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FFMpeg to keep multiple audio channels

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Joe Pelayo
FFMpeg to keep multiple audio channels
on Jun 4, 2011 at 4:14:13 pm

Hello.

What I am attempting to do is to transcode an H264 MP4 video file with 2 audio tracks to a DV DVCPro50 file with the same distinct audio tracks using FFMPEG. The FFMPEG is created fine as a dv file but the audio tracks are converted into a single 2 channel track. Every type of mapping configuration has produced the same results of a single audio track. How can I keep the 2 distinct audio tracks in tact after transcoding? Here is the FFProbe information on the original video which shows the 2 audio streams 0.1 and 0.2:

Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isomavc1
encoder : HandBrake 0.9.5 2011010300
Duration: 00:02:04.33, start: 0.000000, bitrate: 6197 kb/s
Stream #0.0(und): Video: h264, yuv420p, 720x480 [PAR 32:27 DA
/s, PAR 1706:1215 DAR 853:405, 29.97 fps, 29.97 tbr, 90k tbn, 18
Stream #0.1(eng): Audio: aac, 48000 Hz, mono, s16, 2 kb/s
Stream #0.2(eng): Audio: aac, 48000 Hz, mono, s16, 159 kb/s

Here is one of my attempts. This produces a dv file with a single 2 channel track.

ffmpeg -i "BaseballOriginal.mp4" -target ntsc-dv -acodec pcm_s16le -map 0:0 -map 0:1 -map 0:2 -pix_fmt yuv422p -y "C:\videos\Latakoo\KSAT\BaseballOriginal-1-2.dv" -newaudio


I can create an Mpeg file fine using the acodec -mp2 and -f vob, and it produces the correct 2 distinct audio tracks, but I need a DV file. Is my mapping wrong, or can it even be done for DV? Thanks.


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Geert van den Berg
Re: FFMpeg to keep multiple audio channels
on Jul 9, 2011 at 7:56:38 pm

Your post is already from a while ago, but I think the answer is that a DV stream doesn't support more than 1 audio track.

If you'd try the same with as output a Quicktime container (.mov) it will work.


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