shell - 合并视频和音频后如何删除下载的视频文件？

Question

我使用 youtube-dl 从 youtube 下载了 1080p 视频。下载了视频文件 (.f137.mp4) 和音频文件 (f140.m4a)。他们 ffmpeg 将视频文件和音频文件合并为 mp4 文件(.mp4)。我想保留 .f140.m4a 文件和 .mp4 文件，同时删除 f137.mp4 文件。我能怎么做？

我在 youtube-dl 中尝试了 --exec 选项，但它失败了。

这些是我的命令:

root@OMV:~/youtube-dl# cat dl-test.sh
DL_DIR="/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007"
ALBUM="Test"
mkdir -p "$DL_DIR/$ALBUM"
youtube-dl --batch-file  /root/youtube-dl/url-test.list --download-archive /root/youtube-dl/archive-test.list                           \
-f  'bestvideo[ext=mp4]+bestaudio[ext=m4a]/bestvideo+bestaudio'                                 \
--write-sub --embed-sub --all-subs                                                              \
--embed-thumbnail --add-metadata                                                                \
-o "$DL_DIR/$ALBUM/%(title)s.%(ext)s"                                                           \
--exec "rm "$(ls {} | cut -d . -f1)""

结果是:

root@OMV:~/youtube-dl# ./dl-test.sh
ls: cannot access '{}': No such file or directory
...
[ffmpeg] Merging formats into "/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test/UpTown Spot.mp4"
...
[atomicparsley] Adding thumbnail to "/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test/UpTown Spot.mp4"
[exec] Executing command: rm  '/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test/UpTown Spot.mp4'

.mp4 文件被删除，.f137.mp4 文件仍然存在。我得到了相反的结果。

root@OMV:~/youtube-dl# ls '/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test'
UpTown Spot.f137.mp4  UpTown Spot.f140.m4a

更新 1:
我改为

--exec "rm "$(ls {} -1 | sed -n '/\.f[0-9]*\.mp4$/p')""

它仍然删除 .mp4 文件。输出是:

root@OMV:~/youtube-dl# echo "" > "/root/youtube-dl/archive-test.list"
root@OMV:~/youtube-dl# ./dl-test.sh
ls: cannot access '{}': No such file or directory
...
[download] /srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test/UpTown Spot.mp4 has already been downloaded and merged
...
[exec] Executing command: rm  '/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test/UpTown Spot.mp4'

然后改成:

--exec "rm "$(ls -1 | sed -n '/\.f[0-9]*\.mp4$/p')""

输出几乎相同:

root@OMV:~/youtube-dl# ./dl-test.sh
...
[exec] Executing command: rm  '/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test/UpTown Spot.mp4'

我在 SHELL 中测试了正常的表达式，它起作用了:

root@OMV:~/youtube-dl# cd /srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test
root@OMV:/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test# ls "$(ls  /srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test | sed -n '/\.f[0-9]*\.mp4$/p')"
UpTown Spot.f137.mp4
root@OMV:/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test# rm "$(ls  /srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test | sed -n '/\.f[0-9]*\.mp4$/p')"

但是在 youtube-dl --exec 选项中运行的类似命令失败了!

更新 2:
管道后的 cmd 似乎不会被执行。

root@OMV:~/youtube-dl# ./dl-test.sh
+ DL_DIR=/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007
+ ALBUM=Test
+ mkdir -p /srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test
+ youtube-dl --batch-file /root/youtube-dl/url-test.list --download-archive /root/youtube-dl/archive-test.list -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/bestvideo+bestaudio' --write-sub --embed-sub --all-subs --embed-thumbnail --add-metadata -o '/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test/%(title)s.%(ext)s' --exec 'ls | grep mp4'
...
[exec] Executing command: ls | grep mp4 '/srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test/UpTown Spot.mp4'
Binary file /srv/dev-disk-by-id-ata-QEMU_HARDDISK_QM00007/Test/UpTown Spot.mp4 matches
ls: write error: Broken pipe

Answer 1

尝试这个:

改变

$(ls {} | cut -d . -f1)

至

$(ls -1 {} | sed -n '/\.f[0-9]*\.mp4$/p')

解释

ls -1      # print every file in one line

sed -n     # suppress automatic output
'/\.       # pattern start with .
f          # followed by f
[0-9]*     # some numbers
\.mp4$     # and .mp4
/p'        # print line