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• avfilter/af_dynaudnorm : fix hang with too short input

  8 janvier 2017, par Paul B Mahol

  avfilter/af_dynaudnorm : fix hang with too short input
  The only thing we can do at such point is return samples unchanged.
  Signed-off-by : Paul B Mahol <onemda@gmail.com>
  

  • [DH] libavfilter/af_dynaudnorm.c

• Revision 463ba70581 : vp9_rd_pick_inter_mode_sb() reorganization * Reduce the number of short cirtcui

  20 février 2014, par Alex Converse

  Changed Paths :
   Modify /vp9/encoder/vp9_block.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  vp9_rd_pick_inter_mode_sb() reorganization

  * Reduce the number of short cirtcuit checks by pre-computing and combining like
  checks.
  * Postpone non-trivial initializations until after the shortcircuits are
  evaluated.
  * Add some consts and const pointers.

  No change to the actual results of the call or output of the encoder.

  Change-Id : Ie44c4702aec6e08cfe0b8b0ba3cd6b57206478d1

• How to retrieve the codecs in a format recognised by html5 players

  26 octobre 2020, par Mihai

  Web browsers and html5 players (i.e. Shaka, VideoJS) require a codecs parameter so that they can play certain video content.
Here is an example of such param : codecs="mp4a.40.5,avc1.4d400c".

  


  I've tried to use ffprobe but unfortunately the it returns the codecs using a different form(i.e. H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10).
Is there any library to convert the codec form provided by ffprobe in a form/format accepted by web browsers ? (i.e avc1.4d400c).

  


  $ ffprobe -print_format json -show_format -show_streams   a.ts 


Input #0, mpegts, from 'a.ts':
  Duration: 00:00:07.38, start: 55023.659744, bitrate: 1280 kb/s
  Program 1 
    Stream #0:0[0x1e1]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt470bg, progressive), 640x360 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x1e2](ron): Audio: aac (HE-AAC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 63 kb/s
    "streams": [
        {
            "index": 0,
            "codec_name": "h264",
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
            "profile": "Main",
            "codec_type": "video",
            "codec_time_base": "1/50",
            "codec_tag_string": "[27][0][0][0]",
            "codec_tag": "0x001b",
            "width": 640,
            "height": 360,
            "coded_width": 640,
            "coded_height": 368,
            "closed_captions": 0,
            "has_b_frames": 2,
            "sample_aspect_ratio": "1:1",
            "display_aspect_ratio": "16:9",
            "pix_fmt": "yuv420p",
            "level": 31,
            "color_range": "tv",
            "color_space": "bt470bg",
            "color_transfer": "bt470bg",
            "color_primaries": "bt470bg",
            "chroma_location": "left",
            "field_order": "progressive",
            "refs": 1,
            "is_avc": "false",
            "nal_length_size": "0",
            "id": "0x1e1",
            "r_frame_rate": "25/1",
            "avg_frame_rate": "25/1",
            "time_base": "1/90000",
            "start_pts": 4952253217,
            "start_time": "55025.035744",
            "duration_ts": 540000,
            "duration": "6.000000",
            "bits_per_raw_sample": "8",
            "disposition": {
                "default": 0,
                "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
            }
        },
        {
            "index": 1,
            "codec_name": "aac",
            "codec_long_name": "AAC (Advanced Audio Coding)",
            "profile": "HE-AAC",
            "codec_type": "audio",
            "codec_time_base": "1/48000",
            "codec_tag_string": "[15][0][0][0]",
            "codec_tag": "0x000f",
            "sample_fmt": "fltp",
            "sample_rate": "48000",
            "channels": 2,
            "channel_layout": "stereo",
            "bits_per_sample": 0,
            "id": "0x1e2",
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/90000",
            "start_pts": 4952129377,
            "start_time": "55023.659744",
            "duration_ts": 418560,
            "duration": "4.650667",
            "bit_rate": "63562",
            "disposition": {
                "default": 0,
                "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": "ron"
            }
        }
    ],
    "format": {
        "filename": "a.ts",
        "nb_streams": 2,
        "nb_programs": 1,
        "format_name": "mpegts",
        "format_long_name": "MPEG-TS (MPEG-2 Transport Stream)",
        "start_time": "55023.659744",
        "duration": "7.376000",
        "size": "1180828",
        "bit_rate": "1280724",
        "probe_score": 50
    }
}