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• intreadwrite : Add intermediate variables in the byteswise AV_W*() macros

  1er août 2016, par Martin Storsjö

  intreadwrite : Add intermediate variables in the byteswise AV_W*() macros
  This avoids issues with expanding the argument multiple times,
  
  and makes sure that it is of the right type for the following shifts.
  Even if the caller of a macro could be expected not to pass parameters
  
  that have side effects if expanded multiple times, these fallback
  
  codepaths are rarely, if ever, tested, so it is expected that such
  
  issues can arise.
  Thefore, for safety, make sure the fallback codepaths only expand
  
  the arguments once.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavutil/intreadwrite.h

• Change the framerate of a video including audio without re-encoding using ffmpeg

  12 août 2018, par Trojaner_

  I have a 30.02 FPS .mp4-video and I’m trying to convert it to 30 FPS. I found this question but if I try the method like described in the first answer the audio gets lost because the video is getting converted in a .h264-file which can’t contain audio as I read here.

  (I’m sorry if i’ve got issues with the english language, it isn’t my mother language)

  EDIT : Here goes the content I enter in the terminal and the output that returns

  Input : ffmpeg -y -i 01.mp4 -f h264 -c copy temp1.h264

  Output : (I replaced the real paths with path\to\...)

  ffmpeg version N-91589-ge0539f0349 Copyright (c) 2000-2018 the FFmpeg developers
  
  built with gcc 8.2.1 (GCC) 20180808
  
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --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-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
  libavutil      56. 18.102 / 56. 18.102
  
  libavcodec     58. 22.101 / 58. 22.101
  
  libavformat    58. 17.101 / 58. 17.101
  
  libavdevice    58.  4.101 / 58.  4.101
  
  libavfilter     7. 26.100 /  7. 26.100
  
  libswscale      5.  2.100 /  5.  2.100
  
  libswresample   3.  2.100 /  3.  2.100
  
  libpostproc    55.  2.100 / 55.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'path\to\01.mp4':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf58.17.101
  
  Duration: 00:02:42.01, start: 0.000000, bitrate: 5168 kb/s
  
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 5000 kb/s, 30.02 fps, 30 tbr, 16k tbn, 60 tbc (default)
  
  Metadata:
  
  handler_name    : VideoHandler
  
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 159 kb/s (default)
  
  Metadata:
  
  handler_name    : SoundHandler
  
  Output #0, h264, to 'path\to\temp1.h264':
  
  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf58.17.101
  
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, q=2-31, 5000 kb/s, 30.02 fps, 30 tbr, 30 tbn, 30 tbc (default)
  
  Metadata:
  
  handler_name    : VideoHandler
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  frame= 4862 fps=0.0 q=-1.0 Lsize=   98859kB time=00:02:42.00 bitrate=4999.1kbits/s speed= 351x
  
  video:98860kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  Input : ffmpeg -y -r 30 -i "temp1.h264" -c copy "temp1.mp4"

  Output : (I replaced the real paths with path\to\...)

  ffmpeg version N-91589-ge0539f0349 Copyright (c) 2000-2018 the FFmpeg developers
  
  built with gcc 8.2.1 (GCC) 20180808
  
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --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-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
  libavutil      56. 18.102 / 56. 18.102
  
  libavcodec     58. 22.101 / 58. 22.101
  
  libavformat    58. 17.101 / 58. 17.101
  
  libavdevice    58.  4.101 / 58.  4.101
  
  libavfilter     7. 26.100 /  7. 26.100
  
  libswscale      5.  2.100 /  5.  2.100
  
  libswresample   3.  2.100 /  3.  2.100
  
  libpostproc    55.  2.100 / 55.  2.100
  
  Input #0, h264, from 'path\to\temp1.h264':
  
  Duration: N/A, bitrate: N/A
  
  Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x720, 30 fps, 30 tbr, 1200k tbn, 60 tbc
  
  Output #0, mp4, to 'path\to\temp1.mp4':
  
  Metadata:
  
  encoder         : Lavf58.17.101
  
  Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1280x720, q=2-31, 30 fps, 30 tbr, 15360 tbn, 30 tbc
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0000018e11422ec0] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
  
  [mp4 @ 0000018e11422ec0] pts has no value
  
  Last message repeated 156 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:05.13 bitrate=5719.5kbits/s speed=10.2x
  
  Last message repeated 153 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:10.26 bitrate=4902.4kbits/s speed=10.2x
  
  Last message repeated 150 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:15.30 bitrate=4934.5kbits/s speed=10.2x
  
  Last message repeated 137 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:19.90 bitrate=4953.1kbits/s speed=9.91x
  
  Last message repeated 152 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:25.00 bitrate=4949.3kbits/s speed=9.97x
  
  Last message repeated 152 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:30.10 bitrate=4946.8kbits/s speed=  10x
  
  Last message repeated 152 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:35.20 bitrate=4945.0kbits/s speed=  10x
  
  Last message repeated 146 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:40.10 bitrate=4968.3kbits/s speed=9.99x
  
  Last message repeated 153 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:45.23 bitrate=4960.8kbits/s speed=  10x
  
  Last message repeated 147 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:50.16 bitrate=5016.4kbits/s speed=  10x
  
  Last message repeated 152 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:00:55.26 bitrate=4970.9kbits/s speed=  10x
  
  Last message repeated 151 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:00.33 bitrate=4970.6kbits/s speed=  10x
  
  Last message repeated 153 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:05.46 bitrate=4997.3kbits/s speed=  10x
  
  Last message repeated 149 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:10.46 bitrate=5029.6kbits/s speed=  10x
  
  Last message repeated 153 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:15.60 bitrate=5021.0kbits/s speed=  10x
  
  Last message repeated 151 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:20.66 bitrate=5017.6kbits/s speed=  10x
  
  Last message repeated 154 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:25.83 bitrate=4984.3kbits/s speed=10.1x
  
  Last message repeated 151 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:30.90 bitrate=4983.3kbits/s speed=10.1x
  
  Last message repeated 149 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:35.90 bitrate=4985.9kbits/s speed=10.1x
  
  Last message repeated 149 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:40.90 bitrate=4988.3kbits/s speed=  10x
  
  Last message repeated 151 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:45.96 bitrate=5007.0kbits/s speed=10.1x
  
  Last message repeated 150 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:51.00 bitrate=5006.7kbits/s speed=10.1x
  
  Last message repeated 150 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:01:56.03 bitrate=5006.4kbits/s speed=10.1x
  
  Last message repeated 147 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:02:00.96 bitrate=4992.9kbits/s speed=  10x
  
  Last message repeated 151 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:02:06.03 bitrate=4991.9kbits/s speed=  10x
  
  Last message repeated 149 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:02:11.03 bitrate=4993.5kbits/s speed=  10x
  
  Last message repeated 151 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:02:16.10 bitrate=4992.5kbits/s speed=  10x
  
  Last message repeated 153 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:02:21.23 bitrate=4989.2kbits/s speed=10.1x
  
  Last message repeated 152 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:02:26.33 bitrate=4987.3kbits/s speed=10.1x
  
  Last message repeated 149 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:02:31.33 bitrate=5016.5kbits/s speed=  10x
  
  Last message repeated 153 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:02:36.46 bitrate=5026.2kbits/s speed=10.1x
  
  Last message repeated 148 times
  
  [mp4 @ 0000018e11422ec0] pts has no valueB time=00:02:41.43 bitrate=4988.5kbits/s speed=  10x
  
  Last message repeated 15 times
  
  frame= 4862 fps=301 q=-1.0 Lsize=   98882kB time=00:02:41.96 bitrate=5001.3kbits/s speed=  10x
  
  video:98859kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.023950%

• writing simple linux bash program to trim video using ffmpeg [closed]

  12 août 2020, par feri ariyatmoko
  


  1. I know I can trim video using ffmpeg without re-encoding it using this following command :ffmpeg -i 'inputvideo.mp4' -vcodec copy -acodec copy -ss 00:09:33 -to 00:11:53 'output.mp4'

     


  


  2. I've tried that command, it worked like a charm.

     


  


  3. Since I will trim a lot of videos, I think it's better if I have a simple bash program to do it.

     


  


  


  This is what the program should do :

  


  

  1. I use ubuntu, so the program should be written for linux system

  


  2. I execute the program : ./videotrimmer.sh inputvideo.mp4 outputvideo.mp4

  


  3. The program asks the starting time and the time it ends.

  


  4. I enter the times.

  


  5. And done !

  


  


  Example :

  


  

  1. I want to trim the first 3 secs of a 10 secs video named videofile10secs.mp4. The file name of the trimmed video is videofile3secs.mp4

  


  2. ./videotrimmer.sh videofile10secs.mp4 videofile3secs.mp4

  


  3. The program asks the times. I input "00:00:00" and "00:00:03"

  


  4. I press the return key.

  


  5. Done. I should have a new file videofile3secs.mp4.

  


  


  How to write that ? Any help will be highly appreciated.