Unable to convert quicktime audio

[r3v3rb]

I have recently updated to Quicktime 7.1.3 on an Intel Dual Core Macbook Pro and ever since the captured DV from my video camera has no audio when converting with FFMpegX 0.0.9xr2. If I export the PCM audio out to an AIFF file from Quicktime then it has no trouble converting the audio to mp2 format.

Have Apple changed the audio encoding of DV streams without telling anyone as I would suspect that there is a standard and that it shouldn't change from version to version of Quicktime or has something broken within FFMpegX ??

Any help to save the extra process would be great.

[rumplestiltskin]

Check the camcorder to verify that you're recording in 16-bit, not 12-bit. (At least, that's what I remember the last time something like this came up).

Are you dropping the DV file into ffmpegX? If not, how are you doing this?

[r3v3rb]

Right the audio has been captured as "pcm_s16le, 48000 Hz, stereo, 1536 kb/s" which I believe to be 16bit. When captured previously with FC:Express, FFMpegX had no trouble encoding the audio. This time I thought I would cheat the system and use quicktime directly to capture the DV stream.

Now I have two DV .mov files that FFMpegX cannot encode the audio from. A workaround has been to Export the audio from quicktime as an AIFF and then encode the audio seperately and then mux the two together with a guessed sync offset.

Just hoped that it might be something simple that I had been missing. Any ideas ?

[rumplestiltskin]

Take what you have and use MPEG Streamclip to "save as QuickTime", perhaps using the DV option or the MJPEGB option. Force the audio stream to the proper specs in the settings there and then import the result into ffmpegX.

Do double-check A/V sync before submitting the file to ffmpegX.