I wonder why VirtualDub finds it so difficult to merge the streams together.
Mp3 encoding Offline#
It's still almost twice as long as an offline conversion, but a far cry from the 11x slow down.
Mp3 encoding full#
How long does it take if you do direct stream copy for video and full processing for audio? How long does it take to perform Save WAV instead of Save AVI? I suspect this should be normal as Microsoft's internal MP3 codec (straight from Fraunhofer) is only a decoder and not an encoder. The format list is empty, even with the "Show all formats" checked.
What happens if you choose mpeg layer-3 128 kBit/s, 44100 Hz instead of lame?Ĭan't. (This is really a question for the makers of DivX-I'm not privy to what they do behind the scenes. It's 352x240, but it's already a DivX stream, so I guess the encoder is just repacking data the most part. Oh, and the wave file is also 44.1 kHz stereo, so it's not like I'm inadvertently resampling the audio, not that that would justify the 11x slowdown even if I were.ģ minutes? That seems very quick to encode ~50 minutes of video. the same AVS file (using the same video compression/settings in VDub) takes 15 minutes to convert.Ĭonverting the wave file offline (with lame.exe) only takes 1:24 minutes:seconds, so I'm wondering why it takes 11 extra minutes to do it inside VirtualDub. If instead I also do a "Full processing mode" of the audio and set the compression to Lame MP3 (44100 Hz, 128 kbps CBR, Stereo): Now, if I re-encode the video (Full-Processing, Compression=DivX 6.6.1 Codec ) and just do a "Direct stream copy" of the Audio, the conversion takes 3 minutes (for the ~50 minute video/audio stream). (For what it's worth, the test.wav was just demuxed from the original test.avi earlier, and examining it inside CoolEdit, aka, Adobe Audition, there's nothing strange about it.)
Video_dubbed = AudioDub( video_noaudio, audio ) Video_noaudio = KillAudio( video_original ) First, I am feeding a little AviSynth script to VirtualDub:
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