
.webm ファイルを mp4 に変換しようとしています。GUI で、変換のために次の設定を選択します。
ビデオ:
- コーデック: H-264
- リスト項目
- ビットレート: 512 kb/s
- フレームレート: 23.97 fps
- スケール: 1
オーディオ:
- コーデック: MPEG 4 オーディオ (AAC)
- ビットレート: 128 kb/s
- チャンネル: 2
- サンプルレート: 44100
そして、それは完璧に機能しました。今度は、すべてのWebMビデオファイルを一括でMP4に変換したいと思いました。そこで、このバッチスクリプトを試しました(主にVLC ウィキページ)
@echo off
FOR /R %%G IN (*.webm) DO (CALL :SUB_VLC "%%G")
GOTO :eof
:SUB_VLC
SET _firstbit=%1
SET _qt="
CALL SET _newnm=%%_firstbit:%_qt%=%%
SET _commanm=%_newnm:,=_COMMA_%
echo %_commanm%
CALL "C:\Program Files (x86)\VideoLAN\VLC\vlc" -I dummy -vvv %1 --sout=#transcode{vcodec="h264", vb="512", fps="23.97", scale="1", acodec="mpga",ab="128","channels=2",samplerate="44100"}:standard{access="file",mux="dummy",dst="%_commanm%.mp4"} vlc://quit
GOTO :eof
:eof
しかし、動作していないようです (つまり、出力が得られません)。代わりに、vlc のダミー ウィンドウに次のメッセージが表示されます。
[023332fc] dummy interface: VLC media player - 1.1.11 The Luggage
[023332fc] dummy interface: Copyright © 1996-2011 the VideoLAN team
[023332fc] dummy interface:
Warning: if you can't access the GUI anymore, open a command-line window, go to
the directory where you installed VLC and run "vlc -I qt"
[023332fc] dummy interface: using the dummy interface module...
[023332fc] main interface debug: using interface module "dummy"
[023332fc] main interface debug: TIMER module_need() : 45.000 ms - Total 45.000
ms / 1 intvls (Avg 45.000 ms)
[02315e04] main playlist debug: rebuilding array of current - root Playlist
[02315e04] main playlist debug: rebuild done - 5 items, index -1
[02315e04] main playlist debug: processing request item null node Playlist skip
0
[02315e04] main playlist debug: starting new item
[02315e04] main playlist debug: creating new input thread
[022ffbe4] main input debug: Creating an input for 'a.webm'
[022ffbe4] main input debug: thread (input) created at priority 1 (../.././src/i
nput/input.c:220)
[022ffbe4] main input debug: thread started
[02343144] main stream output debug: using sout chain=`transcode{vcodec=h264,'
[02343144] main stream output debug: stream=`transcode'
[023400dc] main stream out debug: looking for sout stream module: 1 candidate
[023400dc] stream_out_transcode stream out error: cannot create chain
[023400dc] main stream out debug: no sout stream module matching "transcode" cou
ld be loaded
[023400dc] main stream out debug: TIMER module_need() : 5.000 ms - Total 5.000 m
s / 1 intvls (Avg 5.000 ms)
[023400dc] main stream out debug: destroying chain... (name=(null))
[023400dc] main stream out debug: destroying chain done
[02343144] main stream output error: stream chain failed for `transcode{vcodec=h
264,'
[022ffbe4] main input error: cannot start stream output instance, aborting
[02315e04] main playlist debug: finished input
[022ffbe4] main input debug: thread ended
[02315e04] main playlist debug: dead input
[022ffbe4] main input debug: thread times: real 0m0.015000s, kernel 0m0.000000s,
user 0m0.000000s
[022ffbe4] main input debug: TIMER input launching for 'a.webm' : 15.000 ms - To
tal 15.000 ms / 1 intvls (Avg 15.000 ms)
[02315e04] main playlist debug: changing item without a request (current 0/5)
[02315e04] main playlist debug: using item 1
[02315e04] main playlist debug: starting new item
[02315e04] main playlist debug: creating new input thread
[022ffbe4] main input debug: Creating an input for 'New Folder/vb=512,'
[022ffbe4] main input debug: thread started
[022ffbe4] main input debug: thread (input) created at priority 1 (../.././src/i
nput/input.c:220)
[02343204] main stream output debug: using sout chain=`transcode{vcodec=h264,'
[02343204] main stream output debug: stream=`transcode'
[02340194] main stream out debug: looking for sout stream module: 1 candidate
[02340194] stream_out_transcode stream out error: cannot create chain
[02340194] main stream out debug: no sout stream module matching "transcode" cou
ld be loaded
[02340194] main stream out debug: TIMER module_need() : 5.000 ms - Total 5.000 m
s / 1 intvls (Avg 5.000 ms)
[02340194] main stream out debug: destroying chain... (name=(null))
[02340194] main stream out debug: destroying chain done
[02343204] main stream output error: stream chain failed for `transcode{vcodec=h
264,'
[022ffbe4] main input error: cannot start stream output instance, aborting
[02315e04] main playlist debug: finished input
[022ffbe4] main input debug: thread ended
[02315e04] main playlist debug: dead input
[022ffbe4] main input debug: thread times: real 0m0.030000s, kernel 0m0.000000s,
user 0m0.000000s
[022ffbe4] main input debug: TIMER input launching for 'New Folder/vb=512,' : 30
.000 ms - Total 30.000 ms / 1 intvls (Avg 30.000 ms)
[02315e04] main playlist debug: changing item without a request (current 1/5)
[02315e04] main playlist debug: using item 2
[02315e04] main playlist debug: starting new item
[02315e04] main playlist debug: creating new input thread
[022ffbe4] main input debug: Creating an input for 'New Folder/fps=23.97,'
[022ffbe4] main input debug: thread (input) created at priority 1 (../.././src/i
nput/input.c:220)
[022ffbe4] main input debug: thread started
[02343144] main stream output debug: using sout chain=`transcode{vcodec=h264,'
[02343144] main stream output debug: stream=`transcode'
[02315e04] main playlist debug: meta ok for (null), need to fetch art
[0231871c] main stream out debug: looking for sout stream module: 1 candidate
[02cd3b5c] main demux meta debug: looking for meta fetcher module: 1 candidate
[0231871c] stream_out_transcode stream out error: cannot create chain
[02cd3b5c] lua demux meta debug: Trying Lua scripts in C:\Users\mmz\AppData\Roam
ing\vlc\lua\meta\fetcher
[0231871c] main stream out debug: no sout stream module matching "transcode" cou
ld be loaded
[02cd3b5c] lua demux meta debug: Trying Lua scripts in C:\Program Files (x86)\Vi
deoLAN\VLC\lua\meta\fetcher
[0231871c] main stream out debug: TIMER module_need() : 0.000 ms - Total 0.000 m
s / 1 intvls (Avg 0.000 ms)
[0231871c] main stream out debug: destroying chain... (name=(null))
[02cd3b5c] lua demux meta debug: Trying Lua playlist script C:\Program Files (x8
6)\VideoLAN\VLC\lua\meta\fetcher\tvrage.lua
[0231871c] main stream out debug: destroying chain done
[02343144] main stream output error: stream chain failed for `transcode{vcodec=h
264,'
[02cd3b5c] main demux meta debug: using meta fetcher module "lua"
[022ffbe4] main input error: cannot start stream output instance, aborting
[02315e04] main playlist debug: finished input
[02cd3b5c] main demux meta debug: TIMER module_need() : 5.000 ms - Total 5.000 m
s / 1 intvls (Avg 5.000 ms)
[022ffbe4] main input debug: thread ended
[02315e04] main playlist debug: dead input
[02cd3b5c] main demux meta debug: removing module "lua"
[022ffbe4] main input debug: thread times: real 0m0.010000s, kernel 0m0.000000s,
user 0m0.000000s
[02315e04] main playlist debug: searching art for a.webm
[022ffbe4] main input debug: TIMER input launching for 'New Folder/fps=23.97,' :
15.000 ms - Total 15.000 ms / 1 intvls (Avg 15.000 ms)
[02315e04] main playlist debug: changing item without a request (current 2/5)
[022c74d4] main art finder debug: looking for art finder module: 2 candidates
[02315e04] main playlist debug: using item 3
[022c74d4] lua art finder debug: Trying Lua scripts in C:\Users\mmz\AppData\Roam
ing\vlc\lua\meta\art
[02315e04] main playlist debug: starting new item
[022c74d4] lua art finder debug: Trying Lua scripts in C:\Program Files (x86)\Vi
deoLAN\VLC\lua\meta\art
[02315e04] main playlist debug: creating new input thread
[022c74d4] lua art finder debug: Trying Lua playlist script C:\Program Files (x8
6)\VideoLAN\VLC\lua\meta\art\01_googleimage.lua
[022ffbe4] main input debug: Creating an input for 'New Folder/scale=1,'
[022c74d4] lua art finder debug: Trying Lua playlist script C:\Program Files (x8
6)\VideoLAN\VLC\lua\meta\art\02_frenchtv.lua
[022ffbe4] main input debug: thread (input) created at priority 1 (../.././src/i
nput/input.c:220)
[022ffbe4] main input debug: thread started
[022c74d4] lua art finder debug: Trying Lua playlist script C:\Program Files (x8
6)\VideoLAN\VLC\lua\meta\art\03_lastfm.lua
[02ca2f6c] main stream output debug: using sout chain=`transcode{vcodec=h264,'
[02ca2f6c] main stream output debug: stream=`transcode'
[022c74d4] lua art finder debug: Trying Lua playlist script C:\Program Files (x8
6)\VideoLAN\VLC\lua\meta\art\04_musicbrainz.lua
[023187d4] main stream out debug: looking for sout stream module: 1 candidate
[023187d4] stream_out_transcode stream out error: cannot create chain
[022c74d4] main art finder debug: no art finder module matching "any" could be l
oaded
[023187d4] main stream out debug: no sout stream module matching "transcode" cou
ld be loaded
[022c74d4] main art finder debug: TIMER module_need() : 10.000 ms - Total 10.000
ms / 1 intvls (Avg 10.000 ms)
[02315e04] main playlist debug: art not found for a.webm
[023187d4] main stream out debug: TIMER module_need() : 10.000 ms - Total 10.000
ms / 1 intvls (Avg 10.000 ms)
[023187d4] main stream out debug: destroying chain... (name=(null))
[023187d4] main stream out debug: destroying chain done
[02ca2f6c] main stream output error: stream chain failed for `transcode{vcodec=h
264,'
[022ffbe4] main input error: cannot start stream output instance, aborting
[02315e04] main playlist debug: finished input
[022ffbe4] main input debug: thread ended
[02315e04] main playlist debug: dead input
[022ffbe4] main input debug: thread times: real 0m0.015000s, kernel 0m0.000000s,
user 0m0.015600s
[022ffbe4] main input debug: TIMER input launching for 'New Folder/scale=1,' : 1
5.000 ms - Total 15.000 ms / 1 intvls (Avg 15.000 ms)
[02315e04] main playlist debug: changing item without a request (current 3/5)
[02315e04] main playlist debug: using item 4
[02315e04] main playlist debug: starting new item
[02315e04] main playlist debug: creating new input thread
[022ffbe4] main input debug: Creating an input for 'a.webm.mp4}'
[022ffbe4] main input debug: thread (input) created at priority 1 (../.././src/i
nput/input.c:220)
[022ffbe4] main input debug: thread started
[02ca302c] main stream output debug: using sout chain=`transcode{vcodec=h264,'
[02ca302c] main stream output debug: stream=`transcode'
[02cc8c24] main stream out debug: looking for sout stream module: 1 candidate
[02cc8c24] stream_out_transcode stream out error: cannot create chain
[02cc8c24] main stream out debug: no sout stream module matching "transcode" cou
ld be loaded
[02cc8c24] main stream out debug: TIMER module_need() : 0.000 ms - Total 0.000 m
s / 1 intvls (Avg 0.000 ms)
[02cc8c24] main stream out debug: destroying chain... (name=(null))
[02cc8c24] main stream out debug: destroying chain done
[02ca302c] main stream output error: stream chain failed for `transcode{vcodec=h
264,'
[022ffbe4] main input error: cannot start stream output instance, aborting
[02315e04] main playlist debug: finished input
[022ffbe4] main input debug: thread ended
[02315e04] main playlist debug: dead input
[022ffbe4] main input debug: thread times: real 0m0.015000s, kernel 0m0.015600s,
user 0m0.000000s
[022ffbe4] main input debug: TIMER input launching for 'a.webm.mp4}' : 15.000 ms
- Total 15.000 ms / 1 intvls (Avg 15.000 ms)
[02315e04] main playlist debug: changing item without a request (current 4/5)
[02315e04] main playlist debug: nothing to play
何が間違っているのでしょうか?
答え1
私は自分のコメントから回答を作成していますが、それがあなたの問題の原因であると思います。
スクリプトでは
CALL "C:\Program Files (x86)\VideoLAN\VLC\vlc" -I dummy -vvv %1 --sout=#transcode{vcodec="h264", vb="512", fps="23.97", scale="1", acodec="mpga",ab="128","channels=2",samplerate="44100"}:standard{access="file",mux="dummy",dst="%_commanm%.mp4"} vlc://quit
そしてエラーが表示される
main stream output error: stream chain failed for `transcode{vcodec=h264,'
このことから、パーサーはすべての空白 (スペース、タブなど) を切り取るため、コマンドを理解できないという結論に至りました。VLC wiki へのリンクにも空白はありません。
次の行を試してください:
CALL "C:\Program Files (x86)\VideoLAN\VLC\vlc" -I dummy -vvv %1 --sout=#transcode{vcodec="h264",vb="512",fps="23.97",scale="1",acodec="mpga",ab="128","channels=2",samplerate="44100"}:standard{access="file",mux="dummy",dst="%_commanm%.mp4"} vlc://quit
なぜ VLC はそれらの愚かな空白文字に対処できないのかと疑問に思うかもしれません (実際には対処できます ;) )
プログラムが OS によって呼び出されて実行される場合 (Linux の場合しか確実に知りませんが、Windows でも同様に処理されるはずです)、コマンドのパラメータはオペレーティング システムによって (スペースで) 分割され、スペース間のコンテンツのみを含むリストとしてプログラムに渡されます。
したがって、リスト内のすべての個々のエントリを認識して読み取り、それらを再び結合するのはプログラムの仕事になります。これは確かに可能ですが、ソフトウェアの開発時とパラメータの評価時の両方で時間がかかります。
答え2
私のカムコーダの.modファイルを.m4vに変換するには、Linuxでこのスクリプトを書きました。
#!/bin/sh
NAME=`echo "$1" | cut -d'.' -f1`
vlc $1 -I dummy --play-and-exit --sout='#transcode{vcodec=h264,acodec=mp4a,ab=128,samplerate=44100,deinterlace,audio-sync}:std{access=file, mux=mp4,dst=./'"$NAME"'.m4v}
名前を付けてmod2h264.sh
実行可能にしました。
次にコマンドラインで次のように入力します。
for file in *.MOD; do ~/MyScripts/mod2h264.sh "$file"; done
現在のディレクトリ内のすべての .MOD ファイルを変換します。希望する出力に合わせてオプションを調整できます。