How do I create a video file with a directly accessible audio track?

[risingSilence]

hey guys,

I am currently recording gameplay (2k60) via OBS Studio, custom output, ffmpeg.

If I choose to record the file as avi and with utvideo codec and pcm audio, and put that into vegas pro, it will take forever to build audio peaks because vegas seems to be forced to read the whole AVI file!! to access its audio track and create the peaks.

If I record something with dxtory (also utvideo, pcm, avi), I get a file that vegas pro is able to read the audio track separately -> audio peaks are available in an instant.

If I compare the media info of the two files, everything seems to be exactly the same, only difference is "writing application" (obviously) and interleave duration (dxtory 100ms, obs studio ffmpeg 21ms)

heres the media info output of the obs ffmpeg avi:

General
Complete name : D:\Andre\Videos\2018-04-28 21-43-42.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 63.4 MiB
Duration : 1 s 109 ms
Overall bit rate : 480 Mb/s
Writing application : Lavf57.84.100

Video
ID : 0
Format : YUV
Codec ID : ULH0
Codec ID/Info : Ut Video Lossless Codec
Codec ID/Hint : Ut Video
Duration : 1 s 83 ms
Bit rate : 490 Mb/s
Width : 2 560 pixels
Height : 1 440 pixels
Display aspect ratio : 16:9
Frame rate : 60.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Compression mode : Lossless
Bits/(Pixel*Frame) : 2.213
Stream size : 63.2 MiB (100%)

Audio
ID : 1
Format : PCM
Format settings : Little / Signed
Codec ID : 1
Duration : 1 s 109 ms
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Bit depth : 16 bits
Stream size : 208 KiB (0%)
Alignment : Aligned on interleaves
Interleave, duration : 21 ms (1.25 video frame)

After I recorded an OBS Studio ffmpeg avi, I tried (instead of putting it into Vegas Pro) to extract the audio via different demuxers and also ffmpeg (-vn -acodec copy), no method had an instant copy/paste of the audio track.

what is going on there?

I really need to record via OBS Studio and I need the file to behave like it is written by dxtory.

Is it possible to achieve that even with a .ts or .mp4 file?

I am looking forward to your thoughts on that!

thanks in advance!

[raffriff42]

I can confirm, the peak building is slow. If you run the file through Dxtory Avimux (and nothing else AFAICT) the peaks load much more quickly. However, Avimux itself takes a lot of time.

The peaks load even more quickly on an OBS file using its standard codecs: x264 or amd/intel/nvidia video, and aac audio in mp4, mov or mpegts. I always stick to the standard codecs. These codecs get much more attention from the developers and are always going to work better than the others.