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• failed to run ffmpeg player on android

  14 juin 2014, par Hogun

  I get source from AndroidFFmpeg.
  and I succeeded to build FFmpegLibrary project and FFmpegExample.
  When I installed a app on G2 phone, ran the app well.
  but when I installed it on Galaxy S3, the app is killed by failed ffmpeg-neon.so load.
  

  I have environments blow,

  • Ubuntu 12.04 LTS 64bit
  • Android NDK r9d
  • Android Toolchain 4.6
  • FFmpeg 2.2

  06-14 16:22:05.181: D/dalvikvm(26430): Trying to load lib /data/app-lib/com.example.ffmpegbasic-1/libnativetester-jni.so 0x42dbfb58
  
  06-14 16:22:05.181: D/dalvikvm(26430): Added shared lib /data/app-lib/com.example.ffmpegbasic-1/libnativetester-jni.so 0x42dbfb58
  
  06-14 16:22:05.181: D/dalvikvm(26430): Trying to load lib /data/app-lib/com.example.ffmpegbasic-1/libffmpeg-neon.so 0x42dbfb58
  
  06-14 16:22:05.186: A/libc(26430): Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 26430 (ple.ffmpegbasic)

  and i also try on android toolchain 4.8 but i see the same error.
  What do i try now ? Help me please...
  

• How to identify exact type or variation of a .mp4 file

  5 octobre 2017, par Dave502619

  Can anyone tell me if there are different variations of mp4 file and if so, how to identify the exact type or variation of a mp4 file ?

  The reason I need to know this is if I pass an .mp4 through FFMPEG to create an uncompressed grayscale rgb24 avi file, depending on
  where the .mp4 file has been sourced from will produce a different internally structured avi file as output from FFMPEG. Ie, the file header
  and interframe header sizes differ.

  The ffmpeg command i am using is :
  ffmpeg.exe -i source.mp4 -b 1150 -r 20.97 -g 120 -an -vf format=gray -f rawvideo -pixfmt rgb24 -s 384x216 -vcode rawvideo -y fileX.avi

  So far I have identified that .mp4 files generated by my Samsung S5 mobile phone differ from .mp4 files generated by Power Director 14. So I suspect there are different variations of .mp4 files.

  I have written some software which steps into the FFMPEG output .avi file to extract video frames, but it requires fixed offset positions to work so I can only make it work for one variation of .mp4.

• ffmpeg on rasbian to rtmd server - no output

  5 mai 2020, par TwoSeven

  I have set up a nginx-rtmd server on a raspberry pi and am using it to output to obs. I can successfully stream from my GoPro 7 and pick up the output on VLC on my phone.

  



  I have set up a pi camera on another rpi and using raspivd I can see the camera video in a window on a small touch display attached to it.

  



  I have set up ffmpeg with h264/aac support and piped the output of raspivid into it. Apart from a warning saying cur_dts is invalid, ffmpeg appears to be running (the output says 100k frames so far).

  



  The issue is that I get no output in VLC (just a spinning icon) when I try and connect to the nginx-rtmp server. I do still get the video window on the rpi screen (which is unexpected).

  



  The command I am using is

  



  raspivid -o - -t 0 -w 1920 -h 1080 -fps 25 -b 4000000 -g 50 | ./ffmpeg -loglevel debug -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://<address>/<app>/<fname>&#xA;</fname></app></address>

  



  does anyone have any pointers as to what might be incorrect. I am not so familiar with ffmpeg other than a cursory understanding of the parameters and what it does.

  



  Regards.