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• ffmpeg conversion for apple tv

  24 janvier 2013, par Sam

  I have one particular movie file that is giving me grief while I am trying to convert my movie library to be able to be viewed on my Apple TV. I have been using iFlicks to convert all of my files and have only had one issue. The original of this particular movie file plays fine but after it has been converted the video freezes after a few minutes but the audio keeps playing. I tried using ffmpeg to convert the file but now the file is very choppy. The first time it is played the video will be choppy, the next time the audio will be choppy... but it plays fine in VLC for some reason. So I was thinking that maybe I have chosen the wrong codecs to suit Quicktime/Apple TV. Below is the command I used for ffmpeg. Have I chosen the right codecs and actually written the command correctly ? (I haven't really used ffmpeg before...)

  ffmpeg -i input.avi -vcodec libx264 -acodec libfaac output.m4v

• Green tint color shift converting RGBA to YUV420p ffmpeg libavcodec

  2 août 2017, par Michael B

  I was wondering someone could help. I’m currently taking converting RBGA bitmaps to YUV420p before encoding the frames with h264 codec and dumping the encoded packets to file successfully.

  I’m also able to playback the h264 video file in VLC. However, there seems to be a color shift which is more apparent where grey is actually light tint of screen. I’m used a an animation video as my example which is supposed to show a blue sky in the background, however after converting the image, I’m getting an orange sky background. Do you have any ideas how I can fix this please ?

  Do you happen to know if it’s possible to convert rgba to yuv BEFORE calling sws_scale and before encoding packet ?

• FFmpeg : Green images from TS file

  5 septembre 2017, par Tatsiana

  I use ffmpeg to generate images from a TS file and at some places it generates green images. I checked a couple of ffmpeg versions. The issue reproduces on
  3.3.3, 2.8.11, 2.7.7, but doesn’t on 2.6.9.
  What might be the reason ?

  For example, the output of 2.8.11 :

      $ ffmpeg -ss 00:42:20 -i video.ts -frames:v 1 out_42_20.jpg -loglevel debug
      ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
        built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1 16.04.4) 20160609
        configuration : —prefix=/usr —extra-version=0ubuntu0.16.04.1 —build-suffix=-ffmpeg —toolchain=hardened —libdir=/usr/lib/x86_64-linux-=/usr/include/x86_64-linux-gnu —cc=cc —cxx=g++ —enable-gpl —enable-shared —disable-stripping —disable-decoder=libopenjpeg —disable-dhroedinger —enable-avresample —enable-avisynth —enable-gnutls —enable-ladspa —enable-libass —enable-libbluray —enable-libbs2b —enab-enable-libcdio —enable-libflite —enable-libfontconfig —enable-libfreetype —enable-libfribidi —enable-libgme —enable-libgsm —enable—enable-libmp3lame —enable-libopenjpeg —enable-libopus —enable-libpulse —enable-librtmp —enable-libschroedinger —enable-libshine —enpy —enable-libsoxr —enable-libspeex —enable-libssh —enable-libtheora —enable-libtwolame —enable-libvorbis —enable-libvpx —enable-linable-libwebp —enable-libx265 —enable-libxvid —enable-libzvbi —enable-openal —enable-opengl —enable-x11grab —enable-libdc1394 —enab83 —enable-libzmq —enable-frei0r —enable-libx264 —enable-libopencv
        libavutil      54. 31.100 / 54. 31.100
        libavcodec     56. 60.100 / 56. 60.100
        libavformat    56. 40.101 / 56. 40.101
        libavdevice    56.  4.100 / 56.  4.100
        libavfilter     5. 40.101 /  5. 40.101
        libavresample   2.  1.  0 /  2.  1.  0
        libswscale      3.  1.101 /  3.  1.101
        libswresample   1.  2.101 /  1.  2.101
        libpostproc    53.  3.100 / 53.  3.100
      Splitting the commandline.
      Reading option ’-ss’ ... matched as option ’ss’ (set the start time offset) with argument ’00:42:20’.
      Reading option ’-i’ ... matched as input url with argument ’video.ts’.
      Reading option ’-frames:v’ ... matched as option ’frames’ (set the number of frames to output) with argument ’1’.
      Reading option ’out_42_20.jpg’ ... 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 loglevel (set logging level) with argument debug.
      Successfully parsed a group of options.
      Parsing a group of options : input url video.ts.
      Applying option ss (set the start time offset) with argument 00:42:20.
      Successfully parsed a group of options.
      Opening an input file : video.ts.
      [mpegts @ 0x22ba400] Format mpegts probed with size=2048 and score=100
      [mpegts @ 0x22ba400] stream=0 stream_type=1b pid=1e1 prog_reg_desc=
      [mpegts @ 0x22ba400] stream=1 stream_type=f pid=1e2 prog_reg_desc=
      [mpegts @ 0x22ba400] stream=2 stream_type=6 pid=1e3 prog_reg_desc=
      [mpegts @ 0x22ba400] Before avformat_find_stream_info() pos : 0 bytes read:32768 seeks:0
      [h264 @ 0x22be840] no picture
      [mpegts @ 0x22ba400] max_analyze_duration 5000000 reached at 5000000 microseconds st:0
      [mpegts @ 0x22ba400] stream 0 : no PTS found at end of file, duration not set
      [mpegts @ 0x22ba400] After avformat_find_stream_info() pos : 0 bytes read:4026800 seeks:3 frames:550
      Input #0, mpegts, from ’video.ts’ :
        Duration : 02:15:27.97, start : 1.079989, bitrate : 4983 kb/s
        Program 1
          Stream #0:0[0x1e1], 216, 1/90000 : Video : h264 (High), 4 reference frames ([27][0][0][0] / 0x001B), yuv420p(left), 1920x1080 (1920x1088)R 16:9], 1/50, 25 fps, 50 tbr, 90k tbn, 50 tbc
          Stream #0:1[0x1e2](und), 203, 1/90000 : Audio : aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 127 kb/s
          Stream #0:2[0x1e3](und), 131, 1/90000 : Audio : ac3 ([6][0][0][0] / 0x0006), 48000 Hz, 5.1(side), fltp, 384 kb/s
      Successfully opened the file.
      Parsing a group of options : output url out_42_20.jpg.
      Applying option frames:v (set the number of frames to output) with argument 1.
      Successfully parsed a group of options.
      Opening an output file : out_42_20.jpg.
      Successfully opened the file.
      detected 1 logical cores
      [graph 0 input from stream 0:0 @ 0x22ba280] Setting ’video_size’ to value ’1920x1080’
      [graph 0 input from stream 0:0 @ 0x22ba280] Setting ’pix_fmt’ to value ’0’
      [graph 0 input from stream 0:0 @ 0x22ba280] Setting ’time_base’ to value ’1/90000’
      [graph 0 input from stream 0:0 @ 0x22ba280] Setting ’pixel_aspect’ to value ’1/1’
      [graph 0 input from stream 0:0 @ 0x22ba280] Setting ’sws_param’ to value ’flags=2’
      [graph 0 input from stream 0:0 @ 0x22ba280] Setting ’frame_rate’ to value ’25/1’
      [graph 0 input from stream 0:0 @ 0x22ba280] w:1920 h:1080 pixfmt:yuv420p tb:1/90000 fr:25/1 sar:1/1 sws_param:flags=2
      [format @ 0x2328360] compat : called with args=[yuvj420p|yuvj422p|yuvj444p]
      [format @ 0x2328360] Setting ’pix_fmts’ to value ’yuvj420p|yuvj422p|yuvj444p’
      [auto-inserted scaler 0 @ 0x2326600] Setting ’flags’ to value ’bicubic’
      [auto-inserted scaler 0 @ 0x2326600] w:iw h:ih flags :’bicubic’ interl:0
      [format @ 0x2328360] auto-inserting filter ’auto-inserted scaler 0’ between the filter ’Parsed_null_0’ and the filter ’format’
      [AVFilterGraph @ 0x2327ba0] query_formats : 5 queried, 3 merged, 1 already done, 0 delayed
      [auto-inserted scaler 0 @ 0x2326600] picking yuvj420p out of 3 ref:yuv420p alpha:0
      [swscaler @ 0x2310660] deprecated pixel format used, make sure you did set range correctly
      [auto-inserted scaler 0 @ 0x2326600] w:1920 h:1080 fmt:yuv420p sar:1/1 -> w:1920 h:1080 fmt:yuvj420p sar:1/1 flags:0x4
      [mjpeg @ 0x2327620] Forcing thread count to 1 for MJPEG encoding, use -thread_type slice or a constant quantizer if you want to use multipl
      [mjpeg @ 0x2327620] intra_quant_bias = 96 inter_quant_bias = 0
      Output #0, image2, to ’out_42_20.jpg’ :
        Metadata :
          encoder : Lavf56.40.101
          Stream #0:0, 0, 1/25 : Video : mjpeg, 1 reference frame, yuvj420p(pc, left), 1920x1080 [SAR 1:1 DAR 16:9], 1/25, q=2-31, 200 kb/s, 25 fps tbc
          Metadata :
            encoder : Lavc56.60.100 mjpeg
      Stream mapping :
        Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
      Press [q] to stop, [?] for help
      [h264 @ 0x232a040] Missing reference picture, default is 0
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] Missing reference picture, default is 0
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] Missing reference picture, default is 0
      [h264 @ 0x232a040] decode_slice_header error
      timestamp discontinuity 0, new offset= -2541079989
      [h264 @ 0x232a040] no picture
      [h264 @ 0x232a040] illegal short term buffer state detected
      [h264 @ 0x232a040] Missing reference picture, default is 65537
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] Missing reference picture, default is 65537
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] Missing reference picture, default is 65537
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] Missing reference picture, default is 65537
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] Missing reference picture, default is 65537
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] Missing reference picture, default is 65537
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] Missing reference picture, default is 65537
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] Missing reference picture, default is 65537
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] Missing reference picture, default is 65537
      [h264 @ 0x232a040] decode_slice_header error
      [h264 @ 0x232a040] no picture
      *** 0 dup !
      [AVIOContext @ 0x2448c00] Statistics : 0 seeks, 2 writeouts
      No more output streams to write to, finishing.
      frame=    1 fps=0.0 q=2.2 Lsize=N/A time=00:00:00.04 bitrate=N/A dup=1 drop=1
      video:32kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown
      Input file #0 (video.ts) :
        Input stream #0:0 (video) : 9 packets read (261340 bytes) ; 3 frames decoded ;
        Input stream #0:1 (audio) : 0 packets read (0 bytes) ;
        Input stream #0:2 (audio) : 0 packets read (0 bytes) ;
        Total : 9 packets (261340 bytes) demuxed
      Output file #0 (out_42_20.jpg) :
        Output stream #0:0 (video) : 1 frames encoded ; 1 packets muxed (33209 bytes) ;
        Total : 1 packets (33209 bytes) muxed
      3 frames successfully decoded, 0 decoding errors
      [AVIOContext @ 0x22c2e40] Statistics : 8798032 bytes read, 36 seeks