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• VLC huge buffering times over rtp for local H264 stream

  15 mars 2022, par mike

  I'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 format rtp_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";&#xA;codec = avcodec_find_encoder_by_name(codec_name.c_str());&#xA;context = avcodec_alloc_context3(codec);&#xA;pkt = av_packet_alloc();&#xA;context->bit_rate = 5 * Mega;&#xA;context->width = info.DisplayWidth;&#xA;context->height = info.DisplayHeight;&#xA;context->time_base = { 1, FPS };&#xA;context->framerate = { FPS, 1 };&#xA;context->gop_size = 100;&#xA;context->max_b_frames = 1;            &#xA;context->pix_fmt = AV_PIX_FMT_YUV420P;&#xA;if (codec->id == AV_CODEC_ID_H264)&#xA;            {&#xA;                check_ret("set option: preset", av_opt_set(context->priv_data, "preset", "fast", 0));&#xA;                check_ret("set option: tune", av_opt_set(context->priv_data, "tune", "zerolatency", 0));&#xA;                check_ret("set option: profile", av_opt_set(context->priv_data, "profile", "baseline", 0));                &#xA;            }&#xA;check_ret("open codec", avcodec_open2(context, codec, NULL));&#xA;&#xA;// setup the stream &#xA;fmt = (AVOutputFormat*)av_guess_format("rtp_mpegts", NULL, NULL);&#xA;&#xA;avformat_alloc_output_context2(&amp;avfctx, fmt, fmt->name,&#xA;            "rtp://127.0.0.1:6666?pkt_size=1316"); &#xA;        &#xA;avio_open(&amp;avfctx->pb, avfctx->url, AVIO_FLAG_WRITE);&#xA;AVStream* stream = avformat_new_stream(avfctx, codec);&#xA;avcodec_parameters_from_context(stream->codecpar, context);&#xA;stream->time_base.num = 1;&#xA;stream->time_base.den = FPS;&#xA;avformat_write_header(avfctx, NULL);&#xA;&#xA;// then the encoding (in an output loop)&#xA;<not get="get" frame="frame" from="from" rgba="rgba" to="to" yuv="yuv">&#xA;yuvFrame->pts = i&#x2B;&#x2B;; // i is incremented every frame&#xA;avcodec_send_frame(enc_ctx, yuvFrame);&#xA; while (ret >= 0) {&#xA;  ret = avcodec_receive_packet(enc_ctx, pkt);          &#xA;  //ret = av_interleaved_write_frame(avfctx, pkt); was using this, don&#x27;t seem to need it&#xA;  ret = av_write_frame(avfctx, pkt);&#xA;  av_packet_unref(pkt);&#xA;}&#xA;</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%


  


• Screencasting with hardware-accelerated gnome-3 [closed]

  30 octobre 2012, par Jeroen

  I am running Ubuntu 12.04 with gnome 3 shell, and I would like to create a screencast. I have tried using recordMyDesktop, Kazam Screencaster, and ffmpeg but all suffer from the same problem, which I think has to do with hardware acceleration in Gnome 3. The recorded videos all get very glitchy with blue space for all operations that use some sort of effect. Here is an example recording : http://www.stat.ucla.edu/ jeroen/files/screencast.mkv.

  The only method that does not seem to suffer from this, is the (largely undocumented) CTRL+SHIFT+R shortcut in gnome 3 that will start a recording. However, this feature is very buggy otherwise and often crashes when I enable audio input.

  My machine has a GeForce GT 120 with Apple LED Cinema monitor. I am using the proprietary nvidia drivers that ship with Ubuntu 12.04. Is there any way I can record the video as it appears on my screen ? I know I can avoid the problem by switching to gnome2 or unity 2d or anything that does not use effects, but I would prefer to make the recordings in my regular gnome 3 environment.

• ffmpeg with cuda and concat videos [closed]

  15 septembre 2024, par Petr Šimůnek

  I have a ffmpeg command with nvidia hw support that I want to join two videos :

  


  /home/videotest/ffmpeg-dev/ffmpeg -benchmark -hide_banner -loglevel warning -y -hwaccel_device 0 -hwaccel cuda -hwaccel_output_format cuda -i /mnt/video-storage/test/cuda/surfing/intermediate1.mp4 -i /mnt/video-storage/test/cuda/surfing/intermediate2. mp4 -filter_complex 'hwupload_cuda,[0:v:0][0:a:0][1:v:0][1:a:0]concat=n=2:v=1:a=1 [outv] [outa]' -map [outv] -map [outa] -pix_fmt yuv420p -c:v h264_nvenc -preset p6 -profile: v high -force_key_frames 'expr:gte(t,n_forced*5)' -bf 0 -movflags +faststart -b:v 3000k -maxrate 4000k /mnt/video-storage/test/cuda/surfing/game.mp4

  


  I get an error message after starting :

  


  Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scale_0' [fc#0 @ 0x61ae2b37a1c0] Error reinitializing filters!

  


  I can't figure out how to remove it. Can you help me ? Thank you.

  


  If I use nvdec/nvenc instead of cuda, this error does not appear and the video is created fine.