Lowpro
6th September 2024, 19:55
An example using FFMPEG...
The file, "00004.m2ts" contains 3 audio tracks. I want to extract the DTS-HD MA 5.1 track. To do so I first run the below from the command line to determine the mappings.
ffmpeg -i 00004.m2ts
The above provides the below results.
Stream #0:0: Video: h264 <High>, yuv420p, 1920x1080, 23.98 fps
Stream #0:1: Audio: dts <DTS-HD MA>, 5.1
Stream #0:2: Audio: dts <DTS-HD MA>, stereo
Stream #0:3: Audio: dts <AC-3>, stereo
Stream #0:4: Subtitle: hdmv_pgs_subtitle
I then run the below command to extract the DTS-HD MA 5.1 track.
ffmpeg -i 00004.m2ts -map 0:1 -c copy 00004_5.1.dts
The M2TS file in this case was 30.9 GB. It took 3 minutes to extract the audio, the file "00004_5.1.dts" weighing in at 1.60 GB. Your results may vary. My laptop is over 15 years old so for most it would take far less time I'd imagine.
Should mention as well, when running the command to extract the audio track I received the below message.
[NULL @ 006z7c40] start time is not set in estimate_timings_from_pts
I'm not sure what the above means exactly. That being said, the audio track still extracted successfully. I then muxed the audio track back into the M2TS file replacing the original DTS-HD MA 5.1 track using tsMuxer, the output option set to Blu-ray folder. When playing the Blu-ray via PowerDVD the audio track was in sync from start to finish. No issues during playback.