CS8 MP4 Import - audio quality

  • 2
  • Question
  • Updated 4 years ago
I am evaluating CS8 for our elearning team. The audio quality of the mp4 files deteriorate once it is imported to the clip bin. If I split the audio to mp3 and import, the quality is good..Did anyone came across such an issue? Is there any import settings for mp4?
Photo of Shaji Sebastian

Shaji Sebastian

  • 2 Posts
  • 0 Reply Likes

Posted 7 years ago

  • 2
Photo of Aaron

Aaron

  • 191 Posts
  • 33 Reply Likes
Hi Shaji,

Thank-you for your input! The clip-bin should be importing your files as-is... could you let me know some more about the file your trying to import? For example, is it a screen recording, a webcam, a microphone recording, or a preexisting file? The reason why I ask is that there are many factors that could be affecting the audio quality of the files you're working with.

Regards,

Aaron
Photo of Globus

Globus

  • 15 Posts
  • 1 Reply Like
The same problem here. I also want a mono output. There is no such option in mp4 export.
(Edited)
Photo of Joe Morgan

Joe Morgan

  • 7533 Posts
  • 4132 Reply Likes
The newer versions of Camtasia 8 have a "Mix to Mono" option in the Audio tab of the Editor. See Image Below.

Regards, Joe

(Edited)
Photo of Globus

Globus

  • 15 Posts
  • 1 Reply Like
Thanxs,
In my case CS 8.4.4 the option "mix to mono" is disabed. I dont know way. The file is imported as an external WAV file.

What about the distortion ?
(Edited)
Photo of Shaji Sebastian

Shaji Sebastian

  • 2 Posts
  • 0 Reply Likes
Hi Aaron,

These are talking heads recorded with Logitech Webcam C920.
Video - mp4, 1280x720, 30 frames/sec
Audio - 128 bit, mono, 48kHz
Clip length 1 to 4 mins

Please let me know if you need any other information.

Regards,
Shaji
Photo of robert

robert

  • 4 Posts
  • 0 Reply Likes
I have the same problem. Files recorded on a camcorder and converted to MP4 sound fine outside Camtasia. When imported, there is a continual soft distortion and thickening of the sound, affecting both playback within Camtasia and export. It sounds a bit like a downsampling artefact.
Photo of Keith Banfield

Keith Banfield

  • 3 Posts
  • 0 Reply Likes
I had the same problem. The audio seems fine if imported as a high def .wmv file
Photo of Jess Wilkinson

Jess Wilkinson

  • 39 Posts
  • 17 Reply Likes
.wmv does not have the compression that .mp4 files have. That decompression introduces artifacts and Cam 8's 16 bit processing will further distort that signal until any anomaly (eg. tiny fan in background) will make the whole audio track worthless.
(Edited)
Photo of Jess Wilkinson

Jess Wilkinson

  • 39 Posts
  • 17 Reply Likes
Downsampling with 16 bit dynamic range native to Cam 8 will cause harmonic distortion in Camtasia 8. Do the downsample outside of camtasia & only import in 44.1 16 bit for Camtasia use.

Use a tool like: http://www.goldwave.com/ or audacity to handle the audio or only record in Cam using 44.1khz 16bit input.
(Edited)
Photo of Globus

Globus

  • 15 Posts
  • 1 Reply Like
How to force mono audio output in mp4 encoding video ? There is no such option. What happens in case I import an MP3 file and I want direct audio output ? Is this a possible scenario ?
Photo of Keith Banfield

Keith Banfield

  • 3 Posts
  • 0 Reply Likes
You can change a stereo recording into mono in Camtesia - the fact is that the latest version of Camtesia is in some way compressing the audio from a video file that is imported and in some cases significantly reducing the quality. Audio quality is important so this is a shame. Camtesia also needs some audio level meters so you can get that part of the production right.
Photo of Globus

Globus

  • 15 Posts
  • 1 Reply Like
Hi,

Thank you for your reply. The "mono output" is disabled in my case. I dont know maybe because the audio stream is created from an external audio software and is not part of the captured video.

The result just sucks. I have audio distortions which means I get wrong downgrade sampling or peaks above the maximum 0dbfs .

I will try to add the audio stream from an external application. The friendly production line with this way flies away !! 

I am using the free app YAMB 1.6.0 for this purpose for everyone who wants to mux an audio stream to an existing video.

So pitty for TechSmith products !!!!
(Edited)
Photo of BubbleBobble

BubbleBobble

  • 1 Post
  • 0 Reply Likes
I have the same issue in Camtasia 8.6.
Importing a preexisting MP4 file, which plays nicely in VLC and other players. Audio gets "chirpy" in Camtasia Studio 8. I know of  two colleagues in my company that they have the same issue.

Help needed to fix this!
Photo of Globus

Globus

  • 15 Posts
  • 1 Reply Like
Export audio to wav 16bit and reimport. Else just mux your audio with an external app like mp4box
Photo of Christopher Charles Arthur Huber

Christopher Charles Arthur Huber

  • 2 Posts
  • 5 Reply Likes
Same issue here. I record my audio in Audition - 16 bit wav mono at high quality. Any sound file other than mp3, audio quality degrades after import. However, 320 kbps mono mp3 is what I use instead and the quality remains steady. File size is minimal as well.

This conversation is no longer open for comments or replies.