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• FFMPEG encode video with alpha channel to flv

  29 novembre 2017, par tree

  I’m trying to encode a video (mov) to an flv with alpha channel in FFMPEG but I can’t seem to either

  1. find a codec that is supported
  2. find one that actually maintains the alpha

  Does anyone know how to set that up ?

  Thanks,

  ffmpeg -i abc_btr_1280x800_Takeover.mov -vcodec flv -pix_fmt yuv444p -s 1280x800 test4.flv

  here is the report...

  ffmpeg started on 2013-10-25 at 15:47:30
  
  Report written to "ffmpeg-20131025-154730.log"
  
  Command line: 
  
  ffmpeg -i abc_btr_1280x800_Takeover.mov -vcodec flv -pix_fmt yuv444p -s 1280x800     test4.flv -report
  
  ffmpeg version N-57367-g2f31b73 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Oct 23 2013 20:34:17 with gcc 4.8.2 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --    disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --    enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-    libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --    enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 47.101 / 52. 47.101
  
    libavcodec     55. 38.101 / 55. 38.101
  
    libavformat    55. 19.104 / 55. 19.104
  
    libavdevice    55.  4.100 / 55.  4.100
  
    libavfilter     3. 89.100 /  3. 89.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Splitting the commandline.
  
  Reading option '-i' ... matched as input file with argument     'abc_btr_1280x800_Takeover.mov'.
  
  Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to     copy stream)) with argument 'flv'.
  
  Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv444p'.
  
  Reading option '-s' ... matched as option 's' (set frame size (WxH or abbreviation)) with argument '1280x800'.
  
  Reading option 'test4.flv' ... matched as output file.
  
  Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option report (generate a report) with argument 1.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file abc_btr_1280x800_Takeover.mov.
  
  Successfully parsed a group of options.
  
  Opening an input file: abc_btr_1280x800_Takeover.mov.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] ISO: File Type Major Brand: qt  
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] File position before avformat_find_stream_info() is 281624339
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] File position after avformat_find_stream_info() is 288732
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'abc_btr_1280x800_Takeover.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2013-09-22 02:50:18
  
    Duration: 00:00:10.00, start: 0.000000, bitrate: 225299 kb/s
  
      Stream #0:0(eng), 1, 1/24: Video: qtrle (rle  / 0x20656C72), bgra, 1280x800, 225293 kb/s, SAR 1280:1280 DAR 8:5, 24 fps, 24 tbr, 24 tbn, 24 tbc (default)
  
      Metadata:
  
        creation_time   : 2013-09-22 02:50:18
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:00:00:00
  
      Stream #0:1(eng), 0, 1/24: Data: none (tmcd / 0x64636D74), 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-09-22 02:50:22
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:00:00:00
  
  Successfully opened the file.
  
  Parsing a group of options: output file test4.flv.
  
  Applying option vcodec (force video codec ('copy' to copy stream)) with argument flv.
  
  Applying option pix_fmt (set pixel format) with argument yuv444p.
  
  Applying option s (set frame size (WxH or abbreviation)) with argument 1280x800.
  
  Successfully parsed a group of options.
  
  Opening an output file: test4.flv.
  
  Successfully opened the file.
  
  detected 4 logical cores
  
  [graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'video_size' to value '1280x800'
  
  [graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'pix_fmt' to value '30'
  
  [graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'time_base' to value '1/24'
  
  [graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'pixel_aspect' to value '1280/1280'
  
  [graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'frame_rate' to value '24/1'
  
  [graph 0 input from stream 0:0 @ 0000000000303bc0] w:1280 h:800 pixfmt:bgra tb:1/24 fr:24/1 sar:1/1 sws_param:flags=2
  
  [scaler for output stream 0:0 @ 00000000003056a0] Setting 'w' to value '1280'
  
  [scaler for output stream 0:0 @ 00000000003056a0] Setting 'h' to value '800'
  
  [scaler for output stream 0:0 @ 00000000003056a0] Setting 'flags' to value '0x4'
  
  [scaler for output stream 0:0 @ 00000000003056a0] w:1280 h:800 flags:'0x4' interl:0
  
  Incompatible pixel format 'yuv444p' for codec 'flv', auto-selecting format 'yuv420p'
  
  [format @ 00000000002f8320] compat: called with args=[yuv420p]
  
  [format @ 00000000002f8320] Setting 'pix_fmts' to value 'yuv420p'
  
  [AVFilterGraph @ 000000000085bc60] query_formats: 5 queried, 4 merged, 0 already done, 0 delayed
  
  [scaler for output stream 0:0 @ 00000000003056a0] w:1280 h:800 fmt:bgra sar:1/1 -> w:1280 h:800 fmt:yuv420p sar:1/1 flags:0x4
  
  [flv @ 0000000000374be0] intra_quant_bias = 0 inter_quant_bias = -64
  
  Output #0, flv, to 'test4.flv':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      encoder         : Lavf55.19.104
  
      Stream #0:0(eng), 0, 1/1000: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p,             1280x800 [SAR 1:1 DAR 8:5], q=2-31, 200 kb/s, 1k tbn, 24 tbc (default)
  
      Metadata:
  
        creation_time   : 2013-09-22 02:50:18
  
            handler_name    : Apple Alias Data Handler
  
            timecode        : 00:00:00:00        
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (qtrle -> flv)
  
  Press [q] to stop, [?] for help
  
  frame=   27 fps=0.0 q=31.0 size=     351kB time=00:00:01.12 bitrate=2554.2kbits/s    
  
  frame=   46 fps= 45 q=31.0 size=     477kB time=00:00:01.91 bitrate=2039.5kbits/s    
  
  frame=   60 fps= 39 q=31.0 size=     543kB time=00:00:02.50 bitrate=1779.4kbits/s    
  
  frame=   74 fps= 36 q=31.0 size=     629kB time=00:00:03.08 bitrate=1672.4kbits/s    
  
  frame=   96 fps= 37 q=31.0 size=     795kB time=00:00:04.00 bitrate=1627.4kbits/s    
  
  frame=  123 fps= 40 q=31.0 size=     924kB time=00:00:05.12 bitrate=1477.0kbits/s    
  
  frame=  149 fps= 41 q=31.0 size=    1133kB time=00:00:06.20 bitrate=1494.7kbits/s    
  
  frame=  175 fps= 43 q=31.0 size=    1224kB time=00:00:07.29 bitrate=1375.5kbits/s    
  
  frame=  201 fps= 44 q=31.0 size=    1352kB time=00:00:08.37 bitrate=1322.7kbits/s    
  
  frame=  228 fps= 45 q=31.0 size=    1461kB time=00:00:09.50 bitrate=1260.1kbits/s    
  
  [output stream 0:0 @ 00000000003053c0] EOF on sink link output stream 0:0:default.
  
  No more output streams to write to, finishing.
  
  frame=  240 fps= 45 q=31.0 Lsize=    1600kB time=00:00:10.00 bitrate=1310.4kbits/s    
  
  
  
  video:1596kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.252476%
  
  240 frames successfully decoded, 0 decoding errors
  
  [AVIOContext @ 000000000032dfc0] Statistics: 3 seeks, 242 writeouts
  
  [AVIOContext @ 000000000085bde0] Statistics: 281664506 bytes read, 3 seeks

• avfilter/vf_fade : add >8 bit support for black and alpha fade

  8 février 2020, par Paul B Mahol

  avfilter/vf_fade : add >8 bit support for black and alpha fade
  

  • [DH] libavfilter/vf_fade.c

• Convert FLV video with alpha channel to PNGs with transparency

  3 février 2020, par Zack

  I have some FLV videos with alpha channels, and I want to convert each of them to PNG images using ffmpeg but keep the transparency.

  So far, I’ve tried this :

  ffmpeg -i input.flv -an -y %d.png

  But this outputs the PNG files with black background.

  Is there any way to do this ?

  Alternate acceptable solution : If I can output the images and give the alpha channel a certain color of my choice. I can then remove it later via imagemagick and convert that color to transparency.