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Hi, I want to merge two audio track with delay for one of this (in ms) in ffmpeg
Problem, I have one in .AC3 and an other in .AAC
Why i want to do this ?
I have two source of a video with the same duration but i don't know why, with my earphone with the .AC3 only the the right earpiece work and with the .ACC only the left work.
Thanks for your help and sorry if i don't anwser the next hour I will not be present.
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Post an mediainfo report (text mode) of both videos here
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Code:
General Format : ADTS Format/Info : Audio Data Transport Stream File size : 88.1 MiB Overall bit rate mode : Variable Audio Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Format version : Version 4 Codec ID : 2 Bit rate mode : Variable Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 88.1 MiB (100%)
Code:General Format : AC-3 Format/Info : Audio Coding 3 Commercial name : Dolby Digital File size : 86.4 MiB Duration : 1 h 34 min Overall bit rate mode : Constant Overall bit rate : 128 kb/s Audio Format : AC-3 Format/Info : Audio Coding 3 Commercial name : Dolby Digital Duration : 1 h 34 min Bit rate mode : Constant Bit rate : 128 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 31.250 FPS (1536 SPF) Compression mode : Lossy Stream size : 86.4 MiB (100%) Service kind : Complete Main
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I meant the full information, incl. Videostream and others.
BTW, both audio tracks are stereo (2 channels) so it is very unlikely that both tracks have only 1 channel of audio each. -
Code:
General Format : Matroska Format version : Version 1 File size : 1.41 GiB Duration : 1 h 34 min Overall bit rate : 2 133 kb/s Encoded date : UTC 2019-12-04 11:52:05 Writing library : WonderShare Matroska Muxer Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Main@L4.1 Format settings : CABAC / 2 Ref Frames Format settings, CABAC : Yes Format settings, Reference frames : 2 frames Format settings, GOP : M=3, N=25 Codec ID : V_MPEG4/ISO/AVC Duration : 1 h 34 min Bit rate : 1 963 kb/s Width : 640 pixels Height : 480 pixels Display aspect ratio : 4:3 Frame rate mode : Constant Frame rate : 29.970 (30000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.213 Stream size : 1.29 GiB (92%) Default : Yes Forced : No Audio ID : 2 Format : AC-3 Format/Info : Audio Coding 3 Commercial name : Dolby Digital Codec ID : A_AC3 Duration : 1 h 34 min Bit rate mode : Constant Bit rate : 128 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 31.250 FPS (1536 SPF) Bit depth : 16 bits Compression mode : Lossy Stream size : 86.4 MiB (6%) Service kind : Complete Main Default : Yes Forced : No
Code:General Format : Matroska Format version : Version 4 File size : 1 016 MiB Duration : 1 h 34 min Overall bit rate mode : Variable Overall bit rate : 1 506 kb/s Encoded date : UTC 2021-10-27 15:53:37 Writing application : mkvmerge v61.0.0 ('So') 64-bit Writing library : libebml v1.4.2 + libmatroska v1.6.4 Cover : Yes Attachments : cover.bmp Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Main@L3 Format settings : CABAC / 1 Ref Frames Format settings, CABAC : Yes Format settings, Reference frames : 1 frame Format settings, GOP : M=1, N=15 Codec ID : V_MPEG4/ISO/AVC Duration : 1 h 34 min Bit rate mode : Variable Bit rate : 1 373 kb/s Maximum bit rate : 2 058 kb/s Width : 640 pixels Height : 480 pixels Display aspect ratio : 4:3 Frame rate mode : Constant Frame rate : 29.970 (30000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.149 Stream size : 927 MiB (91%) Default : Yes Forced : No Color primaries : BT.601 NTSC Transfer characteristics : BT.709 Matrix coefficients : BT.601 Audio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : A_AAC-2 Duration : 1 h 34 min Bit rate : 128 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 86.4 MiB (8%) Language : French Default : Yes Forced : No -
Cut from video 1 (with ac3 audio) 20 seconds from position 10 minutes with avidemux and post it here
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If really each audio track has one silent channel (weird but I've seen / heard weird things like that on supposedly professionally made DVDs), there's no point in merging the “good” channel from each one, just convert one track (the best sounding one obviously, if any — it is likely that the AAC track was transcoded from the native AC3 track, which would be stupid since they have the same rather low bitrate, if that's indeed the case stick with the AC3 — what's puzzling is why on Earth the channels were reversed ?) to mono by discarding the silent channel, or duplicate the “good” channel to get double mono (may be better for compatibility reasons — some standalone devices may prefer not to read mono audio, although I have no evidence of that). This can be done quite easily with Audacity, perhaps a single ffmpeg command would do the trick but I wouldn't know how to proceed.
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