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  1. Member
    Join Date
    Aug 2019
    Location
    USA
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    New to ffmpeg and playing around that to understand better. I'm trying to use ffmpeg code base to get TS packets from a HLS Streaming server. I don't need any decoding as I just have to store the TS packets to be processed later.

    First I built a minimal FFMPEG as outlined in https://ffmpeg.zeranoe.com/forum/viewto ... f=5&t=7426. No decoders and only hls and mpegts demuxers. Then using the following code to receive the frames. While inspecting it doesn't seem to be MPEG-TS packets while looking into buffers thru GDB. Attaching the code here..

    Two Questions:
    1. Shouldn't the av_recv_frame get me the TS packets? However When I trace all the way to playlists (off HLSContext), the read_buffer there contains TS packets. IS there any example I could look into to get TS packets in this scenario without decoders?

    2. If I get answer for (1), How to get the best stream off the HLS server? when looking into ffplay, av_find_best_stream() sounds like the one to look into.. But again without needing to decode, is there a way to get best one according to the network condition?

    Thanks..


    int main(int argc, char *argv[])
    {
    AVFormatContext * ifmt_ctx = NULL;
    char *in_filename = NULL;
    int ret = 0;
    AVPacket pkt;

    if (argc != 2)
    {
    return 1;
    }
    in_filename = argv[1];

    av_register_all();


    if (!(ifmt_ctx = avformat_alloc_context())) {
    goto end;
    }
    if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0)
    {
    fprintf(stderr, "Could not open input file '%s'", in_filename);
    goto end;

    }

    if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0)
    {
    fprintf(stderr, "Failed to retrieve input stream information");
    goto end;

    }


    av_dump_format(ifmt_ctx, 0, in_filename, 0);

    while (1)
    {

    ret = av_read_frame(ifmt_ctx, &pkt);
    if (ret < 0)
    break;

    av_free_packet(&pkt);

    }


    end:

    avformat_close_input(&ifmt_ctx);
    return 0;
    }
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  2. Member
    Join Date
    Aug 2019
    Location
    USA
    Search PM
    Got more info. What gets returned from av_recv_frame is either Audio/Video stream from the HLS server. Also its not given as TS packets.

    So my question should have been how to get TS packets as is given an input url.
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