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  • Trying to fix VPlayer's seeking ability, need some guidance [Android FFmpeg]

    1er juin 2016, par vxh.viet

    I’m trying to fix the currently broken seeking ability of VPlayer which is a FFmpeg player for Android. Being a Java developer, C code looks like alien language to me so can only fix it using common logic (which could make any C veteran have a good laugh).

    The relevant file is player.c and I’ll try my best to point out the relevant modification.

    So the basic idea is because FFmpeg’s av_seek_frame is very inaccurate even with AVSEEK_FLAG_ANY so I’m trying to follow this suggestion to seek backward to the nearest keyframe and then decode to the frame I want. One addition note is since I want to seek based on millisecond while the said solution show the way to seek by frame which is potentially a source of problem.

    In the Player I add the following fields :

    struct Player{
    
....
    
AVFrame *frame;
    
int64_t current_time_stamp;
    
};

    In the player_read_from_stream I modify the seeking part as :

    void * player_read_from_stream(void *data) {
    
    ...
    
    struct DecoderData *decoder_data = data;
    
    int stream_no = decoder_data->stream_no;
    
    AVCodecContext * ctx = player->input_codec_ctxs[stream_no];
    
    ...
    
    // seeking, start my stuff
    
    if(av_seek_frame(player->input_format_ctx, seek_input_stream_number, seek_target, AVSEEK_FLAG_BACKWARD) >= 0){
    
        //seek to key frame success, now need to read every frame from the key frame to our target time stamp
    

    

    
        while(player->current_time_stamp < seek_target){
    

    
            int frame_done;
    

    
            while (av_read_frame(player->input_format_ctx, &packet) >= 0) {
    
                if (packet.stream_index == seek_input_stream_number) {
    

    
                    avcodec_decode_video2(ctx, player->frame, &frame_done, &packet);
    
                    LOGI(1,"testing_stuff ctx %d", *ctx);
    
                    if (frame_done) {
    

    
                        player->current_time_stamp = packet.dts;
    
                        LOGI(1,"testing_stuff current_time_stamp: %"PRId64, player->current_time_stamp);
    
                        av_free_packet(&packet);
    
                        return;
    
                    }
    
                }
    
                av_free_packet(&packet);
    
            }
    
        }
    

    

    
    }
    
    //end my stuff
    

    
    LOGI(3, "player_read_from_stream seeking success");
    

    
    int64_t current_time = av_gettime();
    
    player->start_time = current_time - player->seek_position;
    
    player->pause_time = current_time;        
    
}

    And in player_alloc_frames I allocate the memory for my frame as :

    int player_alloc_frames(struct Player *player) {
    
    int capture_streams_no = player->caputre_streams_no;
    
    int stream_no;
    
    for (stream_no = 0; stream_no < capture_streams_no; ++stream_no) {
    
        player->input_frames[stream_no] = av_frame_alloc();
    

    
        //todo: test my stuff
    
        player->frame = av_frame_alloc();
    
        //end test
    

    
        if (player->input_frames[stream_no] == NULL) {
    
            return -ERROR_COULD_NOT_ALLOC_FRAME;
    
        }
    
    }
    
    return 0;
    
}

    Currently it just keep crashing and being a typical Android NDK’s "feature", it just provide a super helpful stack trace :

    libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x40 in tid 2717 (FFmpegReadFromS)

    I very much appreciate if anyone could help me solve this problem. Thank you for your time.

  • rtpdec : experimental VP9 depacketizer (draft 0)

    4 mars 2015, par Thomas Volkert
    rtpdec : experimental VP9 depacketizer (draft 0)

    The code was tested with live555 server.
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DH] Changelog
    • [DH] libavformat/Makefile
    • [DH] libavformat/rtpdec.c
    • [DH] libavformat/rtpdec_formats.h
    • [DH] libavformat/rtpdec_vp9.c
    • [DH] libavformat/version.h

  • rtpdec : experimental VP9 depacketizer (draft 0)

    15 février 2015, par Thomas Volkert
    rtpdec : experimental VP9 depacketizer (draft 0)

    Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] Changelog
    • [DH] MAINTAINERS
    • [DH] libavformat/Makefile
    • [DH] libavformat/rtpdec.c
    • [DH] libavformat/rtpdec_formats.h
    • [DH] libavformat/rtpdec_vp9.c

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