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• Mix audio input with video to specific location with FFmpeg

  26 septembre 2016, par user2364292

  I created small video editing tool with which you can put some overlay images to the video and show them at specific locations and durations (filter : overlay=enabled(from, to...), etc.).
  Now I also want to add some short audio sounds on the same way like pictures -> adding them to a specific time in the video. That means that overlays and audio sounds should be in one command if possible. I am using amix to merge all sound channels (video.mp4 and sound.mp3) but the thing is that they both start at the beginning. I tried with adelay=1500 but then I actually delay one channel that means I hear duplicate sounds with 1.5 sec delay. So I would like to delay only sound.mp3 input. Am I doing something wrong ?

  My try was that :

  -i video.mp4 -i sound.mp3 -filter_complex amix -preset ultrafast -vcodec libx264 -r 24 -profile:v baseline -threads 14 video_output.mp4

  Thank you very much !

• Time stamps of Transport stream

  27 janvier 2016, par sudheer babu

  I have .ts file which holds 3 videos and 1 audio file. when i played the .ts file, all streams within it are playing at a time. I found there is delay for audio and video streams. How to find how much delay is that ? Any restrictions or limitations or conditions regarding Audio and Videos streams on .ts file

  Please respond if any one have idea on this ...

• FFmpeg on android is crashing in ff_h2645_extract_rbsp function

  6 décembre 2019, par TheWindLaugh

  I have used ffmpeg decode in my decode2 function, it just like this :

  AVPacket pkt;
  
  av_init_packet(&pkt);
  
  pkt.data = (uint8*)vd+16;
  
  pkt.size = vl-16;
  
  m_is_decoding = true;
  
  avcodec_send_packet(m_cctx, &pkt);
  
  int ret = avcodec_receive_frame(m_cctx, m_cfrm);

  Everything works great up until the avcodec_decode_video2 call :

  Build fingerprint: 'HUAWEI/VTR-AL00/HWVTR:9/HUAWEIVTR-AL00/9.1.0.201C00:user/release-keys'
  
  Revision: '0'
  
  cpuAbi/cpuAbi2: 'arm64-v8a#armeabi-v7a#armeabi'
  
  pid: 5829, tid: 6106, name: .myapp.online  >>> com.myapp.online <<<
  
  signal 11 (SIGSEGV), code 2 (SEGV_ACCERR), fault addr 0xcc180000
  
  
  
  backtrace:
  
       #00 pc 0064c098  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp.so (ff_h2645_extract_rbsp+52)
  
       #01 pc 0064c580  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp.so (ff_h2645_packet_split+592)
  
       #02 pc 0037c9e0  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp.so
  
       #03 pc 004e6d18  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp.so (avcodec_decode_video2+380)
  
       #04 pc 004e76a4  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp.so
  
       #05 pc 004eb344  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp.so (avcodec_send_packet+308)
  
       #06 pc 001df578  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp.so (_bio_binder_codec_video_::decode2(void*, yuv_r*, void const*, int)+1384)
  
       #07 pc 002e66b8  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp.so (hm_video_decode_yuv+244)
  
       #08 pc 0003f598  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp_yunguan.so (Device::DecodeVideo()+336)
  
       #09 pc 00037324  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp_yunguan.so (boost::detail::thread_data, boost::_bi::list1 > > >::run()+32)
  
       #10 pc 00046455  /data/app/com.myapp.online-r3eLwyIHdUEbHPM-MUYw1g==/lib/arm/libapp_yunguan.so
  
       #11 pc 00065ac7  /system/lib/libc.so (__pthread_start(void*)+22)
  
       #12 pc 0001e9ad  /system/lib/libc.so (__start_thread+32)