HUGE sound blips when encoding Video

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This topic has 1 voice, contains 6 replies, and was last updated by Avatar of Kyle Kyle 3562 days ago.

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December 27, 2004 at 6:53 pm #77203
Avatar of Kyle
Kyle

When I export a video file from Sorenson Squeeze, sometimes in the video I get loud scratchy blip noises in the audio. The blips arent in the original file. Does anybody know why this is happening? I am encoding it as a .mov with MPEG 4 Audio at 48000khz, and 320bit rate. Here is an example of what im talking about:

NOTE: This encoding was encoded at 1.6Mbps Video Rate (Sorenson 3 Pro), and 48000Khz 320kbps 16 Channel Stereo (Mpeg 4 Audio)

http://www.geocities.com/prohaskastudios/BlipClip.mov

.mov (1.7mb)

December 27, 2004 at 8:40 pm #77216
Avatar of unfoldingmetal
unfoldingmetal

Yeah that happened to me before when I used mpeg. That is why I stopped using it. It happens to me in some but few audio files, however I have no idea what it is.

If it is possible, you might want to turn down the rendering speed, so it won’t make mistakes. I don’t know if that is possible though. Otherwise, maybe switching codecs would solve the problem.

December 29, 2004 at 2:49 am #77386
Avatar of Kyle
Kyle

Nope didnt help, it only seems to happen when I use a Xvid encoded file.:(Xvid is what all of the files I need to encode is encoded in. Any more suggestions?

December 29, 2004 at 4:13 am #77390
Avatar of Watson
Watson

It could have something to do with audio interleave. This has to do with how long individual audio segments are, by my understanding. You can have the audio segments range from one each frame to one for the entire movie. Certain processors cannot support such high rates as one each frame, or even one each second, and so pops occur.

Some programs will allow you to change the audio interleave before you render your movie, and I’ve found in my case that simply having one large audio chunk that runs throughout the whole movie removes the most popping. Despite this, I too have found that I can’t remove absolutely every pop in the audio.

December 29, 2004 at 5:20 am #77393
Avatar of Kyle
Kyle

I finally figured it out. All of the movie files that I put into the encoded had one thing in common, Xvid. I figured that was the problem untill I realized that it was audio I was working with. So I looked again and found out that they all had another thing in common. They were all ripped using the AC3 Dolby Surround Codec. I ripped a small scene again with a MP3 VBR 320kb/bitrate, and encoded in my compression program again, tada! It works fine, no pops, clicks, or blips. :D I still dont know why that specific codec causes problems but at least I know why it was happening.

December 29, 2004 at 5:43 am #77396
Avatar of LowweeK
LowweeK

Are the blips everytime at the same time ?

If it’s random, then it’s quite hopeless, you need to use another codec.

December 29, 2004 at 6:11 pm #77459
Avatar of Kyle
Kyle

No they are at the same time.

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