WEBM to Final Cut Pro (FCP)

WEBM is not supported by FCP. Some webm files are required to import to FCP for editing, and I don't want to install any software. Thanks to ffmpeg, it is just one command line away.

1. Inspect webm file

% ffmpeg -i myfile.webm

Input #0, matroska,webm, from 'myfile.webm':

  Metadata:

    HTTP://YOUTUBE.COM/STREAMING/OTF/DURATIONS/112015: Segment-Count: 689

                    : Segment-Durations-Ms: 5120(r=687),3760,

                    :

                    :

    ENCODER         : Lavf58.29.100

  Duration: 00:58:46.38, start: -0.007000, bitrate: 260 kb/s

    Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709/unknown/unknown), 320x218, SAR 1:1 DAR 160:109, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)

    Metadata:

      DURATION        : 00:58:46.320000000

    Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)

    Metadata:

      DURATION        : 00:58:46.381000000

At least one output file must be specified

2. convert webm file to mov

% ffmpeg -i 1.webm -c:v libx265 -tag:v hvc1 -c:a pcm_s24le -f mov -movflags +faststart 1.webm.mov

3. Inspect mov file

% ffmpeg -i 1.webm.mov

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.webm.mov':

  Metadata:

    major_brand     : qt

    minor_version   : 512

    compatible_brands: qt

    encoder         : Lavf58.29.100

  Duration: 00:59:29.40, start: 0.000000, bitrate: 2357 kb/s

    Stream #0:0(eng): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, progressive), 320x240 [SAR 1:1 DAR 4:3], 51 kb/s, 12 fps, 12 tbr, 12288 tbn, 12 tbc (default)

    Metadata:

      handler_name    : VideoHandler

      encoder         : Lavc58.54.100 libx265

    Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)

    Metadata:

      handler_name    : SoundHandler

4. Import into FCP.