Estrarre e salvare soltanto l'audio da un file video mediante il Componente gb.media
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Versione del 25 lug 2024 alle 06:13 di Vuott (Discussione | contributi)
Mostriamo alcuni esempi pratici per estrarre soltanto l'audio da un file video e salvarlo in un file audio.
Indice
Salvare l'audio in un file di formato WAV
Private pl As MediaPipeline Private bo As Boolean Public Sub Main() Dim src, bin, con, wav, snk As MediaControl Dim filevideo As String pl = New MediaPipeline As "PLine" filevideo = "/percorso/del/file/video" src = New MediaControl(pl, "filesrc") src["location"] = filevideo bin = New MediaControl(pl, "decodebin") con = New MediaControl(pl, "audioconvert") wav = New MediaControl(pl, "wavenc") snk = New MediaControl(pl, "filesink") snk["location"] = "/tmp/audio.wav" src.LinkTo(bin) bin.LinkLaterTo(con) con.LinkTo(wav) wav.LinkTo(snk) pl.Play() While pl.Duration < 1 Wait 0.01 Wend Print "Durata dell'audio: "; Str(Time(0, 0, 0, pl.Duration * 1000)) While Not bo Wait 0.01 Wend pl.Close Quit End Public Sub PLine_Position() If pl.Position >= 1.0 Then Write "\rTempo trascorso: " & Str(Time(0, 0, 0, pl.Position * 1000)) Flush Endif End Public Sub PLine_End() ' Questo Evento viene sollevato, quando l'estrazione è terminata Print "\nEstrazione audio terminata !" bo = True End
Salvare l'audio in un file di formato MP3
Private pl As MediaPipeline Private bo As Boolean Public Sub Main() Dim src, bin, con, mp3, snk As MediaControl Dim filevideo As String pl = New MediaPipeline As "PLine" filevideo = "/percorso/del/file/video" src = New MediaControl(pl, "filesrc") src["location"] = filevideo bin = New MediaControl(pl, "decodebin") con = New MediaControl(pl, "audioconvert") mp3 = New MediaControl(pl, "lamemp3enc") snk = New MediaControl(pl, "filesink") snk["location"] = "/tmp/audio.mp3" src.LinkTo(bin) bin.LinkLaterTo(con) con.LinkTo(mp3) mp3.LinkTo(snk) pl.Play() Print "Durata dell'audio: "; Str(Time(0, 0, 0, pl.Duration * 1000)) While Not bo Wait 0.01 Wend pl.Close Quit End Public Sub PLine_Position() If pl.Position >= 1.0 Then Write "\rTempo trascorso: " & Str(Time(0, 0, 0, pl.Position * 1000)) Flush Endif End Public Sub PLine_End() ' Questo Evento viene sollevato, quando l'estrazione è terminata Print "\nEstrazione audio terminata !" bo = True End
Salvare l'audio in un file di formato OGG
Private pl As MediaPipeline Private bo As Boolean Public Sub Main() Dim src, bin, con, vor, ogg, snk As MediaControl Dim filevideo As String pl = New MediaPipeline As "PLine" filevideo = "/percorso/del/file/video" src = New MediaControl(pl, "filesrc") src["location"] = filevideo bin = New MediaControl(pl, "decodebin") con = New MediaControl(pl, "audioconvert") vor = New MediaControl(pl, "vorbisenc") ogg = New MediaControl(pl, "oggmux") snk = New MediaControl(pl, "filesink") snk["location"] = "/tmp/audio.ogg" src.LinkTo(bin) bin.LinkLaterTo(con) con.LinkTo(vor) vor.LinkTo(ogg) ogg.LinkTo(snk) pl.Play() While pl.Duration < 1 Wait 0.01 Wend Print "Durata dell'audio: "; Str(Time(0, 0, 0, pl.Duration * 1000)) While Not bo Wait 0.01 Wend pl.Close Quit End Public Sub PLine_Position() ' Mostra il tempo trascorso dall'avvio del video: If pl.Position >= 1.0 Then Write "\rTempo trascorso: " & Str(Time(0, 0, 0, pl.Position * 1000)) Flush Endif End Public Sub PLine_End() ' Questo Evento viene sollevato, quando l'estrazione è terminata Print "\nEstrazione audio terminata !" bo = True End
Salvare l'audio in un file di formato RAW
Private pl As MediaPipeline Private bo As Boolean Public Sub Main() Dim src, bin, con, snk As MediaControl Dim flt As MediaFilter Dim filevideo As String pl = New MediaPipeline As "PLine" filevideo = "/percorso/del/file/video" src = New MediaControl(pl, "filesrc") src["location"] = filevideo bin = New MediaControl(pl, "decodebin") con = New MediaControl(pl, "audioconvert") flt = New MediaFilter(pl, "audio/x-raw, format=S16LE, channels=2, endianness=1234, width=16, depth=16") snk = New MediaControl(pl, "filesink") snk["location"] = "/tmp/audio.raw" src.LinkTo(bin) bin.LinkLaterTo(con) con.LinkTo(flt) flt.LinkTo(snk) pl.Play() While pl.Duration < 1 Wait 0.01 Wend Print "Durata dell'audio: "; Str(Time(0, 0, 0, pl.Duration * 1000)) While Not bo Wait 0.01 Wend pl.Close Quit End Public Sub PLine_Position() If pl.Position >= 1.0 Then Write "\rTempo trascorso: " & Str(Time(0, 0, 0, pl.Position * 1000)) Flush Endif End Public Sub PLine_End() ' Questo Evento viene sollevato, quando l'estrazione è terminata Print "\nEstrazione audio terminata !" bo = True End
Salvare l'audio in un file di formato AAC
Private Const GST_AUDIO_FORMAT_S16LE As Integer = 4 Private pl As MediaPipeline Private bo As Boolean Public Sub Main() Dim src, bin, con, raw, aac, snk As MediaControl Dim flt1, flt2 As MediaFilter Dim filevideo As String pl = New MediaPipeline As "PLine" filevideo = "/percorso/del/file/video" src = New MediaControl(pl, "filesrc") src["location"] = filevideo bin = New MediaControl(pl, "decodebin") con = New MediaControl(pl, "audioconvert") src = New MediaControl(pl, "filesrc") src["location"] = filevideo bin = New MediaControl(pl, "decodebin") con = New MediaControl(pl, "audioconvert") flt1 = New MediaFilter(pl, "audio/x-raw, format=S16LE, rate=44100, channels=2, endianness=1234, width=16, depth=16") raw = New MediaControl(pl, "rawaudioparse") raw["interleaved"] = True raw["num-channels"] = 2 raw["pcm-format"] = GST_AUDIO_FORMAT_S16LE raw["sample-rate"] = 44100 aac = New MediaControl(pl, "faac") ' oppure anche "voaacenc" flt2 = New MediaFilter(pl, "audio/mpeg,stream-format=adts,channels=2,rate=44100") snk = New MediaControl(pl, "filesink") snk["location"] = "/tmp/file.aac" src.LinkTo(bin) bin.LinkLaterTo(con) con.LinkTo(flt1) flt1.LinkTo(raw) raw.LinkTo(aac) aac.LinkTo(flt2) flt2.LinkTo(snk) pl.Play() While pl.Duration < 1 Wait 0.01 Wend Print "Durata dell'audio: "; Str(Time(0, 0, 0, pl.Duration * 1000)) While Not bo Wait 0.01 Wend pl.Close Quit End Public Sub PLine_Position() If pl.Position >= 1.0 Then Write "\rTempo trascorso: " & Str(Time(0, 0, 0, pl.Position * 1000)) Flush Endif End Public Sub PLine_End() ' Questo Evento viene sollevato, quando l'estrazione è terminata Print "\nEstrazione audio terminata !" bo = True End