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• ffmpeg concatenate results in bad/garbled output for second input file

  28 février 2017, par Dan

  I am trying to concatenate two videos together using the ffmpeg concat demuxer : a 5-second intro splash and a 60-second main/body video. I understand that the encoding needs to be the same on both files for this to work. I think they are, but the resulting output shows the intro just fine, followed by a totally garbled body. What am I missing ?

  ffmpeg -f concat -i concat.txt -c copy output.mp4

  Contents of concat.txt :

  file 'intro.mp4'
  
  file 'body.mp4'

  and the output of ffprobe for both input files :

  intro.mp4

  ffprobe version 3.2.4 Copyright (c) 2007-2017 the FFmpeg developers
  
    built with Apple LLVM version 7.0.2 (clang-700.1.81)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'intro.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.56.101
  
    Duration: 00:00:05.04, start: 0.000000, bitrate: 73 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x720 [SAR 1:1 DAR 4:3], 69 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  body.mp4

  ffprobe version 3.2.4 Copyright (c) 2007-2017 the FFmpeg developers
  
    built with Apple LLVM version 7.0.2 (clang-700.1.81)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'body.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.56.101
  
    Duration: 00:00:36.84, start: 0.000000, bitrate: 5615 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x720 [SAR 1:1 DAR 4:3], 5613 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  Output of ffmpeg :

  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 7.0.2 (clang-700.1.81)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fdda3018000] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from 'concat.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 69 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x720 [SAR 1:1 DAR 4:3], 69 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0(eng): Video: h264 (High) ([33][0][0][0] / 0x0021), yuv420p, 960x720 [SAR 1:1 DAR 4:3], q=2-31, 69 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fdda3800000] Auto-inserting h264_mp4toannexb bitstream filter
  
  frame= 1047 fps=973 q=-1.0 Lsize=   25299kB time=00:00:41.76 bitrate=4962.8kbits/s speed=38.8x    
  
  video:25286kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.050621%

  As far as I can tell, everything is identical except for the bitrate and language. Setting the language doesn’t seem to make a difference. I’ve tried to transcode the intro to a higher bitrate for the intro but can’t get it to stick in the output. I’m OK with transcoding one of the files (ideally the intro) but don’t know what else to try to change. Thoughts ?

• How to add text to video by time use ffmpeg

  15 mars 2017, par Thanh Dao

  I create my slideshow with command :
  

  "ffmpeg" -f concat -safe 0 -i /path/to/text.txt -i /path/to/audio.mp3 -vsync vfr -pix_fmt yuv420p /path/to/output.mp4

  The contents of text.txt

  file '/path/to/img1.jpg'
  
  duration 6
  
  file '/path/to/img2.jpg'
  
  duration 6
  
  file '/path/to/img3.jpg'
  
  duration 6
  
  file '/path/to/img4.jpg'
  
  duration 6
  
  file '/path/to/img5.jpg'
  
  duration 6
  
  file '/path/to/img6.jpg'
  
  duration 6

  The video has been cretaed perfectly. Now I want to add titles for each images displayed. Example :

  • img1.jpg displayed, show title Title 1
  • img2.jpg displayed, show title Title 2
  • img3.jpg displayed, show title Title 3

  I search a lot but got any solutions. Anyone help me. I’m stuck

• timelapse images into a movie, 500 at a time

  2 mars 2017, par molly78

  I am trying to make a script to turn a bunch of timelapse images into a movie, using ffmpeg.

  The latest problem is how to loop thru the images in, say, batches of 500.

  There could be 100 images from the day, or there could be 5000 images.

  The reason for breaking this apart is due to running out of memory.

  Afterwards I would need to cat them using MP4Box to join all together...

  I am entirely new to bash, but not entirely programming.

  What I think needs to happen is this

  1) read in the folders contents as the images may not be consecutively named

  2) send ffmpeg a list of 500 at a time to process (https://trac.ffmpeg.org/wiki/Concatenate)

  2b) while you’re looping thru this, set a counter to determine how many loops you’ve done

  3) use the number of loops to create the MP4Box cat command line to join them all at the end.

  the basic script that works if there’s only say 500 images is :

  #!/bin/bash
  
  
  
  dy=$(date '+%Y-%m-%d')
  
  
  
  ffmpeg -framerate 24 -s hd1080 -pattern_type glob -i "/mnt/cams/Camera1/$dy/*.jpg" -vcodec libx264 -pix_fmt yuv420p Cam1-"$dy".mp4

  MP4Box’s cat command looks like :

  MP4Box -cat Cam1-$dy7.mp4 -cat Cam1-$dy6.mp4 -cat Cam1-$dy5.mp4 -cat Cam1-$dy4.mp4 -cat Cam1-$dy3.mp4 -cat Cam1-$dy2.mp4 -cat Cam1-$dy1.mp4 "Cam1 - $dy1 to $dy7.mp4"

  Needless to say help is immensely appreciated for my project