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19 février 2013, par
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Type : Image
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Richard Stallman et la révolution du logiciel libre - Une biographie autorisée (version epub)
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Sur d’autres sites (6198)
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FFmpeg filter complex add audio file to video at specific points
4 juin 2020, par steveatrim=0:2
starts fine when I play the video it plays the mp3 now how do I add a working end time say finish at 9 seconds ?


Summary I want to start at 2 seconds and finish at 9 seconds.



ffmpeg -y -i "C:\Users\test\Desktop\vidz\New folder (2)\target\vaastav song .mp4" -i "C:\Users\test\Desktop\vidz\New folder (2)\target\2.mp3" -filter_complex "[0]atrim=0:2[Apre];[0]atrim=5,asetpts=PTS-STARTPTS[Apost];[Apre][1][Apost]concat=n=3:v=0:a=1" -vcodec copy -y "C:\Users\test\Desktop\vidz\New folder (2)\target\output1.mp4"




log file



ffmpeg version git-2020-04-13-59e3a9a Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 9.3.1 (GCC) 20200328
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
 libavutil 56. 42.102 / 56. 42.102
 libavcodec 58. 78.102 / 58. 78.102
 libavformat 58. 42.100 / 58. 42.100
 libavdevice 58. 9.103 / 58. 9.103
 libavfilter 7. 77.101 / 7. 77.101
 libswscale 5. 6.101 / 5. 6.101
 libswresample 3. 6.100 / 3. 6.100
 libpostproc 55. 6.100 / 55. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\test\Desktop\vidz\New folder (2)\target\vaastav song .mp4':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: isommp42
 creation_time : 2018-09-02T04:28:46.000000Z
 Duration: 00:05:08.80, start: 0.000000, bitrate: 2289 kb/s
 Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 2160 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
 Metadata:
 creation_time : 2018-09-02T04:28:46.000000Z
 handler_name : ISO Media file produced by Google Inc. Created on: 09/01/2018.
 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
 Metadata:
 creation_time : 2018-09-02T04:28:46.000000Z
 handler_name : ISO Media file produced by Google Inc. Created on: 09/01/2018.
Input #1, mp3, from 'C:\Users\test\Desktop\vidz\New folder (2)\target\2.mp3':
 Metadata:
 genre : Electronic;Indie
 title : A Distorted Noise With A Little Bit Of Sense
 artist : Lenin Was A Zombie
 encoder : Lavf56.19.100
 major_brand : mp42
 minor_version : 0
 compatible_brands: isommp42
 Duration: 00:00:54.00, start: 0.025057, bitrate: 192 kb/s
 Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 192 kb/s
 Metadata:
 encoder : Lavc56.21
Stream mapping:
 Stream #0:1 (aac) -> atrim
 Stream #0:1 (aac) -> atrim
 Stream #1:0 (mp3float) -> concat:in1:a0
 concat -> Stream #0:0 (aac)
 Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
Output #0, mp4, to 'C:\Users\test\Desktop\vidz\New folder (2)\target\output1.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: isommp42
 encoder : Lavf58.42.100
 Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 encoder : Lavc58.78.102 aac
 Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 2160 kb/s, 25 fps, 25 tbr, 90k tbn, 90k tbc (default)
 Metadata:
 creation_time : 2018-09-02T04:28:46.000000Z
 handler_name : ISO Media file produced by Google Inc. Created on: 09/01/2018.
frame= 737 fps=0.0 q=-1.0 size= 7936kB time=00:00:29.44 bitrate=2208.1kbits/s speed=58.9x 
[out_0_0 @ 000000000312c900] 100 buffers queued in out_0_0, something may be wrong.
[out_0_0 @ 000000000312c900] 1000 buffers queued in out_0_0, something may be wrong.
frame= 1401 fps=876 q=-1.0 size= 16640kB time=00:01:46.85 bitrate=1275.7kbits/s speed=66.8x 
frame= 2281 fps=1086 q=-1.0 size= 26112kB time=00:02:22.01 bitrate=1506.3kbits/s speed=67.6x 
frame= 3152 fps=1212 q=-1.0 size= 35584kB time=00:02:56.58 bitrate=1650.8kbits/s speed=67.9x 
frame= 4011 fps=1294 q=-1.0 size= 45824kB time=00:03:31.32 bitrate=1776.4kbits/s speed=68.2x 
frame= 4882 fps=1356 q=-1.0 size= 56320kB time=00:04:06.03 bitrate=1875.2kbits/s speed=68.3x 
frame= 5753 fps=1403 q=-1.0 size= 66560kB time=00:04:40.79 bitrate=1941.8kbits/s speed=68.5x 
frame= 6622 fps=1440 q=-1.0 size= 77056kB time=00:05:15.37 bitrate=2001.6kbits/s speed=68.6x 
frame= 7482 fps=1467 q=-1.0 size= 85248kB time=00:05:50.20 bitrate=1994.1kbits/s speed=68.7x 
frame= 7720 fps=1479 q=-1.0 Lsize= 87248kB time=00:05:59.79 bitrate=1986.5kbits/s speed=68.9x 
video:81451kB audio:5634kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.186449%
[aac @ 0000000003017ac0] Qavg: 648.065




I tried messing about with the line of code but no success so I turn to you for additional support


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How is frame data stored in libav ?
9 juillet 2020, par Wesley SI am trying to learn to use libav. I have followed the very first tutorial on dranger.com, but I got a little confused at one point.


// Write pixel data
for(y=0; ydata[0]+y*pFrame->linesize[0], 1, width*3, pFile);



This code clearly works, but I don't quite understand why, particulalry I don't understand how the frame data in
pFrame->data
stored, whether or not it depends on the format/codec in use, whypFrame->data
andpFrame->linesize
is always referenced at index 0, and why we are adding y topFrame->data[0]
.

In the tutorial it says




We're going to be kind of sketchy on the PPM format itself ; trust us, it works.




I am not sure if writing it to the ppm format is what is causing this process to seem so strange to me. Any clarification on why this code is the way it is and how libav stores frame data would be very helpful. I am not very familiar with media encoding/decoding in general, thus why I am trying to learn.


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FFMPEG [mp3float @ 0x7fd42f813200] Header missing
10 février 2021, par rahi82I have a problem with some mp3 files. When transcoding the file with FFMPEG I get the following error :


[mp3float @ 0x7fd42f813200] Header missing
Error while decoding stream #0:0: Invalid data found when processing input



Is this a problem of the file itself, and how it is produced ?
Or is it a problem of FFMPEG ?


Here full decoding message :


ffmpeg version git-2020-07-28-dfd12ee Copyright (c) 2000-2020 the FFmpeg developers
 built with Apple clang version 11.0.0 (clang-1100.0.33.16)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD-dfd12ee_2 --enable-shared --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libaom --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-demuxer=dash --disable-libjack --disable-indev=jack --enable-opencl --enable-videotoolbox --disable-htmlpages --enable-libfdk-aac --enable-nonfree
 libavutil 56. 57.100 / 56. 57.100
 libavcodec 58. 97.102 / 58. 97.102
 libavformat 58. 49.100 / 58. 49.100
 libavdevice 58. 11.101 / 58. 11.101
 libavfilter 7. 87.100 / 7. 87.100
 libswscale 5. 8.100 / 5. 8.100
 libswresample 3. 8.100 / 3. 8.100
 libpostproc 55. 8.100 / 55. 8.100
[mp3 @ 0x7fd42f808200] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from 'Ice Mc - Think About The Way.mp3':
 Metadata:
 title : Think About The Way
 TBPM : 133
 artist : Ice MC
 date : 1994
 track : 4/15
 disc : 0
 album_artist : ICE MC
 Duration: 00:04:16.39, start: 0.000000, bitrate: 323 kb/s
 Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
 Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 600x592 [SAR 72:72 DAR 75:74], 90k tbr, 90k tbn, 90k tbc (attached pic)
 Metadata:
 comment : Other
Stream mapping:
 Stream #0:1 -> #0:0 (mjpeg (native) -> wrapped_avframe (native))
 Stream #0:0 -> #0:1 (mp3 (mp3float) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
 Metadata:
 title : Think About The Way
 TBPM : 133
 artist : Ice MC
 date : 1994
 track : 4/15
 disc : 0
 album_artist : ICE MC
 encoder : Lavf58.49.100
 Stream #0:0: Video: wrapped_avframe, yuvj420p(progressive), 600x592 [SAR 72:72 DAR 75:74], q=2-31, 200 kb/s, 90k fps, 90k tbn, 90k tbc (attached pic)
 Metadata:
 comment : Other
 encoder : Lavc58.97.102 wrapped_avframe
 Stream #0:1: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
 Metadata:
 encoder : Lavc58.97.102 pcm_s16le
[mp3float @ 0x7fd42f813200] Header missing
Error while decoding stream #0:0: Invalid data found when processing input
frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:04:16.60 bitrate=N/A speed= 725x 
video:1kB audio:44204kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown



What is also noticed is that this mp3 has the cover embedded as a video stream. And there is also this weird cross mapping. Not sure if that is normal ?