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• Converting `webm` to `mov` format using ffmpeg loses transparency - how can I keep it ?

  10 mars 2023, par M.A Shahbazi

  I am trying to convert a webm video to mov format without losing quality and transparency using the following command :

  


  ffmpeg -c:v libvpx-vp9 -i input.webm ouput.mov


  


  The video gets converted, but it loses transparency and the background of video is black.

  


  I also tried the following command :

  


  ffmpeg -c:v png -i input.webm output.mov


  


  But it gives me the following error output :

  


    libavutil      58.  3.100 / 58.  3.100
  libavcodec     60.  4.100 / 60.  4.100
  libavformat    60.  4.100 / 60.  4.100
  libavdevice    60.  2.100 / 60.  2.100
  libavfilter     9.  4.100 /  9.  4.100
  libswscale      7.  2.100 /  7.  2.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
[png @ 0000028041ca7000] Invalid PNG signature 0x824983420031F031.
[matroska,webm @ 0000028041c91240] Could not find codec parameters for stream 0 (Video: png, none(pc, progressive), 800x800): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, matroska,webm, from 'hero.webm':
  Metadata:
    COMPATIBLE_BRANDS: qt
    creation_time   : 2023-02-23T10:43:46.703800Z
    MAJOR_BRAND     : qt
    MINOR_VERSION   : 537199360
    ENCODER         : Lavf59.35.100
  Duration: 00:00:09.00, start: 0.000000, bitrate: 1378 kb/s
  Stream #0:0: Video: png, none(pc, progressive), 800x800, SAR 1:1 DAR 1:1, 24 fps, 24 tbr, 1k tbn
    Metadata:
      alpha_mode      : 1
      ENCODER         : Lavc59.56.100 libvpx-vp9
      DURATION        : 00:00:09.000000000
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[png @ 0000028041ca7680] Invalid PNG signature 0x824983420031F031.
Error while decoding stream #0:0: Invalid data found when processing input
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished
Conversion failed!


  


  How can I maintain transparency when converting from webm to mov format ?

  


  Here's the video info in case it can be helpful :

  


  {
    "streams": [
        {
            "index": 0,
            "codec_name": "vp9",
            "codec_long_name": "Google VP9",
            "profile": "Profile 0",
            "codec_type": "video",
            "codec_tag_string": "[0][0][0][0]",
            "codec_tag": "0x0000",
            "width": 800,
            "height": 800,
            "coded_width": 800,
            "coded_height": 800,
            "closed_captions": 0,
            "film_grain": 0,
            "has_b_frames": 0,
            "sample_aspect_ratio": "1:1",
            "display_aspect_ratio": "1:1",
            "pix_fmt": "yuv420p",
            "level": -99,
            "color_range": "tv",
            "field_order": "progressive",
            "refs": 1,
            "r_frame_rate": "24/1",
            "avg_frame_rate": "24/1",
            "time_base": "1/1000",
            "start_pts": 0,
            "start_time": "0.000000",
            "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,
                "captions": 0,
                "descriptions": 0,
                "metadata": 0,
                "dependent": 0,
                "still_image": 0
            },
            "tags": {
                "alpha_mode": "1",
                "ENCODER": "Lavc59.56.100 libvpx-vp9",
                "DURATION": "00:00:09.000000000"
            }
        }
    ],
    "format": {
        "filename": ".\\hero.webm",
        "nb_streams": 1,
        "nb_programs": 0,
        "format_name": "matroska,webm",
        "format_long_name": "Matroska / WebM",
        "start_time": "0.000000",
        "duration": "9.000000",
        "size": "1550466",
        "bit_rate": "1378192",
        "probe_score": 100,
        "tags": {
            "COMPATIBLE_BRANDS": "qt  ",
            "creation_time": "2023-02-23T10:43:46.703800Z",
            "MAJOR_BRAND": "qt  ",
            "MINOR_VERSION": "537199360",
            "ENCODER": "Lavf59.35.100"
        }
    }
}


  


• Why is audio bitrate value of ffprobe output higher ?

  9 mars 2023, par 19xlr95

  When I check audio bitrate of my video via OS file details, media players or ffprobe -i my_video.mp4, I get the bitrate is 128 kbps. And I want to get more detailed meta information of the video by ffprobe -loglevel 0 -print_format json -show_format -show_streams my_video.mp4. However audio bitrate value of the output is 128615 bps.

  


  I thought it should be 128000 not 128615. Or 128 x 1024 = 131072. I wonder why it is not one of the values that I assumed. Also how can I safely say that this 128615 bps is 128 kbps ?

  


  Below is the detailed meta information for my video.

  


  {
    "streams": [
        {
            "index": 0,
            "codec_name": "aac",
            "codec_long_name": "AAC (Advanced Audio Coding)",
            "profile": "LC",
            "codec_type": "audio",
            "codec_tag_string": "mp4a",
            "codec_tag": "0x6134706d",
            "sample_fmt": "fltp",
            "sample_rate": "48000",
            "channels": 2,
            "channel_layout": "stereo",
            "bits_per_sample": 0,
            "initial_padding": 0,
            "id": "0x1",
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/48000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 965760,
            "duration": "20.120000",
            "bit_rate": "128615",
            "nb_frames": "946",
            "extradata_size": 2,
            "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,
                "captions": 0,
                "descriptions": 0,
                "metadata": 0,
                "dependent": 0,
                "still_image": 0
            },
            "tags": {
                "creation_time": "2023-02-20T09:00:58.000000Z",
                "language": "deu",
                "handler_name": "Core Media Audio",
                "vendor_id": "[0][0][0][0]"
            }
        },
        {
            "index": 1,
            "codec_name": "h264",
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
            "profile": "High",
            "codec_type": "video",
            "codec_tag_string": "avc1",
            "codec_tag": "0x31637661",
            "width": 1080,
            "height": 1920,
            "coded_width": 1080,
            "coded_height": 1920,
            "closed_captions": 0,
            "film_grain": 0,
            "has_b_frames": 0,
            "sample_aspect_ratio": "1:1",
            "display_aspect_ratio": "9:16",
            "pix_fmt": "yuv420p",
            "level": 42,
            "color_range": "tv",
            "color_space": "bt709",
            "color_transfer": "bt709",
            "color_primaries": "bt709",
            "chroma_location": "left",
            "field_order": "progressive",
            "refs": 1,
            "is_avc": "true",
            "nal_length_size": "4",
            "id": "0x2",
            "r_frame_rate": "50/1",
            "avg_frame_rate": "50/1",
            "time_base": "1/50000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 1006000,
            "duration": "20.120000",
            "bit_rate": "20958903",
            "bits_per_raw_sample": "8",
            "nb_frames": "1006",
            "extradata_size": 35,
            "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,
                "captions": 0,
                "descriptions": 0,
                "metadata": 0,
                "dependent": 0,
                "still_image": 0
            },
            "tags": {
                "creation_time": "2023-02-20T09:00:58.000000Z",
                "language": "und",
                "handler_name": "Core Media Video",
                "vendor_id": "[0][0][0][0]"
            }
        }
    ],
    "format": {
        "filename": "my_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": "20.120000",
        "size": "53309460",
        "bit_rate": "21196604",
        "probe_score": 100,
        "tags": {
            "major_brand": "mp42",
            "minor_version": "1",
            "compatible_brands": "isommp41mp42",
            "creation_time": "2023-02-20T09:00:58.000000Z"
        }
    }
}


  


  I checked 1 kbps is 1000 bps and assumed 128 kbps of the audio bitrate should be 128000 bps. But it is 128615 bps when I run ffprobe.

  


• Invalid frame dimension, invalid data found when processing input, muxing overhead : unknown when concatting old VOB files | FFMPEG

  9 mars 2023, par Victor Hartman

  I am dealing with multiple errors which I am not able to resolve. I am trying to concat 4 old VOB files to a mp4. Using command (already solved a 'pts has no value error') :

  


  .\ffmpeg.exe -fflags +genpts -f concat -i .\files.txt -c copy output.mp4


  


  files.txt looks like this :

  


  file 'VTS_01_1.VOB'
file 'VTS_01_2.VOB'
file 'VTS_01_3.VOB'
file 'VTS_01_4.VOB'


  


  Output looks like this :

  


  ffmpeg version 2023-03-05-git-912ac82a3c-essentials_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      58.  3.100 / 58.  3.100
  libavcodec     60.  6.100 / 60.  6.100
  libavformat    60.  4.100 / 60.  4.100
  libavdevice    60.  2.100 / 60.  2.100
  libavfilter     9.  4.100 /  9.  4.100
  libswscale      7.  2.100 /  7.  2.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
Input #0, concat, from '.\files.txt':
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Data: dvd_nav_packet
  Stream #0:1: Video: mpeg2video (Main), yuv420p(tv, top first), 720x480 [SAR 8:9 DAR 4:3], 29.97 fps, 29.97 tbr, 90k tbn
    Side data:
      cpb: bitrate max/min/avg: 7000000/0/0 buffer size: 1835008 vbv_delay: N/A
  Stream #0:2: Audio: ac3, 48000 Hz, stereo, fltp, 448 kb/s
File 'output.mp4' already exists. Overwrite? [y/N] y
[mp4 @ 00000211b44d0900] track 1: codec frame size is not set
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf60.4.100
  Stream #0:0: Video: mpeg2video (Main) (mp4v / 0x7634706D), yuv420p(tv, top first), 720x480 [SAR 8:9 DAR 4:3], q=2-31, 29.97 fps, 29.97 tbr, 90k tbn
    Side data:
      cpb: bitrate max/min/avg: 7000000/0/0 buffer size: 1835008 vbv_delay: N/A
  Stream #0:1: Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 448 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)
Press [q] to stop, [?] for help
[mpeg2video @ 00000211b44a5f00] Invalid frame dimensions 0x0. bitrate=5521.6kbits/s speed= 643x
    Last message repeated 3 times
[concat @ 00000211b449b500] DTS 137507370 < 137525388 out of order
[mp4 @ 00000211b44d0900] Non-monotonous DTS in output stream 0:0; previous: 137525388, current: 137507370; changing to 137525389. This may result in incorrect timestamps in the output file.
[mp4 @ 00000211b44d0900] Non-monotonous DTS in output stream 0:0; previous: 137525389, current: 137510250; changing to 137525390. This may result in incorrect timestamps in the output file.
[mp4 @ 00000211b44d0900] Non-monotonous DTS in output stream 0:0; previous: 137525390, current: 137510250; changing to 137525391. This may result in incorrect timestamps in the output file.
[mp4 @ 00000211b44d0900] Non-monotonous DTS in output stream 0:0; previous: 137525391, current: 137513130; changing to 137525392. This may result in incorrect timestamps in the output file.
[mp4 @ 00000211b44d0900] Non-monotonous DTS in output stream 0:0; previous: 137525392, current: 137516010; changing to 137525393. This may result in incorrect timestamps in the output file.
[mp4 @ 00000211b44d0900] Non-monotonous DTS in output stream 0:0; previous: 137525393, current: 137518890; changing to 137525394. This may result in incorrect timestamps in the output file.
[mp4 @ 00000211b44d0900] Non-monotonous DTS in output stream 0:0; previous: 137525394, current: 137521770; changing to 137525395. This may result in incorrect timestamps in the output file.
[mp4 @ 00000211b44d0900] Non-monotonous DTS in output stream 0:0; previous: 137525395, current: 137524650; changing to 137525396. This may result in incorrect timestamps in the output file.
av_interleaved_write_frame(): Invalid data found when processing input
[out#0/mp4 @ 00000211b44f96c0] Error muxing a packet
[out#0/mp4 @ 00000211b44f96c0] Error writing trailer: Invalid data found when processing input
frame=45815 fps=19808 q=-1.0 Lsize= 1027328kB time=00:25:29.51 bitrate=5502.3kbits/s speed= 661x
video:943791kB audio:83556kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Conversion failed!