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• FFMPEG demuxer seek error in Chrome range slider with AWS S3 audio file

  4 avril, par Tania Rascia

  I'm encountering an issue where if you click or slide enough on a range slider in Chrome, it will eventually stop working and give this error, an error 2 (network error) :

  


  PIPELINE_ERROR_READ: FFmpegDemuxer: demuxer seek failed


  


  If I google this error, I only find the Chrome source code :

  


  Line 1749 of Chrome source code

  


  First, this issue only happens in Chrome, not Firefox. Second, I can only get it to happen with an encrypted file from AWS, which I can't get into a sandbox, so the sandbox I made will never encounter that error with the random audio file I used.

  


  Here's the sandbox.

  


  The only difference I can find between this code and the failing code is the source of the audio file (AWS S3).

  


• Why can't I seek using PTS while reading an MXF file until av_write_trailer() is called ?

  1er mai, par Summit

  I'm writing an MXF file using FFmpeg in C++ and then reading it back for real-time playback. However, I'm running into a problem : seeking by PTS (av_seek_frame()) doesn't work properly until I call av_write_trailer() at the end of the writing session.

  


  Here’s the workflow :

  


  I'm encoding and writing frames to an MXF file using avformat_write_header() and av_interleaved_write_frame().

  


  I want to read from the same file while it’s still being written (like a growing file or EVS-style live playback).

  


  But seeking using av_seek_frame() to a specific PTS fails or behaves incorrectly until I finalize the file with av_write_trailer().

  


  Here is a simplified version of my writing logic :

  


  avformat_write_header(formatContext, nullptr);
// ... loop ...
avcodec_send_frame(codecContext, frame);
avcodec_receive_packet(codecContext, &pkt);
av_interleaved_write_frame(formatContext, &pkt);
// NO call to av_write_trailer() yet


  


  And this is how I try to seek in the reading logic :

  


  av_seek_frame(inputFormatContext, videoStreamIndex, targetPts, AVSEEK_FLAG_BACKWARD);


  


• phplondon conference 2008

  9 juin 2010, par Mikko Koppanen — Everything else, Imagick, PHP stuff, phplondon08

  To summarize it : I had fun My conference preparations started about two weeks before the conference. The PHPLondon fellows (Paul, Matt and Richard) asked me to do a small presentation about Imagick at the pre-conference social event. The presentation I assembled ended up being a little over two hours, give or take. The hardest part was to trim down from two hours to about 40 minutes (I didn’t want to bore the people with too many code examples). The slides are available at http://valokuva.org/talks if you need them for some reason.

  My conference day was pretty hectic from the beginning to the end. I gave a few demos about the products that we represent and the moment I opened my mouth for the first time people started leaving the room. I hope that it had something to do with the “My Framework is better than yours ?” talk starting at the same time

  I met quite a lot of new people at the conference and of course it was nice to see the familiar faces from other conferences and PHPLondon meetings. I was especially happy that I was able to answer the questions Nigel James had

  A huge thanks to the organizers for making this day possible !