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• concatenate MP4 videos with FFmpeg using concat demuxer in android

  10 mai 2016, par Ara Badalyan

  I want to concatenate MP4 videos with FFmpeg, the problem is when I want to merge videos taken with Iphone and Android it throws problem :

  Non-monotonous DTS in output stream 0:1 ; previous : 150528, current : 139268 ; changing to 150529. This may result in incorrect timestamps in the output file.

  This is my code

  merge.txt

  file 'iphone.mp4'
  
  file 'android.mp4'

  FFmpeg command

  ffmpeg -f concat -i marge.txt -c copy -y merge.mp4

  If I can’t merge this videos how can I make them with same parameters (frame rate, bitrate...) and merge them ?

  I use FFmpeg version 2.4.2, because I can’t find android FFmpeg library higher then 2.4.2.

  This is complete console output of : ffmpeg -i android.mp4 -i iphone.mp4

  ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
  
         built on Oct  7 2014 15:08:46 with gcc 4.8 (GCC)
  
                 configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
                 libavutil      54.  7.100 / 54.  7.100
  
                 libavcodec     56.  1.100 / 56.  1.100
  
                 libavformat    56.  4.101 / 56.  4.101
  
                 libavdevice    56.  0.100 / 56.  0.100
  
                 libavfilter     5.  1.100 /  5.  1.100
  
                 libswscale      3.  0.100 /  3.  0.100
  
                 libswresample   1.  1.100 /  1.  1.100
  
                 libpostproc    53.  0.100 / 53.  0.100
  
               Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'android.mp4':
  
                 Metadata:
  
                   major_brand     : isom
  
           minor_version   : 512
  
                   compatible_brands: isomiso2avc1mp41
  
           encoder         : Lavf57.21.101
  
                 Duration: 00:00:01.29, start: 0.023220, bitrate: 308 kb/s
  
           Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280 [SAR 1:1 DAR 9:16], 113 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
  
           Metadata:
  
                     handler_name    : VideoHandler
  
           Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 186 kb/s (default)
  
           Metadata:
  
                     handler_name    : SoundHandler
  
       Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'iphone.mp4':
  
                 Metadata:
  
                   major_brand     : mp42
  
           minor_version   : 1
  
                   compatible_brands: mp41mp42isom
  
           creation_time   : 2016-05-10 09:46:30
  
                 Duration: 00:00:02.63, start: 0.000000, bitrate: 4768 kb/s
  
           Stream #1:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 101 kb/s (default)
  
           Metadata:
  
                     creation_time   : 2016-05-10 09:46:30
  
                     handler_name    : Core Media Audio
  
           Stream #1:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x1280, 4657 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
  
           Metadata:
  
                     creation_time   : 2016-05-10 09:46:30
  
                     handler_name    : Core Media Video
  
       At least one output file must be specified

• Capturing stream that has multiple frames

  22 mai 2016, par cheese5505

  I’m trying to capture a stream that has multiple "frames" (not sure that’s what you would call it but it has multiple 5 second streams inside of it) with FFmpeg and saving to file. When I put it into Quicktime player and play it works fine, however when I put it into FFmpeg and review the final file it seems that the audio and video are out of sync and the video frequently stops. I think this may be because it is stopping to switch to the new 5 second video but i’m not sure. This is the command I am using :

  ffmpeg \
  
      -v 9 \
  
      -loglevel 99 \
  
      -y \
  
      -re \
  
      -hwaccel auto \
  
      -threads 4 \
  
      -user-agent "Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16" \
  
      -i "url here" \
  
      -ac 2 \
  
      -strict -2 \
  
      -c:a aac \
  
      test.mov

  In the FFmpeg log this frequently happens :

  frame=  242 fps=102 q=29.0 size=     252kB time=00:00:06.33 bitrate= 325.9kbits/
  
  frame=  279 fps= 96 q=29.0 size=     252kB time=00:00:07.57 bitrate= 272.8kbits/
  
  frame=  301 fps= 87 q=29.0 size=     252kB time=00:00:08.30 bitrate= 248.7kbits/
  
  frame=  319 fps= 79 q=29.0 size=     252kB time=00:00:08.90 bitrate= 231.9kbits/
  
  frame=  338 fps= 74 q=29.0 size=     252kB time=00:00:09.54 bitrate= 216.5kbits/
  
  frame=  354 fps= 70 q=29.0 size=     252kB time=00:00:10.07 bitrate= 205.0kbits/
  
  skipping 5 segments ahead, expired from playlists
  
  [https @ 0x7f9d81e10380] No trailing CRLF found in HTTP header.
  
  frame=  355 fps= 51 q=29.0 size=     252kB time=00:00:10.11 bitrate= 204.3kbits/
  
  [hls,applehttp @ 0x7f9d83001000] No longer receiving playlist 6
  
  [hls,applehttp @ 0x7f9d83001000] No longer receiving playlist 7
  
  [hls,applehttp @ 0x7f9d83001000] No longer receiving playlist 8
  
  skipping 3 segments ahead, expired from playlists
  
  [https @ 0x7f9d81f006a0] No trailing CRLF found in HTTP header.

  Any ideas how I could smooth out the final file would be greatly appreciated.

• concatenate mp4 videos with ffmpeg concat demuxer in android

  6 mai 2016, par Ara Badalyan

  I want to concatenate mp4 videos with ffmpeg, the problem is when I want to merge videos taken with Iphone and Android it throws problem

  " Non-monotonous DTS in output stream 0:1 ; previous : 150528, current : 139268 ; changing to 150529. This may result in incorrect timestamps in the output file."

  This is my code

  merge.txt

  file 'iphone.mp4'
  
  file 'android.mp4'

  ffmpeg command

  ffmpeg -f concat -i marge.txt -c copy -y merge.mp4

  If I can’t merge this videos how can i make them with same parameters (frame rate, bitrate...) and merge them ?

  P.S I use ffmpeg version 2.4.2 , because I can’t find android ffmpeg library higher then 2.4.2.