I have a video file from a ProRes recorder (Odyssey 7Q+) and when I copy an audio stream to a new file, ffmpeg seems to be changing the audio properties, including the codec. MediaInfo also says the original audio is signed, and the new audio is unsigned.
ffmpeg i Video1.mov -map 0:6 -c copy New video.mov
Original Audio (stream 0:6): pcm_s32be (lpcm / 0x6D63706C), 48000 Hz, 2 channels, s32, 3072 kb/s (default)
New Audio (stream 0:0): pcm_s32be (in32 / 0x32336E69), 48000 Hz, stereo, s32, 3072 kb/s (default)
Any help is appreciated!
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Last edited by vandalay22; 5th Nov 2019 at 19:49.
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You can try submitting a ffmpeg bug report ticket to have a developer look at it
https://trac.ffmpeg.org/wiki
or try asking CD, they have good support -
Thanks jagabo. In the hex editor I changed in32 entries to lpcm. After this ffmpeg displayed:
Audio: pcm_s16be (lpcm / 0x6D63706C), 48000 Hz, stereo, s16, 1536 kb/s (default)
Which is the correct codec label, but it is now listed as 16bit and 1536 kb/s (instead of 32bit, 3072 kb/s). Media Info also reported 16bit, but now the audio was signed (as it was supposed to be originally)
I figure these results are a mistake (due to me messing around with the hex editor), as the file size didn't change. The Convergent Design CDProRes Transfer Tool now muxes the files, but the audio for the newly replaced section is just bursts of static. Image is fine, and audio for the rest is fine. So I am making progress. Thanks for the help.
Still not sure how to make end up with lpcm and 32bit though... -
I ended up messing around more with the hex editor and finally got the desired results. Thanks again for your suggestions, jagabo.
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