st：1編集リスト：1 ffmpegで生成されたファイルからタイムスタンプを検索するときに欠落しているキーフレーム：0

私はmp4でconcatを使って新しいmp4ファイルを作成しました。

ffmpeg -protocol_whitelist file,tcp,http,pipe -f concat -i - -c copy ${videoName%/}.mp4

その後、新しく作成されたファイルのファイルサイズを次のように小さくしたいと思います。

ffmpeg -i "$file" -s 1280x720 -c:a copy "$videoName"

しかし、私は見た

hutber@hutber:/mnt/googledrive/Winchmore Hill/1920/Week_14_6-2_W/Clips$ sd
Gtk-Message: 12:18:37.761: GtkDialog mapped without a transient parent. This is discouraged.
/mnt/googledrive/Winchmore Hill/1920/Week_14_6-2_W/Clips/vlc-record-2020-01-25-20h28m06s-S3510003.MP4-.mp4
/mnt/googledrive/Winchmore Hill/1920/Week_14_6-2_W/Clips/01.26.2020/vlc-record-2020-01-25-20h28m06s-S3510003.MP4-_01.26.2020_12.18_SD.mp4
ffmpeg version N-49161-g50e194e6e1-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg
  libavutil      56. 30.100 / 56. 30.100
  libavcodec     58. 53.101 / 58. 53.101
  libavformat    58. 28.101 / 58. 28.101
  libavdevice    58.  7.100 / 58.  7.100
  libavfilter     7. 55.100 /  7. 55.100
  libswscale      5.  4.101 /  5.  4.101
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x6844880] st: 1 edit list: 1 Missing key frame while searching for timestamp: 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x6844880] st: 1 edit list 1 Cannot find an index entry before timestamp: 0.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/mnt/googledrive/Winchmore Hill/1920/Week_14_6-2_W/Clips/vlc-record-2020-01-25-20h28m06s-S3510003.MP4-.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: mp41avc1
    creation_time   : 2020-01-25T20:28:19.000000Z
    playback_requirements: QuickTime 6.0 or greater
    playback_requirements-eng: QuickTime 6.0 or greater
    encoder         : vlc 3.0.8 stream output
    encoder-eng     : vlc 3.0.8 stream output
  Duration: 00:00:12.60, start: 0.000000, bitrate: 61318 kb/s
    Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 253 kb/s (default)
    Metadata:
      creation_time   : 2020-01-25T20:28:19.000000Z
      handler_name    : SoundHandler
    Stream #0:1(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 61056 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2020-01-25T20:28:19.000000Z
      handler_name    : VideoHandler
/mnt/googledrive/Winchmore Hill/1920/Week_14_6-2_W/Clips/01.26.2020/vlc-record-2020-01-25-20h28m06s-S3510003.MP4-_01.26.2020_12.18_SD.mp4: No such file or directory

これが役に立つ場合に備えて、ここに私のshスクリプトがあります。 （私はJS開発者がいます：p）

#!/bin/bash
file=$(zenity --file-selection)
currentDateTime=$(date +'%m.%d.%Y_%H.%M')
currentDate=$(date +'%m.%d.%Y')
safeVideoName="${file/ /_}"
safeVideoName="${file/.mp4/}"
safeVideoName="${file/.mp4/}"
filename=${safeVideoName##*/}

fullpath="${safeVideoName%/*}/$currentDate"
videoName="${fullpath}/${filename}_${currentDateTime}_SD.mp4"
echo $file
echo $videoName
mkdir -p $fullpath
ffmpeg -i "$file" -s 1280x720 -c:a copy "$videoName"