Happy New Year! Can any libav experts have a look on the quality of streaming issue I am facing?
Thanks Benji On Wed, Dec 27, 2017 at 1:12 PM, Benji Amello <[email protected]> wrote: > Any help is much appreciated > > On Mon, Dec 25, 2017 at 6:13 PM, Benji Amello <[email protected]> > wrote: >> >> Hi, >> >> I am struggling with issue for past 2 weeks & making almost no progress. >> I am trying to do codec copy of a stream(testing with file & later >> going to use live stream) with format rtp_mpegts over network & play >> using VLC player. Started my proof of concept code with slightly >> modified remuxing.c in the examples. >> >> >> I am essentially trying to do is to replicate >> ./ffmpeg -re -i TEST_VIDEO.ts -acodec copy -vcodec copy -f rtp_mpegts >> rtp://239.245.0.2:5002 >> >> Streaming is happening, but the quality is terrible. >> Looks like many frames are skipped plus streaming is happening really >> slow(buffer underflow reported by VLC player) >> >> File plays perfectly fine directly on VLC player. >> Please help. >> >> Stream details. >> Input #0, mpegts, from ' TEST_VIDEO.ts': >> Duration: 00:10:00.40, start: 41313.400811, bitrate: 2840 kb/s >> Program 1 >> Stream #0:0[0x11]: Video: h264 (High) ([27][0][0][0] / 0x001B), >> yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], 29.97 >> fps, 59.94 tbr, 90k tbn, 59.94 tbc >> Stream #0:1[0x14]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, >> stereo, fltp, 448 kb/s >> Output #0, rtp_mpegts, to 'rtp://239.255.0.2:5004': >> Metadata: >> encoder : Lavf57.83.100 >> Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), >> yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], q=2-31, >> 29.97 fps, 59.94 tbr, 90k tbn, 29.97 tbc >> Stream #0:1: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, >> fltp, 448 kb/s >> Stream mapping: >> Stream #0:0 -> #0:0 (copy) >> Stream #0:1 -> #0:1 (copy) >> Press [q] to stop, [?] for help >> frame= 418 fps=5.2 q=-1.0 size= 3346kB time=00:00:08.50 >> bitrate=3223.5kbits/s speed=0.106x >> Thanks >> Benji >> >> >> My complete source code(This is almost same as remuxing.c) >> >> >> #include <libavutil/timestamp.h> >> #include <libavformat/avformat.h> >> >> static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket >> *pkt, const char *tag) >> { >> AVRational *time_base = >> &fmt_ctx->streams[pkt->stream_index]->time_base; >> >> printf("%s: pts:%s pts_time:%s dts:%s dts_time:%s duration:%s >> duration_time:%s stream_index:%d\n", >> tag, >> av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base), >> av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base), >> av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, >> time_base), >> pkt->stream_index); >> } >> >> >> int main(int argc, char **argv) >> { >> AVOutputFormat *ofmt = NULL; >> AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL; >> AVPacket pkt; >> const char *in_filename, *out_filename; >> int ret, i; >> int stream_index = 0; >> int *stream_mapping = NULL; >> int stream_mapping_size = 0; >> AVRational mux_timebase; >> int64_t start_time = 0; //(of->start_time == AV_NOPTS_VALUE) ? 0 : >> of->start_time; >> int64_t ost_tb_start_time = 0; //av_rescale_q(start_time, >> AV_TIME_BASE_Q, ost->mux_timebase); >> >> if (argc < 3) { >> printf("usage: %s input output\n" >> "API example program to remux a media file with >> libavformat and libavcodec.\n" >> "The output format is guessed according to the file >> extension.\n" >> "\n", argv[0]); >> return 1; >> } >> >> in_filename = argv[1]; >> out_filename = argv[2]; >> >> av_register_all(); >> avcodec_register_all(); >> avformat_network_init(); >> >> 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); >> >> avformat_alloc_output_context2(&ofmt_ctx, NULL, "rtp_mpegts", >> out_filename); >> if (!ofmt_ctx) { >> fprintf(stderr, "Could not create output context\n"); >> ret = AVERROR_UNKNOWN; >> goto end; >> } >> >> stream_mapping_size = ifmt_ctx->nb_streams; >> stream_mapping = av_mallocz_array(stream_mapping_size, >> sizeof(*stream_mapping)); >> if (!stream_mapping) { >> ret = AVERROR(ENOMEM); >> goto end; >> } >> >> ofmt = ofmt_ctx->oformat; >> >> for (i = 0; i < ifmt_ctx->nb_streams; i++) >> { >> AVStream *out_stream; >> AVStream *in_stream = ifmt_ctx->streams[i]; >> AVCodecParameters *in_codecpar = in_stream->codecpar; >> >> if (in_codecpar->codec_type != AVMEDIA_TYPE_AUDIO && >> in_codecpar->codec_type != AVMEDIA_TYPE_VIDEO && >> in_codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) { >> stream_mapping[i] = -1; >> continue; >> } >> >> stream_mapping[i] = stream_index++; >> >> >> out_stream = avformat_new_stream(ofmt_ctx, NULL); >> if (!out_stream) { >> fprintf(stderr, "Failed allocating output stream\n"); >> ret = AVERROR_UNKNOWN; >> goto end; >> } >> >> //out_stream->codecpar->codec_tag = 0; >> if (0 == out_stream->codecpar->codec_tag) >> { >> unsigned int codec_tag_tmp; >> >> if (!out_stream->codecpar->codec_tag || >> av_codec_get_id (ofmt->codec_tag, >> in_codecpar->codec_tag) == in_codecpar->codec_id || >> !av_codec_get_tag2(ofmt->codec_tag, >> in_codecpar->codec_id, &codec_tag_tmp)) >> out_stream->codecpar->codec_tag = in_codecpar->codec_tag; >> } >> //ret = avcodec_parameters_to_context(ost->enc_ctx, >> ist->st->codecpar); >> >> ret = avcodec_parameters_copy(out_stream->codecpar, in_codecpar); >> if (ret < 0) { >> fprintf(stderr, "Failed to copy codec parameters\n"); >> goto end; >> } >> //out_stream->codecpar->codec_tag = codec_tag; >> // copy timebase while removing common factors >> >> printf("bit_rate %lld sample_rate %d frame_size %d\n", >> in_codecpar->bit_rate, in_codecpar->sample_rate, >> in_codecpar->frame_size); >> >> out_stream->avg_frame_rate = in_stream->avg_frame_rate; >> >> ret = avformat_transfer_internal_stream_timing_info(ofmt, >> >> out_stream, in_stream, >> >> AVFMT_TBCF_AUTO); >> if (ret < 0) { >> fprintf(stderr, >> "avformat_transfer_internal_stream_timing_info failed\n"); >> goto end; >> } >> >> if (out_stream->time_base.num <= 0 || out_stream->time_base.den <= >> 0) >> out_stream->time_base = >> av_add_q(av_stream_get_codec_timebase(out_stream), (AVRational){0, >> 1}); >> >> // copy estimated duration as a hint to the muxer >> if (out_stream->duration <= 0 && in_stream->duration > 0) >> out_stream->duration = av_rescale_q(in_stream->duration, >> in_stream->time_base, out_stream->time_base); >> >> // copy disposition >> out_stream->disposition = in_stream->disposition; >> >> out_stream->sample_aspect_ratio = in_stream->sample_aspect_ratio; >> out_stream->avg_frame_rate = in_stream->avg_frame_rate; >> out_stream->r_frame_rate = in_stream->r_frame_rate; >> >> if ( in_codecpar->codec_type == AVMEDIA_TYPE_VIDEO) >> { >> >> mux_timebase = in_stream->time_base; >> } >> >> >> if (in_stream->nb_side_data) { >> for (i = 0; i < in_stream->nb_side_data; i++) { >> const AVPacketSideData *sd_src = &in_stream->side_data[i]; >> uint8_t *dst_data; >> >> dst_data = av_stream_new_side_data(out_stream, >> sd_src->type, sd_src->size); >> if (!dst_data) >> return AVERROR(ENOMEM); >> memcpy(dst_data, sd_src->data, sd_src->size); >> } >> } >> } >> >> av_dump_format(ofmt_ctx, 0, out_filename, 1); >> >> start_time = ofmt_ctx->duration; >> ost_tb_start_time = av_rescale_q(ofmt_ctx->duration, >> AV_TIME_BASE_Q, mux_timebase); >> >> if (!(ofmt->flags & AVFMT_NOFILE)) >> { >> ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE); >> if (ret < 0) { >> fprintf(stderr, "Could not open output file '%s'", >> out_filename); >> goto end; >> } >> } >> >> ret = avformat_write_header(ofmt_ctx, NULL); >> if (ret < 0) { >> fprintf(stderr, "Error occurred when opening output file\n"); >> goto end; >> } >> >> while (1) >> { >> AVStream *in_stream, *out_stream; >> >> ret = av_read_frame(ifmt_ctx, &pkt); >> if (ret < 0) >> break; >> >> in_stream = ifmt_ctx->streams[pkt.stream_index]; >> if (pkt.stream_index >= stream_mapping_size || >> stream_mapping[pkt.stream_index] < 0) { >> av_packet_unref(&pkt); >> continue; >> } >> >> pkt.stream_index = stream_mapping[pkt.stream_index]; >> out_stream = ofmt_ctx->streams[pkt.stream_index]; >> >> //log_packet(ifmt_ctx, &pkt, "in"); >> >> >> //ofmt_ctx->bit_rate = ifmt_ctx->bit_rate; >> ofmt_ctx->duration = ifmt_ctx->duration; >> /* copy packet */ >> //pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, >> out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX); >> //pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, >> out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX); >> >> if (pkt.pts != AV_NOPTS_VALUE) >> pkt.pts = av_rescale_q(pkt.pts, >> in_stream->time_base,mux_timebase) - ost_tb_start_time; >> else >> pkt.pts = AV_NOPTS_VALUE; >> >> if (pkt.dts == AV_NOPTS_VALUE) >> pkt.dts = av_rescale_q(pkt.dts, AV_TIME_BASE_Q, mux_timebase); >> else >> pkt.dts = av_rescale_q(pkt.dts, in_stream->time_base, >> mux_timebase); >> pkt.dts -= ost_tb_start_time; >> >> pkt.duration = av_rescale_q(pkt.duration, >> in_stream->time_base, mux_timebase); >> //pkt.duration = av_rescale_q(1, >> av_inv_q(out_stream->avg_frame_rate), mux_timebase); >> pkt.pos = -1; >> //log_packet(ofmt_ctx, &pkt, "out"); >> >> >> ret = av_interleaved_write_frame(ofmt_ctx, &pkt); >> if (ret < 0) { >> fprintf(stderr, "Error muxing packet\n"); >> break; >> } >> av_packet_unref(&pkt); >> } >> >> av_write_trailer(ofmt_ctx); >> end: >> >> avformat_close_input(&ifmt_ctx); >> >> /* close output */ >> if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE)) >> avio_closep(&ofmt_ctx->pb); >> avformat_free_context(ofmt_ctx); >> >> av_freep(&stream_mapping); >> >> if (ret < 0 && ret != AVERROR_EOF) { >> fprintf(stderr, "Error occurred: %s\n", av_err2str(ret)); >> return 1; >> } >> >> return 0; >> } >> _______________________________________________ >> Libav-user mailing list >> [email protected] >> http://ffmpeg.org/mailman/listinfo/libav-user > > > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
