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• Not sure what ffmpeg flags are needed for the proper end result

  13 avril 2016, par shaun

  Using ffmpeg vs stated below.

  ffmpeg version N-76684-g1fe82ab Copyright (c) 2000-2015 the FFmpeg developers
  
  built with gcc 5.2.0 (GCC)

  We are trying to work with some AVIs and convert them to an MP4s changing the audio from pcm_s16le to AAC and keeping the video as h264. However some of our AVIs got encoded wrong and pix_fmt is missing in the ffprobe of the file. We know that the pix_fmt should be yuv420p from the files that got encoded correctly on the same devices.

  If we try to just get the probe info of the avis we get this error right away :

  C:\>ffmpeg -loglevel warning -y -i 1E03004920160411093036001.avi
  
  [avi @ 00000000004d2660] Could not find codec parameters for stream 0 (Video: h264 (H264 / 0x34363248), none, 720x480, 501 kb/s): unspecified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Guessed Channel Layout for  Input Stream #0.1 : mono

  So we tried to specify the pix_fmt of the incoming AVI so it would play nicely however all we get is this error :

  C:\>ffmpeg -loglevel warning -y -pix_fmt yuv420p -i 1E03004920160411093036001.avi
  
  Option pixel_format not found.

  Our long term goal is to convert them just like :

  ffmpeg -y -i 1E03004920160411093036001.avi -c:v copy -c:a aac -strict -2 -movflags +faststart 1E03004920160411093036001.mp4

  OR

  ffmpeg -y -i 1E03004920160411093036001.avi -c:v copy -c:a libfdk_aac -b:a 41k -movflags +faststart 1E03004920160411093036001.mp4

  Just like every other video of ours however we keep running into one of these two errors.

  Currently this is bypassed using mencoder :

  mencoder -idx 1E03004920160411093036001.avi -ovc copy -oac copy -o 1E03004920160411093036001-a.avi

  But we would like to get away from this interim step and just tell all our files what pix_fmt to use no matter what. Is there any way to do this ?

  2Mb AVI

• FFMpeg avcodec_decode_video2 no result for first frame

  23 décembre 2015, par Max Plakhuta

  I’m trying to play video from my archive. Playing is OK except very first frame : got_picture_ptr is setting to 0. And starting from 2nd frame everything is ok. Because of this I can’t retreive an image when seeking with timeline. Frame size is same in send from archive function and in decode function. Why decoding may fail ?

  AVPacket packet;
  
      av_init_packet(&packet);
  
      packet.data = (uint8_t*) frame->data;
  
      packet.size = frame->size;
  
      int decode_count = 0;
  
      bool pushed = false;
  
  //  while(av_read_frame(formatContext, &packet) >= 0) {
  
          //decode_ret = avcodec_decode_video2(codec_context, pFrame, &got_picture, &packet);
  
      //}
  
      LOGDEBUG("Frame len: %d", packet.size);
  
      while (packet.size > 0) {
  
          decode_count++;
  
          int got_picture;
  
          int decode_ret = 0;
  
  //      LOGDEBUG("Decoding [%d] (%d/%d, %d/%d) %d", getDecoderId(), codec_context->width, width, codec_context->height, height, packet.size);
  
  
  
          try {
  
              decode_ret = avcodec_decode_video2(codec_context, pFrame, &got_picture, &packet);
  
              LOGDEBUG("Decoding frame size decode_ret: %d, got_picture: %d, width: %d, height: %d", decode_ret, got_picture, codec_context->width, codec_context->height);
  
              decoded_frame_number = frame->index;
  
              if (decode_ret < 0) {
  
                  LOGDEBUG("Decoding error %d", decode_ret);
  
                  return false;
  
              }
  
          } catch (...) {
  
              LOGDEBUG("Error decoding");
  
              return false;
  
          }
  
          if (packet.data) {
  
              packet.size -= decode_ret;
  
              packet.data += decode_ret;
  
          }
  
          if (!got_picture) {
  
              LOGDEBUG("Waiting for full picture");
  
              std::string packet_flags = "";
  
              if (packet.flags & AV_PKT_FLAG_KEY) {
  
                  packet_flags += "AV_PKT_FLAG_KEY";
  
              }
  
              if (packet.flags & AV_PKT_FLAG_CORRUPT) {
  
                  packet_flags += " | AV_PKT_FLAG_CORRUPT";
  
              }
  
  //          LOGDEBUG("Decoding %d frame[%ld] not complete (%d, %d) flags %s packetsize %d/%d keyframe %d for %d",
  
  //                  decode_ret, frame->index, codec_context->width,
  
  //                  codec_context->height, packet_flags.c_str(), packet.size, frame->size,
  
  //                  pFrame->key_frame, decode_count);
  
              continue;
  
          }

  Here is my full function : http://pastebin.com/TekkZEUa

  P.S. codec context width and height is 0 after decoding first frame.

• avcodec/mediacodecenc : Check fifo write result and simplify fifo operation

  4 décembre 2024, par Zhao Zhili

  avcodec/mediacodecenc : Check fifo write result and simplify fifo operation
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  
  Reviewed-by : Anton Khirnov <anton@khirnov.net>
  

  • [DH] libavcodec/mediacodecenc.c