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• Is there any Android lib that can be used to split mp4 files in the GOP dimension ?

  11 décembre 2024, par Chaojie Mo

  An mp4 file consists of meta information and a set of GOPs. Now i want to split mp4 files in the GOP dimension and then every GOP with meta information is recombined into a new file. Is there any feasible solution ?

  


• Hardware acceleration RPI4 FFmpeg

  10 avril 2020, par Roman Honcharenko

  I'm trying to get to work hardware acceleration on my Raspberry pi 4-64. I'm using FFmpeg and AFAIK hwaccel can be reached by using OpenMAX or V4L2-M2M.
After '—enable-omx' and 'enable-omx-rpi' for FFmpeg, build fails with error : 'OMX_Core.h not found'. If I will provide manually omx headers, then it will compile but FFmpeg encoding will fail due to missing libraries : bcm_host.so and libopenmaxil.so

  



  I have tried reverting to userland by DISABLE_VC4GRAPHICS = "1", it produced bcm_host.so, but not libopenmaxil.so. I have tried different combinations of virtual providers and graphics settings but without success.
Is it possible to access omx hardware acceleration on RPI4-64 ?

  



  Steps to reproduce the issue :

  



  1.Download latest Poky distro, meta-openembedded, meta-raspberrypi

  



  2.Enable omx, omx-rpi support for FFmpeg

  



  3.Link headers for FFmpeg

  



  4.Build and try to use h264_omx

  



  How do I get missing library libopenmaxil.so and everything I need for hwaccel ?

  



  poky master : commit 5d47cdf448b6cff5bb7cc5b0ba0426b8235ec478

  



  meta-openembedded master : commit daa50331352c1f75da3a8ef6458ae3ddf94ef863

  



  meta-raspberrypi master : commit 8d163dd

  



  BTW, by using V4L2-M2M, I'm getting green shadows on the resulting video. Maybe can someone point me in the right direction ?

  


• FFMPEG streaming error : Failed to update header with correct filesize and duration

  9 septembre 2020, par Brindha Kanniah

  I am trying to stream an mp4 to a vlc player on my local computer at ip address 127.0.0.1:48550, but am encountering this error.

  



  Failed to update header with correct duration.
Failed to update header with correct filesize.


  



  I didn't have this problem when streaming on my mac, but am encountering it with a Windows pc.

  



  On my mac I am running ffmpeg 3.2.4, and on the pc, ffmpeg version N-86755-g0780ad9 built with gcc 7.1.0.

  



  Below is the VLC media player debug log :

  



  core debug: adding item `udp://127.0.0.1:48550' ( udp://127.0.0.1:48550 )
core debug: processing request item: udp://127.0.0.1:48550, node: null, skip: 0
core debug: rebuilding array of current - root Playlist
core debug: rebuild done - 1 items, index 0
core debug: starting playback of the new playlist item
core debug: resyncing on udp://127.0.0.1:48550
core debug: udp://127.0.0.1:48550 is at 0
core debug: creating new input thread
core debug: Creating an input for 'udp://127.0.0.1:48550'
core debug: meta ok for (null), need to fetch art
core debug: requesting art for udp://127.0.0.1:48550
core debug: looking for meta fetcher module matching "any": 1 candidates
core debug: using timeshift granularity of 50 MiB, in path 'C:\Users\Oculus\AppData\Local\Temp'
core debug: looking for meta fetcher module matching "any": 1 candidates
core debug: `udp://127.0.0.1:48550' gives access `udp' demux `' path `127.0.0.1:48550'
core debug: specified demux `any'
core debug: creating demux: access='udp' demux='any' location='127.0.0.1:48550' file='\\127.0.0.1:48550'
core debug: looking for access_demux module matching "udp": 12 candidates
core debug: no access_demux modules matched
core debug: creating access 'udp' location='127.0.0.1:48550', path='\\127.0.0.1:48550'
core debug: looking for access module matching "udp": 21 candidates
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\fetcher
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\fetcher
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
udp debug: opening server=127.0.0.1:48550 local=:1234
core debug: net: connecting to [127.0.0.1]:48550 from []:1234
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
core debug: no meta fetcher modules matched
core debug: searching art for udp://127.0.0.1:48550
core debug: looking for art finder module matching "any": 2 candidates
core debug: no meta fetcher modules matched
core debug: searching art for udp://127.0.0.1:48550
core debug: looking for art finder module matching "any": 2 candidates
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\art
lua debug: Trying Lua scripts in C:\Users\Oculus\AppData\Roaming\vlc\lua\meta\art
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\art
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\art
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
lua debug: skipping script (unmatched scope) C:\Program Files\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
core debug: no art finder modules matched
core debug: art not found for udp://127.0.0.1:48550
core debug: no art finder modules matched
core debug: art not found for udp://127.0.0.1:48550
core debug: using access module "udp"
core debug: Using block method for AStream*
core debug: starting pre-buffering
qt4 debug: IM: Setting an input


  



  Thoughts on why this is happening ? And on how to resolve this ?