FFAStrans forum

Hi again,

I have a pretty simple workflow that I just can't get to work as I want. The main problem seems to be with the mp4 encoder if using the x264 codec, I simply don't get any video at all (all black).

I have a high res video with 7 audio tracks.
Audio 1-6 are separate mono streams (5.1)
Audio 7 is a wav stereo track (mixdown)

I want to create an x264 mp4 file with Audio 7 as audio track. The audio format is not important, but it should be compressed. I have used the following workflow:

1. A/V Media - Decode audio only
2. ChannelMapper - Mapping channel 7 & 8 to track 1 + 2
3. Mp4 encoder (started with default settings)

My output is always black with no sound. If I change to other decoder, I get picture but no sound. I can continue to experiment with the audio mapping options, but I have had other workflows with the same result on the mp4 encoder (just blck output), anyone who can guide me in a new direction?

Is it possible for you to export your workflow and send it to me and maybe share an example source video that initiates the issue?

-steinar

Don't you need to have to decode the video in your A/V Media node? If you only decode Audio then it's not passing the video through to the MP4 Encoder.

Yes, that's true estenmar but he should still get a working file. It would however be without the video but it should not fail. If the MP4-encoder does not find any video it will try to create an audio-file. At the same time, I have recently discovered a bug in that method and it has been corrected for the 0.7.7 release. I would just like to see how his particular workflow behaves in relation to this particular bug.

-steinar

I will send you the workflow. Unfortunately I can't send any video as I am not allowed to distribute. I will send you an export from MediaInfo. I am certain it all works just fine, but I am doing something strange...

Thanks again!!!

Try enabling full audio decode in the "A/V Media"-decoder. See if it helps.

-steinar