded y,uvDC,uvAC intra: 79.3% 93.6% 84.9% inter: 13.6% 32.2% 10.4%
  
  [libx264 @ 0x7fcf1c05ba00] i16 v,h,dc,p: 50% 19%  7% 24%
  
  [libx264 @ 0x7fcf1c05ba00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 20% 11%  5%  8% 10%  9%  7%  8%
  
  [libx264 @ 0x7fcf1c05ba00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 22%  8%  5%  8%  8% 10%  5%  5%
  
  [libx264 @ 0x7fcf1c05ba00] i8c dc,h,v,p: 42% 22% 24% 13%
  
  [libx264 @ 0x7fcf1c05ba00] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7fcf1c05ba00] ref P L0: 48.7% 16.3% 25.6%  9.4%
  
  [libx264 @ 0x7fcf1c05ba00] ref B L0: 73.7% 21.3%  5.0%
  
  [libx264 @ 0x7fcf1c05ba00] ref B L1: 90.7%  9.3%
  
  [libx264 @ 0x7fcf1c05ba00] kb/s:647.04

• Unable to open video from C++ in opencv. It works from python

  3 septembre 2014, par user3612710

  I’m trying to use open cv (2.4.9) video support from within C++. However, when I try to open a video file with cv::VideoCapture I get

  warning: Error opening file (/tmp/opencv-mLsrDm/opencv-2.4.9/modules/highgui/src/cap_ffmpeg_impl.hpp:545)
  
  WARNING: Couldn't read movie file 11:28:39.mp4

  Using cv2.VideoCapture from within python on the same file works. The python wrappers are from the same build of opencv so I’m a bit perplexed.

  Mac os 10.9.4. OpenCV is built with ffmpeg (but no quicktime) via homebrew.

  I’m linking against all the libraries that the the python cv2.so is linked against.

  Any ideas ? Thanks.