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Joined: 6/26/2011(UTC)
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I made a foolish last minute decision to try the vmix codec without proper testing, and now I have 2 very broken recordings! vMix video codec, 1920x1080, 29.97, MKV. 3 & half hour recording. Main output, and a clean without overlays. When I try to play the files, any video player just locks up. A look in task manager shows the player reading the drive at 500MB/s so it's trying to open it. Premiere behaves similarly. If I open the recording as an input in vMix, it takes a long time but will eventually open it. It's very temperamental, trying to skip along it just freezes and there is no audio for some reason, but as far as I can tell it will actually play it. Taking a look in ffmpeg: Quote:[matroska,webm @ 0000021bb9a28a00] Unknown/unsupported AVCodecID V_MS/VFW/FOURCC.
[matroska,webm @ 0000021bb9a28a00] Could not find codec parameters for stream 0 (Video: none (VMX1 / 0x31584D56), none, 1920x1080): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, matroska,webm, from 'Chessboxing Tx Clean - 14 March 2020 - 06-52-53 PM - Output 2.mkv':
Metadata:
encoder : DirectShow Matroska Muxer
creation_time : 2020-03-14T19:52:53.000000Z
Duration: 03:28:20.57, start: 0.000000, bitrate: 128071 kb/s
Stream #0:0(eng): Video: none (VMX1 / 0x31584D56), none, 1920x1080, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s (default) Frame rate is correct here at 29.97, although I have little understanding of what tbn and tbc are, 1k seems to be normal. Audio track is present. To try and fix the file I just did a -vcodec copy -acodec copy Inspecting the result, it's now 59.94fps! Quote:[avi @ 000001928f798940] Could not find codec parameters for stream 0 (Video: none (VMX1 / 0x31584D56), none, 1920x1080, 137372 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, avi, from 'fix1.avi':
Metadata:
encoder : Lavf58.39.101
Duration: 00:15:40.24, start: 0.000000, bitrate: 138918 kb/s
Stream #0:0: Video: none (VMX1 / 0x31584D56), none, 1920x1080, 137372 kb/s, SAR 1:1 DAR 16:9, 59.94 fps, 59.94 tbr, 59.94 tbn, 59.94 tbc
Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s Of course this file plays back fast, but the audio is now working, and not fast, strange. Stuck it in Premiere and tried to simply half it's frame rate... Premiere won't even play the file, just gets stuck flicking back and forth between the first 2 frames. Don't think I'll be using vmix codec again! This is not the end of the world, I was running an external recorder on the main output as a backup, and I'm thinking I could just let vmix play out the clean file in real time while I record it! But I imagine that will come with it's own problems of sync drift etc. If anyone can help me rescue these files properly, I would be most grateful.
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