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• YUV to RGB by Shader on iPhone

  27 octobre 2012, par user1333656

  Currently I am developing a video player using FFMPEG.
  I'm trying to convert YUV420P to RGB by Shader to reduce performance hit and I could see it works fine. The problem is caused when I try to change image size.

  Case 1. YUV to RGB is perfect. but the image is not exactly fit to Texture Bounds.
  For example, if i play 640x360 video, right (640-512) part is cropped and bottom (512-360) is filled with green colored rectangle.

  FRAME_X=512; //This is texture size
  
  FRAME_Y=512;
  
  
  
      avpicture_fill((AVPicture *) f, [currentVideoBuffer.data mutableBytes],
  
                 enc->pix_fmt,
  
                 FRAME_X, FRAME_Y);
  
  
  
      av_picture_copy((AVPicture *) f, (AVPicture *) avFrame,
  
                  enc->pix_fmt,
  
                  enc->width, enc->height);

  ....

  int yuvWidth= FRAME_X ;
  
  int  yuvHeight= FRAME_Y;
  
  glBindTexture ( GL_TEXTURE_2D, textureIdY );
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 
  
  yuvWidth, yuvHeight, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, y_channel);
  
  
  
  
  
  glBindTexture ( GL_TEXTURE_2D, textureIdU );
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE,
  
  yuvWidth/2, yuvHeight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, u_channel);
  
  
  
  glBindTexture ( GL_TEXTURE_2D, textureIdV );
  
  glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 
  
  yuvWidth/2, yuvHeight/2, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, v_channel);

  Case 2. If i set actual image size to texture size, then image is exactly fit to texture but the color of image is a little bit strange. It has too much green color.

  Does anybody give me some clues for this ??
  Thanks in advance.

• How to export audio from a iPhone video file with FFmpeg ?

  11 janvier 2020, par DanScripter

  UPDATE 1 the problem resides in the input read-stream. (check below)

  I am using fluent-ffmpeg (version : 2.1.2) to get a .mp3 file out of a video file that I input as a stream .createReadStream(). I output the file as a .pipe to a remoteWriteStream.

  ffmpeg -i pipe:0 -vn -f mp3 -acodec mp3 -movflags frag_keyframe+empty_moov pipe:1

  This works fine with .mp4, .webm and .mov (codec : prores) files.

  But it somehow does not want to work with a .mov out of an iPhone 11. FFmpeg is not giving me any error when running above code. It creates the .mp3 file but the size is just 152 B and it is not playable.

  I ffprobed the iPhone .mov files it returns this :

  "{ streams: 
  
     [ { index: 0,
  
         codec_name: 'hevc',
  
         codec_long_name: 'H.265 / HEVC (High Efficiency Video Coding)',
  
         profile: 'Main',
  
         codec_type: 'video',
  
         codec_time_base: '1111/33300',
  
         codec_tag_string: 'hvc1',
  
         codec_tag: '0x31637668',
  
         width: 1920,
  
         height: 1080,
  
         coded_width: 1920,
  
         coded_height: 1088,
  
         has_b_frames: 2,
  
         sample_aspect_ratio: '0:1',
  
         display_aspect_ratio: '0:1',
  
         pix_fmt: 'yuv420p',
  
         level: 120,
  
         color_range: 'tv',
  
         color_space: 'bt709',
  
         color_transfer: 'bt709',
  
         color_primaries: 'bt709',
  
         chroma_location: 'unspecified',
  
         field_order: 'unknown',
  
         timecode: 'N/A',
  
         refs: 1,
  
         id: 'N/A',
  
         r_frame_rate: '30000/1001',
  
         avg_frame_rate: '33300/1111',
  
         time_base: '1/600',
  
         start_pts: 'N/A',
  
         start_time: 'N/A',
  
         duration_ts: 6666,
  
         duration: 11.11,
  
         bit_rate: 7611708,
  
         max_bit_rate: 'N/A',
  
         bits_per_raw_sample: 'N/A',
  
         nb_frames: 333,
  
         nb_read_frames: 'N/A',
  
         nb_read_packets: 'N/A',
  
         tags: [Object],
  
         disposition: [Object] },
  
       { index: 1,
  
         codec_name: 'aac',
  
         codec_long_name: 'AAC (Advanced Audio Coding)',
  
         profile: 'unknown',
  
         codec_type: 'audio',
  
         codec_time_base: '1/44100',
  
         codec_tag_string: 'mp4a',
  
         codec_tag: '0x6134706d',
  
         sample_fmt: 'fltp',
  
         sample_rate: 44100,
  
         channels: 2,
  
         channel_layout: 'stereo',
  
         bits_per_sample: 0,
  
         id: 'N/A',
  
         r_frame_rate: '0/0',
  
         avg_frame_rate: '0/0',
  
         time_base: '1/44100',
  
         start_pts: 'N/A',
  
         start_time: 'N/A',
  
         duration_ts: 489951,
  
         duration: 11.11,
  
         bit_rate: 135091,
  
         max_bit_rate: 192000,
  
         bits_per_raw_sample: 'N/A',
  
         nb_frames: 481,
  
         nb_read_frames: 'N/A',
  
         nb_read_packets: 'N/A',
  
         tags: [Object],
  
         disposition: [Object] },
  
       { index: 2,
  
         codec_name: 'unknown',
  
         codec_long_name: 'unknown',
  
         profile: 'unknown',
  
         codec_type: 'data',
  
         codec_tag_string: 'mebx',
  
         codec_tag: '0x7862656d',
  
         id: 'N/A',
  
         r_frame_rate: '0/0',
  
         avg_frame_rate: '0/0',
  
         time_base: '1/600',
  
         start_pts: 'N/A',
  
         start_time: 'N/A',
  
         duration_ts: 6666,
  
         duration: 11.11,
  
         bit_rate: 2670,
  
         max_bit_rate: 'N/A',
  
         bits_per_raw_sample: 'N/A',
  
         nb_frames: 38,
  
         nb_read_frames: 'N/A',
  
         nb_read_packets: 'N/A',
  
         tags: [Object],
  
         disposition: [Object] },
  
       { index: 3,
  
         codec_name: 'unknown',
  
         codec_long_name: 'unknown',
  
         profile: 'unknown',
  
         codec_type: 'data',
  
         codec_tag_string: 'mebx',
  
         codec_tag: '0x7862656d',
  
         id: 'N/A',
  
         r_frame_rate: '0/0',
  
         avg_frame_rate: '0/0',
  
         time_base: '1/600',
  
         start_pts: 'N/A',
  
         start_time: 'N/A',
  
         duration_ts: 6666,
  
         duration: 11.11,
  
         bit_rate: 7,
  
         max_bit_rate: 'N/A',
  
         bits_per_raw_sample: 'N/A',
  
         nb_frames: 1,
  
         nb_read_frames: 'N/A',
  
         nb_read_packets: 'N/A',
  
         tags: [Object],
  
         disposition: [Object] },
  
       { index: 4,
  
         codec_name: 'unknown',
  
         codec_long_name: 'unknown',
  
         profile: 'unknown',
  
         codec_type: 'data',
  
         codec_tag_string: 'mebx',
  
         codec_tag: '0x7862656d',
  
         id: 'N/A',
  
         r_frame_rate: '0/0',
  
         avg_frame_rate: '0/0',
  
         time_base: '1/600',
  
         start_pts: 'N/A',
  
         start_time: 'N/A',
  
         duration_ts: 6666,
  
         duration: 11.11,
  
         bit_rate: 18117,
  
         max_bit_rate: 'N/A',
  
         bits_per_raw_sample: 'N/A',
  
         nb_frames: 333,
  
         nb_read_frames: 'N/A',
  
         nb_read_packets: 'N/A',
  
         tags: [Object],
  
         disposition: [Object] } ],
  
    format: 
  
     { filename: 'pipe:0',
  
       nb_streams: 5,
  
       nb_programs: 0,
  
       format_name: 'mov,mp4,m4a,3gp,3g2,mj2',
  
       format_long_name: 'QuickTime / MOV',
  
       start_time: 'N/A',
  
       duration: 11.11,
  
       size: 'N/A',
  
       bit_rate: 'N/A',
  
       probe_score: 100,
  
       tags: 
  
        { major_brand: 'qt  ',
  
          minor_version: '0',
  
          compatible_brands: 'qt  ',
  
          creation_time: '2020-01-11T12:33:36.000000Z',
  
          'com.apple.quicktime.make': 'Apple',
  
          'com.apple.quicktime.model': 'iPhone 11',
  
          'com.apple.quicktime.software': '13.3',
  
          'com.apple.quicktime.creationdate': '2020-01-11T13:33:36+0100' } },
  
    chapters: [] }" 

  The created .mp3 file results in a undefined.

  I already tried to take the .mov re-encode it to an .mp4 via ffmpeg and then try the above code to get the .mp3 - still does not work.

  Any advice how I can make this work ?

  thanks !

  ---

  UPDATE 1
  The problem resides in the input stream ! When I download the file to the local machine and input it as as a local file, not as a read stream, it works perfectly.

  I am creating the stream from a google cloud bucket like this :

  const myBucket = storage.bucket('myBucket');
  
  const remoteReadStream = myBucket.file(file).createReadStream();

  Since this code is perfectly working with all other codecs, what maybe the issue while creating the read stream from the google cloud from a h265 file ?

• FFMPEG won't configure for iPhone

  5 août 2016, par iSkythe

  I have downloaded FFMPEG via svn, and put the gas-preprocessor into usr/local/bin. But, when I try to post the following code into terminal, it says : -bash: ./configure: No such file or directory

  This is the code :

  ./configure
  —cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc —as=’gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc’
  —sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.sdk —enable-cross-compile —target-os=darwin —arch=arm —cpu=arm1176jzf-s —disable-pic —enable-gpl —enable-postproc —disable-debug —disable-stripping —enable-avfilter —enable-avfilter-lavf —extra-cflags=’-arch armv6’ —extra-ldflags=’-arch armv6’

  I am using Snow Leopard 10.6.1. What am I doing wrong ?