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• Revision 32c4fdec78 : Experimental change to speed 1 settings. Allow tx search for ARF and GF helps q

  21 mars 2014, par Paul Wilkins

  Changed Paths :
   Modify /vp9/encoder/vp9_onyx_if.c

  
  
  Experimental change to speed 1 settings.

  Allow tx search for ARF and GF helps quality but a little slower.
  Setting subpel_iters_per_step to 1 improves encode speed.
  Setting sf->mode_skip_start = 10 improves speed.

  Initial local results suggest overall impact on quality is neutral
  but encode is up to 15% faster.

  Change-Id : Ibde02cae6626a44c10a1da0cefe888afbb51f037

• ffmpeg hwmap SW decoded frame to OpenCL and hwmap back to h264 for SW encode

  3 novembre 2019, par Oleksandr Kyrpa

  I trying speed up process and avoid copy frames between GPU and CPU. But got error : "Segmentation fault : 11", so may be I’m doing something wrong ?

  My full ffmpeg command and log here :

  ./ffmpeg -i ../720.mp4 -init_hw_device opencl=ocl:0.1 -filter_hw_device ocl  -filter_complex "hwmap,avgblur_opencl=30,hwmap"  -c:v h264 -an -t 10 -y ../out_blur.mp4 -loglevel debug

  Output :

  ./ffmpeg -i ../720.mp4 -init_hw_device opencl=ocl:0.1 -filter_hw_device ocl  -filter_complex "hwmap,avgblur_opencl=30,hwmap"  -c:v h264 -an -t 10 -y ../out_blur.mp4 -loglevel debug
  
  ffmpeg version N-95621-g53c21c2d6b Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.0 (clang-1000.10.44.4)
  
    configuration: --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libfreetype --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --disable-ffplay --enable-nonfree --enable-opencl
  
    libavutil      56. 35.101 / 56. 35.101
  
    libavcodec     58. 60.100 / 58. 60.100
  
    libavformat    58. 33.100 / 58. 33.100
  
    libavdevice    58.  9.100 / 58.  9.100
  
    libavfilter     7. 66.100 /  7. 66.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Splitting the commandline.
  
  Reading option '-i' ... matched as input url with argument '../720.mp4'.
  
  Reading option '-init_hw_device' ... matched as option 'init_hw_device' (initialise hardware device) with argument 'opencl=ocl:0.1'.
  
  Reading option '-filter_hw_device' ... matched as option 'filter_hw_device' (set hardware device used when filtering) with argument 'ocl'.
  
  Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument 'hwmap,unsharp_opencl=lx=17:ly=17:la=5,hwmap'.
  
  Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'h264'.
  
  Reading option '-an' ... matched as option 'an' (disable audio) with argument '1'.
  
  Reading option '-t' ... matched as option 't' (record or transcode "duration" seconds of audio/video) with argument '10'.
  
  Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
  
  Reading option '../out_blur.mp4' ... matched as output url.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option init_hw_device (initialise hardware device) with argument opencl=ocl:0.1.
  
  [AVHWDeviceContext @ 0x7fbb1ec08480] 1 OpenCL platforms found.
  
  [AVHWDeviceContext @ 0x7fbb1ec08480] 3 OpenCL devices found on platform "Apple".
  
  [AVHWDeviceContext @ 0x7fbb1ec08480] 0.1: Apple / HD Graphics 4000
  
  Applying option filter_hw_device (set hardware device used when filtering) with argument ocl.
  
  Applying option filter_complex (create a complex filtergraph) with argument hwmap,unsharp_opencl=lx=17:ly=17:la=5,hwmap.
  
  Applying option y (overwrite output files) with argument 1.
  
  Applying option loglevel (set logging level) with argument debug.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url ../720.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: ../720.mp4.
  
  [NULL @ 0x7fbb1f818c00] Opening '../720.mp4' for reading
  
  [file @ 0x7fbb1ec3d600] Setting default whitelist 'file,crypto'
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbb1f818c00] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbb1f818c00] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbb1f818c00] Unknown dref type 0x206c7275 size 12
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbb1f818c00] Processing st: 0, edit list 0 - media time: 0, duration: 300300
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbb1f818c00] Before avformat_find_stream_info() pos: 4123312 bytes read:34929 seeks:1 nb_streams:1
  
  [h264 @ 0x7fbb1f9ae800] nal_unit_type: 7(SPS), nal_ref_idc: 1
  
  [h264 @ 0x7fbb1f9ae800] nal_unit_type: 8(PPS), nal_ref_idc: 1
  
  [h264 @ 0x7fbb1f9ae800] nal_unit_type: 6(SEI), nal_ref_idc: 0
  
  [h264 @ 0x7fbb1f9ae800] nal_unit_type: 5(IDR), nal_ref_idc: 1
  
  [h264 @ 0x7fbb1f9ae800] Format yuv420p chosen by get_format().
  
  [h264 @ 0x7fbb1f9ae800] Reinit context to 1280x720, pix_fmt: yuv420p
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbb1f818c00] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbb1f818c00] After avformat_find_stream_info() pos: 38244 bytes read:73125 seeks:2 frames:1
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../720.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.33.100
  
    Duration: 00:00:10.01, start: 0.000000, bitrate: 3295 kb/s
  
      Stream #0:0(und), 1, 1/30000: Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(left), 1280x720 [SAR 1:1 DAR 16:9], 0/1, 3293 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc (default)
  
      Metadata:
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/24/2018.
  
  Successfully opened the file.
  
  [Parsed_unsharp_opencl_1 @ 0x7fbb1ec45640] Setting 'lx' to value '17'
  
  [Parsed_unsharp_opencl_1 @ 0x7fbb1ec45640] Setting 'ly' to value '17'
  
  [Parsed_unsharp_opencl_1 @ 0x7fbb1ec45640] Setting 'la' to value '5'
  
  Parsing a group of options: output url ../out_blur.mp4.
  
  Applying option c:v (codec name) with argument h264.
  
  Applying option an (disable audio) with argument 1.
  
  Applying option t (record or transcode "duration" seconds of audio/video) with argument 10.
  
  Successfully parsed a group of options.
  
  Opening an output file: ../out_blur.mp4.
  
  Matched encoder 'libx264' for codec 'h264'.
  
  [file @ 0x7fbb1ec44680] Setting default whitelist 'file,crypto'
  
  Successfully opened the file.
  
  detected 8 logical cores
  
  [h264 @ 0x7fbb1f9a9800] nal_unit_type: 7(SPS), nal_ref_idc: 1
  
  [h264 @ 0x7fbb1f9a9800] nal_unit_type: 8(PPS), nal_ref_idc: 1
  
  Stream mapping:
  
    Stream #0:0 (h264) -> hwmap
  
    hwmap -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
      Last message repeated 1 times
  
  [h264 @ 0x7fbb1f9a9800] nal_unit_type: 6(SEI), nal_ref_idc: 0
  
  [h264 @ 0x7fbb1f9a9800] nal_unit_type: 5(IDR), nal_ref_idc: 1
  
  [h264 @ 0x7fbb1f9a9800] Format yuv420p chosen by get_format().
  
  [h264 @ 0x7fbb1f9a9800] Reinit context to 1280x720, pix_fmt: yuv420p
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
  [h264 @ 0x7fbb1f9b7e00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
  [h264 @ 0x7fbb1f9cf200] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
  [h264 @ 0x7fbb1fa04c00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
  [h264 @ 0x7fbb1fa1b000] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
  [h264 @ 0x7fbb1fa24800] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
  [h264 @ 0x7fbb1fa24e00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
  
  [h264 @ 0x7fbb1fa25400] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  [h264 @ 0x7fbb22809200] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
  
  [Parsed_unsharp_opencl_1 @ 0x7fbb1ed04e80] Setting 'lx' to value '17'
  
  [Parsed_unsharp_opencl_1 @ 0x7fbb1ed04e80] Setting 'ly' to value '17'
  
  [Parsed_unsharp_opencl_1 @ 0x7fbb1ed04e80] Setting 'la' to value '5'
  
  [graph 0 input from stream 0:0 @ 0x7fbb1ee09040] Setting 'video_size' to value '1280x720'
  
  [graph 0 input from stream 0:0 @ 0x7fbb1ee09040] Setting 'pix_fmt' to value '0'
  
  [graph 0 input from stream 0:0 @ 0x7fbb1ee09040] Setting 'time_base' to value '1/30000'
  
  [graph 0 input from stream 0:0 @ 0x7fbb1ee09040] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 0:0 @ 0x7fbb1ee09040] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 0x7fbb1ee09040] Setting 'frame_rate' to value '30000/1001'
  
  [graph 0 input from stream 0:0 @ 0x7fbb1ee09040] w:1280 h:720 pixfmt:yuv420p tb:1/30000 fr:30000/1001 sar:1/1 sws_param:flags=2
  
  [format @ 0x7fbb1ed0a080] Setting 'pix_fmts' to value 'yuv420p|yuvj420p|yuv422p|yuvj422p|yuv444p|yuvj444p|nv12|nv16|nv21|yuv420p10le|yuv422p10le|yuv444p10le|nv20le'
  
  [AVFilterGraph @ 0x7fbb21004240] query_formats: 7 queried, 6 merged, 0 already done, 0 delayed
  
  [Parsed_hwmap_2 @ 0x7fbb1ed03e00] picking yuv420p out of 13 ref:opencl alpha:1
  
  [Parsed_hwmap_0 @ 0x7fbb1ed09940] Configure hwmap yuv420p -> opencl.
  
  [Parsed_hwmap_2 @ 0x7fbb1ed03e00] Configure hwmap opencl -> yuv420p.
  
  [hwmap @ 0x7fbb1ed03940] Filter input: yuv420p, 1280x720 (0).
  
  Segmentation fault: 11

• Capture Thumbnail Whilte Downloading Youtube Video

  31 décembre 2012, par Minime

  I want to capture a thumbnail of Youtube video on certain timeline. (e.g. 3.2sec)
  I used ytdl and fluent-ffmpeg with node.js to implement it.
  It was possible to capture a thumbnail when the downloading has finished.

  var fs = require('fs');
  
  var ytdl = require('ytdl');
  
  var ffmpeg = require('fluent-ffmpeg');
  
  var videostream = fs.createWriteStream('video.flv');
  
  var myytdl = ytdl('http://www.youtube.com/watch?v=A02s8omM_hI');
  
  myytdl.pipe(videostream);
  
  videostream.on('close',function() {
  
    console.log('Downloading complete...');
  
    var proc = new ffmpeg({ source: 'video.flv', nolog: true })
  
    .withSize('150x100')
  
    .takeScreenshots(1, '/home/test', function(err) {
  
      console.log(err || 'Screenshots were saved');
  
    });
  
  });

  However, I couldn't implement to capture a thumbnail while downloading. Basic idea of what I want to do is as below.

  1. Download Youtube video starting at X sec. (Worked)
  2. Pipe it to Readable/Writable(Duplex) Memory Stream (Need Advise)
  3. During downloading, check if stream has enough data to capture the first frame, which is at X sec. (Need Advise)
  4. Capture the first frame, then stop downloading

  For 2, I've realized that node.js will have Duplex Stream on coming v0.9.x, but it seems not working properly. Anyone who has good idea to implement bullet 2,3 ?