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• avformat/matroskadec : Improve check for level 1 duplicates

  17 mai 2019, par Andreas Rheinhardt

  avformat/matroskadec : Improve check for level 1 duplicates
  If a file uses unknown-length level 1 elements besides clusters and such
  
  elements are after the first cluster, then these elements will usually
  
  be parsed twice : Once during parsing of the file header and once when
  
  reading the file reaches the position where these elements are located.
  
  The second time the element is parsed leads to a "Duplicate element"
  
  error message. Known-length elements are not affected by this as they
  
  are skipped except during parsing the header.
  This commit fixes this by explicitly adding a check for whether the
  
  position of the element to be parsed is the same as the position of the
  
  already known level 1 element.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskadec.c

• avformat/matroskaenc : Avoid seeking when writing level 1 elements

  20 avril 2019, par Andreas Rheinhardt

  avformat/matroskaenc : Avoid seeking when writing level 1 elements
  Up until now, the writing process for level 1 elements (those elements
  
  for which CRC-32 elements are written by default) was this in case the
  
  output was seekable : Write the EBML ID, write an "unkown length" EBML
  
  number of the desired length, then write the element into a dynamic
  
  buffer, then write the dynamic buffer (after possible calculation and
  
  writing of the CRC-element), then seek back to the size element and
  
  overwrite the unknown-size element with the real size. The seeking and
  
  overwriting part has been eliminated by not writing the size initially.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/matroskaenc.c

• Why does this ffmpeg filter result in an "Invalid Size" error ?

  10 avril 2019, par pdoherty926

  Why do I see this error message :

  [Parsed_scale_0 @ 0x559a264c28a0] Invalid size ’if(gt(iw’

  [AVFilterGraph @ 0x559a268a19e0] Error initializing filter ’scale’

  with args ’if(gt(iw’ Error initializing complex filters.

  Invalid argument

  when trying to crop a video using ffmpeg and the following complex filter :

  ffmpeg -f mp4 -ss 01:24 \ 
  
    -i https://storage.googleapis.com/bucket/video.mp4 \
  
    -y \
  
    -filter_complex scale='if(gt(iw,ih),-1,616):if(gt(iw,ih),1440,-1)', crop=1440:616 \
  
    -an \
  
    -vcodec libx264 \
  
    -r 60 -pix_fmt yuv420p \
  
    -movflags faststart \
  
    -f mp4 \
  
    -t 1 \
  
    /tmp/asset.1554913197962.mp4

  In case it’s relevant, here’s the output of ffprobe :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'https://storage.googleapis.com/bucket/video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.56.101
  
    Duration: 00:02:53.76, start: 0.000000, bitrate: 2910 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 2777 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      "streams": [
  
          {
  
              "index": 0,
  
              "codec_name": "h264",
  
              "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
  
              "profile": "High",
  
              "codec_type": "video",
  
              "codec_time_base": "1001/60000",
  
              "codec_tag_string": "avc1",
  
              "codec_tag": "0x31637661",
  
              "width": 1920,
  
              "height": 1080,
  
              "coded_width": 1920,
  
              "coded_height": 1080,
  
              "has_b_frames": 1,
  
              "sample_aspect_ratio": "1:1",
  
              "display_aspect_ratio": "16:9",
  
              "pix_fmt": "yuv420p",
  
              "level": 40,
  
              "color_range": "tv",
  
              "color_space": "bt709",
  
              "color_transfer": "bt709",
  
              "color_primaries": "bt709",
  
              "chroma_location": "left",
  
              "refs": 1,
  
              "is_avc": "true",
  
              "nal_length_size": "4",
  
              "r_frame_rate": "30000/1001",
  
              "avg_frame_rate": "30000/1001",
  
              "time_base": "1/90000",
  
              "start_pts": 0,
  
              "start_time": "0.000000",
  
              "duration_ts": 15633630,
  
              "duration": "173.707000",
  
              "bit_rate": "2777254",
  
              "bits_per_raw_sample": "8",
  
              "nb_frames": "5206",
  
              "disposition": {
  
                  "default": 1,
  
                  "dub": 0,
  
                  "original": 0,
  
                  "comment": 0,
  
                  "lyrics": 0,
  
                  "karaoke": 0,
  
                  "forced": 0,
  
                  "hearing_impaired": 0,
  
                  "visual_impaired": 0,
  
                  "clean_effects": 0,
  
                  "attached_pic": 0,
  
                  "timed_thumbnails": 0
  
              },
  
              "tags": {
  
                  "language": "und",
  
                  "handler_name": "VideoHandler"
  
              }
  
          },
  
          {
  
              "index": 1,
  
              "codec_name": "aac",
  
              "codec_long_name": "AAC (Advanced Audio Coding)",
  
              "profile": "LC",
  
              "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,
  
              "r_frame_rate": "0/0",
  
              "avg_frame_rate": "0/0",
  
              "time_base": "1/44100",
  
              "start_pts": 0,
  
              "start_time": "0.000000",
  
              "duration_ts": 7662596,
  
              "duration": "173.755011",
  
              "bit_rate": "125588",
  
              "max_bit_rate": "125588",
  
              "nb_frames": "7483",
  
              "disposition": {
  
                  "default": 1,
  
                  "dub": 0,
  
                  "original": 0,
  
                  "comment": 0,
  
                  "lyrics": 0,
  
                  "karaoke": 0,
  
                  "forced": 0,
  
                  "hearing_impaired": 0,
  
                  "visual_impaired": 0,
  
                  "clean_effects": 0,
  
                  "attached_pic": 0,
  
                  "timed_thumbnails": 0
  
              },
  
              "tags": {
  
                  "language": "eng",
  
                  "handler_name": "SoundHandler"
  
              }
  
          }
  
      ],
  
      "format": {
  
          "filename": "https://storage.googleapis.com/bucket/video.mp4",
  
          "nb_streams": 2,
  
          "nb_programs": 0,
  
          "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
  
          "format_long_name": "QuickTime / MOV",
  
          "start_time": "0.000000",
  
          "duration": "173.755000",
  
          "size": "63209767",
  
          "bit_rate": "2910294",
  
          "probe_score": 100,
  
          "tags": {
  
              "major_brand": "isom",
  
              "minor_version": "512",
  
              "compatible_brands": "isomiso2avc1mp41",
  
              "encoder": "Lavf57.56.101"
  
          }
  
      }
  
  }