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Valkaama DVD Cover Outside
4 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Image
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Valkaama DVD Label
4 octobre 2011, par
Mis à jour : Février 2013
Langue : English
Type : Image
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Valkaama DVD Cover Inside
4 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Image
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1,000,000
27 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Demon Seed
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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The Four of Us are Dying
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Sur d’autres sites (11527)
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VLC huge buffering times over rtp for local H264 stream
15 mars 2022, par mikeI'm outputting an H264 stream, encoded by my application using ffmpeg. I can display it using
ffplay
, but when trying to view the stream in VLC, I only get the first frame, or it looks like that's the case.

The messages output shows that it is "buffering", taking around a minute to get to 100% when the frame updates.
When using
ffplay
, the latency is about 50-100ms at worst.

I am sending to
rtp://127.0.0.1:6666?pkt_size=1316
with the formatrtp_mpegts
.
I am new to this and it's highly likely I haven't set the frame up completely correctly. The process is (minus declarations and error checking)

codec_name = "libx264";
codec = avcodec_find_encoder_by_name(codec_name.c_str());
context = avcodec_alloc_context3(codec);
pkt = av_packet_alloc();
context->bit_rate = 5 * Mega;
context->width = info.DisplayWidth;
context->height = info.DisplayHeight;
context->time_base = { 1, FPS };
context->framerate = { FPS, 1 };
context->gop_size = 100;
context->max_b_frames = 1; 
context->pix_fmt = AV_PIX_FMT_YUV420P;
if (codec->id == AV_CODEC_ID_H264)
 {
 check_ret("set option: preset", av_opt_set(context->priv_data, "preset", "fast", 0));
 check_ret("set option: tune", av_opt_set(context->priv_data, "tune", "zerolatency", 0));
 check_ret("set option: profile", av_opt_set(context->priv_data, "profile", "baseline", 0)); 
 }
check_ret("open codec", avcodec_open2(context, codec, NULL));

// setup the stream 
fmt = (AVOutputFormat*)av_guess_format("rtp_mpegts", NULL, NULL);

avformat_alloc_output_context2(&avfctx, fmt, fmt->name,
 "rtp://127.0.0.1:6666?pkt_size=1316"); 
 
avio_open(&avfctx->pb, avfctx->url, AVIO_FLAG_WRITE);
AVStream* stream = avformat_new_stream(avfctx, codec);
avcodec_parameters_from_context(stream->codecpar, context);
stream->time_base.num = 1;
stream->time_base.den = FPS;
avformat_write_header(avfctx, NULL);

// then the encoding (in an output loop)
<not get="get" frame="frame" from="from" rgba="rgba" to="to" yuv="yuv">
yuvFrame->pts = i++; // i is incremented every frame
avcodec_send_frame(enc_ctx, yuvFrame);
 while (ret >= 0) {
 ret = avcodec_receive_packet(enc_ctx, pkt); 
 //ret = av_interleaved_write_frame(avfctx, pkt); was using this, don't seem to need it
 ret = av_write_frame(avfctx, pkt);
 av_packet_unref(pkt);
}
</not>


The VLC output looks like this :


main debug: using hw decoder module "d3d11va"
avcodec info: Using D3D11VA (NVIDIA GeForce RTX 2080 Super with Max-Q Design, vendor 10de(NVIDIA), device 1e93, revision a1) for hardware decoding
qt debug: Logical video size: 1280x720
main debug: resized to 1280x720
main debug: VoutDisplayEvent 'resize' 1280x720
main debug: Received first picture
main debug: Buffering 1%
main debug: Buffering 2%
main debug: Buffering 3%
main debug: auto hiding mouse cursor
main debug: Buffering 4%
main debug: Buffering 5%
main debug: Buffering 6%
main debug: Buffering 7%
main debug: Buffering 8%
main debug: Buffering 9%
main debug: Buffering 10%
main debug: auto hiding mouse cursor
main debug: Buffering 11%
rtp warning: 1 packet(s) lost
rtp warning: 1 packet(s) lost
rtp warning: 1 packet(s) lost
ts warning: discontinuity received 0x3 instead of 0xd (pid=256)
ts warning: discontinuity received 0x5 instead of 0xf (pid=256)
ts warning: discontinuity received 0x1 instead of 0xb (pid=256)
main debug: Buffering 12%
main debug: Buffering 13%
main debug: Buffering 14%
main debug: Buffering 15%
main debug: Buffering 16%
main debug: Buffering 17%
main debug: Buffering 18%
main debug: auto hiding mouse cursor
main debug: Buffering 19%
main debug: Buffering 20%



-
FFprobe doesn't the work in node child_proces
17 mai 2023, par Viktor KushnirHow to invoke the following command in a node.js :


ffprobe -v quiet -of json -show_entries format a.aif



I try to do :


const ffprobe = child_process.spawn("ffprobe", [
 '-v', 
 'quiet', 
 '-of', 
 'json', 
 '-show_entries', 
 'format',
 filePath,
 ]);



But it doesn't work. Tried other variants, but it doesn't work either. I need to get the metadata of the audio file in my application node, how do I do this with ffmpeg ?


Only this work :


const ffprobe = child_process.spawn("ffprobe", [
 filePath,
 ]);



But I want to remove the data I don't need.


-
lavf/movenc : allow writing avc3 sample entry type
15 novembre 2017, par John Stebbins