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  • How can I figure out the optimized number of parallel running encoding jobs with the x264 encoder library

    30 janvier 2024, par Dani

    I'm batch converting hundreds of videos to mp4 and trying to optimize my method.

    



    I have written a node script, which spawns FFMPEG processes to convert the videos.

    



    From my understanding both FFMPEG and the libx264 encoder are already optimized for multithreaded support. I'm using the default threading option in the encoder.

    



    I'm trying to find the optimal number of FFMPEG spawned processes I should make. There seems to be a balance between having too many and slowing down the encoding of all jobs vs too few process going through the job queue too slowly.

    



    I'm also wondering if dedicating a specific number of threads to each encode job would help rather than using the default setting ?

    



    For my setup I'm on a dated 12-core Mac Pro with 24-threads, though this question is about finding the optimal balance in general.

    


  • FFMpeg undefined reference to get_buffer

    14 juin 2012, par Kevin

    I'm trying to upgrade the FFMpeg source used with one of our projects but get_buffer has gone away. I'm not 100% sure on which method to replace it with. Here are two contexts in which its used, any help is appreciated.

    I look forward to hearing from you soon,

    Thanks,
    Kevin

        cur_offset = avio_tell(pb);
    
    if (!para->playctrl_info.read_end_flag && (0 == pkt->data_size)) {
    
        rev_byte = get_buffer(pb, pbuf, para->max_raw_size);
    
        if ((rev_byte > 0) && (cur_offset <= para->pFormatCtx->data_offset)) {
    
            try_count = 0;
    
            pkt->data_size = rev_byte;
    
            para->read_size.total_bytes += rev_byte;
    
            pkt->avpkt_newflag = 1;
    
            pkt->avpkt_isvalid = 1;
    

    
  do {
    
                read_length = get_buffer(s->pb, data + 12, read_size);
    
                if ((read_length <= 0) || (sync_flag == 1024)) {
    
                    if (read_length == AVERROR(EAGAIN)) {
    
                        continue;
    
                    } else {
    
                        FREE(data);
    
                        log_error("[%s]get data failed. ret=%d\n", __FUNCTION__, read_length);
    
                        return 0;
    
                    }
    
                } else {
    
                    break;
    
                }
    
            } while (retry_get_data < am_p->playctrl_info.read_max_retry_cnt);
    
            pkt = data;

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