Tukukkk

I am using FFMpeg to scale, pad and merge 2 videos and generate one mp4 file. I am using the following command which leads to an output file with no audio for few seconds in the middle of the second video. Also, there is a faint white border displayed for few seconds on the black frame that I am creating. Though there are no errors in the command but I am getting a warning "[swscaler @ 0x6987800] Warning: data is not aligned! This can lead to a speed loss".

I checked other posts here and tried the solutions provided but it didn't work for me. It would be great if some one can help point out what I am missing.

Thanks in advance.

Here is the command:

ffmpeg -i 1_a.opus -i 2_a.opus -itsoffset 0.024181 -i 01_v.webm -itsoffset 0.113192 -i 02_v.webm -filter_complex 

"[1:a]adelay=15726.168|15726.168[a1]; 

[0:a][a1]amix; 

[3:v]trim=0:15.726168,geq=0:128:128[silence]; 

[3:v]fifo[3v]; 

[silence][3v]concat[3_v_silence]; 

[3_v_silence]scale=-1:240[3v_scaled_240]; 

[3v_scaled_240]pad=width=320:height=240:x=(320-in_w)/2:y=(240-in_h)/2:color=black[3v_padded]; 

[2:v]scale=-1:240[2v_scaled_240]; 

[2v_scaled_240]pad=width=320:height=240:x=(320-in_w)/2:y=(240-in_h)/2:color=black[2v_padded]; 

[2v_padded]fifo[2v]; 

[2v][3v_padded]hstack[out_v]; 

[out_v]pad=width=640:height=480:x=(640-in_w)/2:y=(480-in_h)/2:color=black" 

-crf 40 -preset ultrafast -y -r pal out.mp4 

Console output:

ffmpeg version 4.0.2-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2018 the FFmpeg developers

  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516

  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg

  libavutil      56. 14.100 / 56. 14.100

  libavcodec     58. 18.100 / 58. 18.100

  libavformat    58. 12.100 / 58. 12.100

  libavdevice    58.  3.100 / 58.  3.100

  libavfilter     7. 16.100 /  7. 16.100

  libswscale      5.  1.100 /  5.  1.100

  libswresample   3.  1.100 /  3.  1.100

  libpostproc    55.  1.100 / 55.  1.100

Input #0, ogg, from '1_a.opus':

  Duration: 00:01:03.82, start: -0.020000, bitrate: 37 kb/s

    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp

Input #1, ogg, from '2_a.opus':

  Duration: 00:00:52.40, start: -0.020000, bitrate: 44 kb/s

    Stream #1:0: Audio: opus, 48000 Hz, stereo, fltp

Input #2, matroska,webm, from '01_v.webm':

  Metadata:

    encoder         : Lavf56.40.101

  Duration: 00:01:03.83, start: 0.000000, bitrate: 202 kb/s

    Stream #2:0: Video: vp8, yuv420p(progressive), 640x480, SAR 1:1 DAR 4:3, 333 fps, 333 tbr, 1k tbn, 1k tbc (default)

Input #3, matroska,webm, from '02_v.webm':

  Metadata:

    encoder         : Lavf56.40.101

  Duration: 00:00:52.34, start: 0.000000, bitrate: 200 kb/s

    Stream #3:0: Video: vp8, yuv420p(progressive), 480x640, SAR 1:1 DAR 3:4, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)

Stream mapping:

  Stream #0:0 (opus) -> amix:input0

  Stream #1:0 (opus) -> adelay

  Stream #2:0 (vp8) -> scale

  Stream #3:0 (vp8) -> trim

  Stream #3:0 (vp8) -> fifo

  amix -> Stream #0:0 (aac)

  pad -> Stream #0:1 (libx264)

Press [q] to stop, [?] for help

[swscaler @ 0x6484740] Warning: data is not aligned! This can lead to a speed loss

[libx264 @ 0x63a0d40] using SAR=1/1

[libx264 @ 0x63a0d40] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowShuffle

[libx264 @ 0x63a0d40] profile Constrained Baseline, level 3.0

[libx264 @ 0x63a0d40] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=40.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0

Output #0, mp4, to 'out.mp4':

  Metadata:

    encoder         : Lavf58.12.100

    Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)

    Metadata:

      encoder         : Lavc58.18.100 aac

    Stream #0:1: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)

    Metadata:

      encoder         : Lavc58.18.100 libx264

    Side data:

      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1

frame= 1598 fps=131 q=-1.0 Lsize=    1375kB time=00:01:08.16 bitrate= 165.3kbits/s dup=2 drop=1047 speed=5.57x    

video:455kB audio:883kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.787654%

[aac @ 0x63a31c0] Qavg: 32520.934

[libx264 @ 0x63a0d40] frame I:7     Avg QP:32.00  size:  5746

[libx264 @ 0x63a0d40] frame P:1591  Avg QP:33.93  size:   267

[libx264 @ 0x63a0d40] mb I  I16..4: 100.0%  0.0%  0.0%

[libx264 @ 0x63a0d40] mb P  I16..4:  0.3%  0.0%  0.0%  P16..4:  4.2%  0.0%  0.0%  0.0%  0.0%    skip:95.5%

[libx264 @ 0x63a0d40] coded y,uvDC,uvAC intra: 21.3% 18.9% 3.0% inter: 1.1% 0.5% 0.0%

[libx264 @ 0x63a0d40] i16 v,h,dc,p: 54% 27% 11%  9%

[libx264 @ 0x63a0d40] i8c dc,h,v,p: 69% 17% 10%  4%

[libx264 @ 0x63a0d40] kb/s:58.22