I have an old .avi file where the sound is just scratchy, no mystery there but I have a wmv file presumably derived from the .avi file but the wmv HAS the sound. Has anyone any ideas what may have happened and how to fix it?
In 2006 we recorded a birthday party with my girlfriends computer, it was running XP and recording was done with a Logitech Quickcam for notebooks probably using quickcapture (quickcam 8.4.8). My girlfriend then edited parts of the clips in Windows Movie Maker, converting it to a .wmv and sent it to our friends. However, in the original clips a friend of mine held a hilarious monolog and subsequently fell off the chair. I really want this clip for a thing we are doing for his stag-party.
NOW, The how can the original avi clip have weird scratchy sound, just static really, and the edited version, a wmv clip, have perfect sound? I ran them through mediainfo and got the data attached below.
I have tried the following without success:
- Recoding the avi to different format.
- Using audacity to check the sound profile, and the avi has a sound profile that looks like solid band of static with a few spikes. I have tried every filter on audacity with out result
- Firing up the old computer and checking if the sound is there – it is not but the original has been copied to different folders since it’s creation. I tried to replicate the situation with the cam, first recording then running through moviemaker but those clips retain the sound.
If the file is simply corrupt it must have happened when my girlfriend moved it to another folder in the same computer and it must have happened with all the avi files from the Logitech cam (they all have the same problem). Is this likely?
Could the Logitech software have used some weird codec or mux that subsequently disappeared in later updates so that the current software uses the wrong demux or codec to open the avi?
Could the program have written the wrong demux /codec info into avi? Is there a player where I can force the use of a specific codec to test this. Could it be some sort of little-endian – Big-endian issue?
Please someone help me with this!
Complete name Video 3.avi (without sound) last change: 2006-08-20 16:46 Format : AVI Format/Info : Audio Video Interleave File size : 145 MiB Duration : 7 min 55 s Overall bit rate : 2 556 kb/s IsTruncated : Yes Video ID : 0 Format : Indeo 4 Codec ID : IV50 Codec ID/Info : Intel Indeo Video 5.0 Wavelet Duration : 7 min 55 s Bit rate : 2 378 kb/s Width : 640 pixels Height : 480 pixels Display aspect ratio : 4:3 Frame rate : 15.000 FPS Bits/(Pixel*Frame) : 0.516 Stream size : 135 MiB (93%) Title : qc2.avi Video #1 Audio ID : 1 Format : PCM Format settings, Endianness : Little Format settings, Sign : Unsigned Codec ID : 1 Duration : 7 min 55 s Bit rate mode : Constant Bit rate : 176.4 kb/s Channel(s) : 1 channel Sampling rate : 22.05 kHz Bit depth : 8 bits Stream size : 10.0 MiB (7%) Alignment : Aligned on interleaves Interleave, duration : 2954 ms (44.32 video frames) Title : qc2.avi Audio #1 Complete name Party 2006.wmv (With sound) last change:2006-08-20 17:43 Format : Windows Media File size : 26.4 MiB Duration : 4 min 13 s Overall bit rate mode : Constant Overall bit rate : 873 kb/s Maximum Overall bit rate : 874 kb/s Encoded date : UTC 2006-08-20 16:40:48.328 Application : Windows Movie Maker 2.1.4026.0 Video ID : 2 Format : VC-1 Format profile : MP@ML Codec ID : WMV3 Codec ID/Info : Windows Media Video 9 Codec ID/Hint : WMV3 Description of the codec : Windows Media Video 9 Duration : 4 min 13 s Bit rate mode : Constant Bit rate : 768 kb/s Width : 640 pixels Height : 480 pixels Display aspect ratio : 4:3 Frame rate : 25.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Compression mode : Lossy Bits/(Pixel*Frame) : 0.100 Stream size : 23.2 MiB (88%) Language : Swedish Audio ID : 1 Format : WMA Format version : Version 2 Codec ID : 161 Codec ID/Info : Windows Media Audio Description of the codec : Windows Media Audio 9.1 - 96 kbps, 44 kHz, stereo (A/V) 1-pass CBR Duration : 4 min 13 s Bit rate mode : Constant Bit rate : 96.0 kb/s Channel(s) : 2 channels Sampling rate : 44.1 kHz
I have extracted the audio from the original avi file using ffmpeg to a wav file with the same bit and samplingrate. The result from audacity is below. However Audacity does not seem to want to open the file in 8 bit. I tried wavosaur with the same result. Picture of waveform in audacity - the grey box is a section that I tried declipping with audacity. To the very left is a close zoom of the curve
Attached clip of audio with unchanged format is found here Download clip