Moritz Barsnick wrote > Hi Alex, > >> I guess there is somehing wrong with the channel mapping, but without the >> fliter_complex the mapping seems to be okay. > > I think the filter_complex messes up the mapping. Note this mapping > from your output: >> Stream mapping: >> Stream #0:2 (pcm_s24le) -> atrim >> atrim -> Stream #0:0 (pcm_s24le) >> Stream #0:0 -> #0:1 (copy) > > and this result: >> Output #0, mxf, to 'test_new.mxf': >> Stream #0:0: Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 >> kb/s >> Stream #0:1: Video: mpeg2video, yuv422p, 1920x1080 [SAR 1:1 DAR >> 16:9], > > and this warning: >> [mxf @ 00000000003b69c0] there must be exactly one video stream and it >> must be the first one > > I'm sure that's your issue. The filter seems to be messing up the > mapping, at least in this automatic case. > > Instead of > >> C:\>ffmpeg -i test.mxf -vcodec copy -map 0:v -acodec pcm_s24le -map 0:1 >> -map 0:2 -filter_complex "[a:1]atrim=start=0.035" test_new.mxf > > you probably need something like > > ffmpeg -i test.mxf -vcodec copy -map 0:v -acodec pcm_s24le -map 0:1 > -filter_complex "[a:1]atrim=start=0.035[ashifted]" -map "[ashifted]" > test_new.mxf > > (Untested) Note that I'm trying to explicitly map the filter output to > a particular stream, avoiding automatic mapping. You may have to play > around a bit more with the map options. > > Is this a bug, BTW? Documentation on "-map" states: >> The first -map option on the command line specifies the source for >> output stream 0, the second -map option specifies the source for >> output stream 1, etc. > > Digging further, documentation of "-filter_complex" clarifies: >> Output link labels are referred to with ‘-map’. Unlabeled outputs >> are added to the first output file. > > So the first documentation section is somewhat unclear, as it is > "disturbed" by the second behavior. (And in the second section: "first > output file" -> "first output stream", right?) > > Moritz
Hi Moritz, thanks for your help, works great! The mapping thing is still a bit confusing to me. :) One last problem: I would like to set the sample format of the second stream back to s32. I tried the follwoing, but it won't work: ffmpeg -i test.mxf -vcodec copy -map 0:v -map 0:1 -sample_fmt s32 -c:a:0 copy -c:a:1 pcm_s24le -sample_fmt:a:1 s32 -filter_complex "[a:1]atrim=start=0.035[ashifted]" -map "[ashifted]" test_new.mxf Thanks, Alex -- View this message in context: http://ffmpeg-users.933282.n4.nabble.com/Right-audio-channel-shifted-tp4667730p4667768.html Sent from the FFmpeg-users mailing list archive at Nabble.com. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user