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  • GStreamer with MPEG-TS Video4Linux ATSC/DVB Recording

    21 juin 2013, par Dustin Oprea

    I'm having an impossible time setting up a filtergraph to read from a recording that I made from my DVB video4linux device. Any help would be vastly appreciated.

    How I made the recording :

    To tune the channel :

    azap -c ~/channels.conf "Florida"

    To record the channel :

    cat /dev/dvb/adapter0/dvr0 > /tmp/test

    This is the way that recordings must be made (I can not use any GST DVB plugins to do this for me).

    I used tstools to identify that the recording is a TS stream :

    tstools/bin$ ./stream_type ~/recordings/20130129-202049
    
Reading from /home/dustin/recordings/20130129-202049
    
It appears to be Transport Stream

    ...but that there are no PAT/PMT frames :

    tstools/bin$ ./tsinfo ~/recordings/20130129-202049
    
Reading from /home/dustin/recordings/20130129-202049
    
Scanning 10000 TS packets
    

    
Found 0 PAT packets and 0 PMT packets in 10000 TS packets

    I was able to produce a single ES (elementary stream) stream, by running ts2es :

    tstools/bin$ ./ts2es -pid 97 ~/recordings/20130129-202049 ~/recordings/20130129-202049.es
    
Reading from /home/dustin/recordings/20130129-202049
    
Writing to   /home/dustin/recordings/20130129-202049.es
    
Extracting packets for PID 0061 (97)
    
!!! 4 bytes ignored at end of file - not enough to make a TS packet
    
Extracted 219258 of 248113 TS packets

    I am able to play the ES stream (even though the video is frozen on the first frame) :

    gst-launch-0.10 filesrc location=~/recordings/20130129-202049.es ! decodebin2 ! autovideosink
    
gst-launch-0.10 filesrc location=~/recordings/20130129-202049.es ! decodebin2 ! xvimagesink
    
gst-launch-0.10 playbin2 uri=file:///home/dustin/recordings/20130129-202049.es

    No matter what I do, though, I can't get the original TS file to open. However, it opens in Mplayer/FFMPEG, perfectly (but not VLC). This is the output of FFMPEG :

    ffmpeg -i 20130129-202049
    

    
ffmpeg version 0.8.5-4:0.8.5-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
    
  built on Jan 24 2013 18:03:14 with gcc 4.6.3
    
*** THIS PROGRAM IS DEPRECATED ***
    
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
    
[mpeg2video @ 0x9be7be0] mpeg_decode_postinit() failure
    
    Last message repeated 4 times
    
[mpegts @ 0x9be3aa0] max_analyze_duration reached
    
[mpegts @ 0x9be3aa0] PES packet size mismatch
    
Input #0, mpegts, from '20130129-202049':
    
  Duration: 00:03:39.99, start: 9204.168844, bitrate: 1696 kb/s
    
    Stream #0.0[0x61]: Video: mpeg2video (Main), yuv420p, 528x480 [PAR 40:33 DAR 4:3], 15000 kb/s, 30.57 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    
    Stream #0.1[0x64]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
    
At least one output file must be specified

    This tells us that the video stream has PID 0x61 (97).

    I have been trying for a few days, so the following are only examples of a couple of attempts. I'll provide the playbin2 example first, since I know that thousands of people will respond, insisting that I just use that. It doesn't work.

    gst-launch-0.10 playbin2 uri=file:///home/dustin/recordings/20130129-202049
    

    
Setting pipeline to PAUSED ...
    
Pipeline is PREROLLING ...
    
ERROR: from element /GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstDecodeBin2:decodebin20/GstMpegTSDemux:mpegtsdemux0: Could not determine type of stream.
    
Additional debug info:
    
gstmpegtsdemux.c(2931): gst_mpegts_demux_sink_event (): /GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstDecodeBin2:decodebin20/GstMpegTSDemux:mpegtsdemux0:
    
No valid streams found at EOS
    
ERROR: pipeline doesn't want to preroll.
    
Setting pipeline to NULL ...
    
Freeing pipeline ...

    It fails [probably] because no PID has been specified with which to find the video (the "EOS" error, I think).

    Naturally, I tried the following to start by demuxing the TS format. I believe it's the "es-pids" property that receives the PID in the absence of PMT information (which tstools said there weren't any, above), but I tried "program-number", too, just in case. gst-inspect indicates that one is hex and the other is decimal :

    gst-launch-0.10 -v filesrc location=20130129-202049 ! mpegtsdemux es-pids=0x61 ! fakesink
    
gst-launch-0.10 -v filesrc location=20130129-202049 ! mpegtsdemux program-number=97 ! fakesink

    Output :

    gst-launch-0.10 filesrc location=20130129-202049 ! mpegtsdemux es-pids=0x61 ! fakesink
    
Setting pipeline to PAUSED ...
    
Pipeline is PREROLLING ...
    
ERROR: from element /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0: Could not determine type of stream.
    
Additional debug info:
    
gstmpegtsdemux.c(2931): gst_mpegts_demux_sink_event (): /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0:
    
No valid streams found at EOS
    
ERROR: pipeline doesn't want to preroll.
    
Setting pipeline to NULL ...
    
Freeing pipeline ...
    
dustin@dustinmicro:~/recordings$ gst-launch-0.10 -v filesrc location=20130129-202049 ! mpegtsdemux es-pids=0x61 ! fakesink
    
Setting pipeline to PAUSED ...
    
Pipeline is PREROLLING ...
    
ERROR: from element /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0: Could not determine type of stream.
    
Additional debug info:
    
gstmpegtsdemux.c(2931): gst_mpegts_demux_sink_event (): /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0:
    
No valid streams found at EOS
    
ERROR: pipeline doesn't want to preroll.
    
Setting pipeline to NULL ...
    
Freeing pipeline ...
    
dustin@dustinmicro:~/recordings$ gst-launch-0.10 -v filesrc location=20130129-202049 ! mpegtsdemux es-pids=0x61 ! fakesink
    
Setting pipeline to PAUSED ...
    
Pipeline is PREROLLING ...
    
ERROR: from element /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0: Could not determine type of stream.
    
Additional debug info:
    
gstmpegtsdemux.c(2931): gst_mpegts_demux_sink_event (): /GstPipeline:pipeline0/GstMpegTSDemux:mpegtsdemux0:
    
No valid streams found at EOS
    
ERROR: pipeline doesn't want to preroll.
    
Setting pipeline to NULL ...
    
Freeing pipeline ...

    However, when I try mpegpsdemux (for program streams (PS), as opposed to transport streams (TS)), I get further :

    gst-launch-0.10 filesrc location=20130129-202049 ! mpegpsdemux ! fakesink
    

    
Setting pipeline to PAUSED ...
    
Pipeline is PREROLLING ...
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion `position != -1' failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_mini_object_ref: assertion `mini_object != NULL' failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_pad_push_event: assertion `event != NULL' failed
    
Pipeline is PREROLLED ...
    
Setting pipeline to PLAYING ...
    
New clock: GstSystemClock
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion `position != -1' failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_mini_object_ref: assertion `mini_object != NULL' failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_pad_push_event: assertion `event != NULL' failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion `position != -1' failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_mini_object_ref: assertion `mini_object != NULL' failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_pad_push_event: assertion `event != NULL' failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion `position != -1' failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_mini_object_ref: assertion `mini_object != NULL' failed
    

    
(gst-launch-0.10:14805): GStreamer-CRITICAL **: gst_pad_push_event: assertion `event != NULL' failed
    

    

    
...
    

    

    
Got EOS from element "pipeline0".
    
Execution ended after 1654760008 ns.
    
Setting pipeline to PAUSED ...
    
Setting pipeline to READY ...
    
Setting pipeline to NULL ...
    
Freeing pipeline ...

    I'll still get the same problem whenever I use the mpegtsdemux, even if it follows mpegpsdemux, above.

    I don't understand this, since I haven't even picked a PID yet.

    What am I doing wrong ?

    Dustin

  • 'avcodec_decode_video' of ffmpeg doesn't work

    1er février 2012, par sirupa

    i use vc++ express, and am going to get with ffmpeg..

    but with the 1st program i met a trouble.

    vc++ says 'identifier 'avcodec_decode_video' : identifier not found' on commpile process.

    i don't know why....

    next is waht i coded...
    .

    include "avcodec.h"
    

    
include "avformat.h"
    

    
include "swscale.h"
    

    
int main(int argc, char *argv[])
    

    
{
    
av_register_all();
    

    
AVFormatContext *pFormatCtx;
    

    
// Open video file
    

    
if(av_open_input_file(&pFormatCtx, argv[1], NULL, 0, NULL)!=0)
    

    
  return -1; // Couldn't open file
    

    
// Retrieve stream information
    

    
if(av_find_stream_info(pFormatCtx)<0)
    

    
    return -1; // Couldn't find stream information
    

    
// Dump information about file onto standard error
    

    
dump_format(pFormatCtx, 0, argv[1], 0);
    

    

    
int i;
    

    
AVCodecContext *pCodecCtx;
    

    
// Find the first video stream
    

    
int videoStream=-1;
    

    
for(i=0; inb_streams; i++)
    

    
    if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
    

    
    videoStream=i;
    

    
    break;
    

    
}
    

    
if(videoStream==-1)
    

    
    return -1; // Didn't find a video stream
    

    
// Get a pointer to the codec context for the video stream
    

    
pCodecCtx=pFormatCtx->streams[videoStream]->codec;
    

    
AVCodec *pCodec;
    

    

    
// Find the decoder for the video stream
    

    
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
    

    
if(pCodec==NULL) {
    

    
    fprintf(stderr, "Unsupported codec!\n");
    

    
    return -1; // Codec not found
    

    
}
    

    
// Open codec
    

    
if(avcodec_open(pCodecCtx, pCodec)<0)
    

    
    return -1; // Could not open codec
    

    
AVFrame *pFrame;
    

    
// Allocate video frame
    

    
pFrame=avcodec_alloc_frame();
    

    
    // Allocate an AVFrame structure
    

    
AVFrame* pFrameRGB=avcodec_alloc_frame();
    

    
if(pFrameRGB==NULL)
    

    
  return -1;
    

    
uint8_t *buffer;
    

    
int numBytes;
    

    
// Determine required buffer size and allocate buffer
    

    
numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,pCodecCtx->height);
    

    
buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
    

    
// Assign appropriate parts of buffer to image planes in pFrameRGB
    

    
// Note that pFrameRGB is an AVFrame, but AVFrame is a superset
    

    
// of AVPicture
    

    
avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,pCodecCtx->width, pCodecCtx->height);
    

    
int frameFinished;
    

    
AVPacket packet;
    

    
i=0;
    

    
while(av_read_frame(pFormatCtx, &packet)>=0) {
    

    
    if(packet.stream_index==videoStream) {
    

    
**// here makes compile error**
    

    
    avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,packet.data, packet.size);
    

    
    if(frameFinished) {
    

    
    img_convert((AVPicture *)pFram eRGB, PIX_FMT_RGB24, (AVPicture*)pFrame, pCodecCtx->pix_fmt,pCodecCtx->width, pCodecCtx->height);
    

    
     }
    
av_free_packet(&packet);
    
}
    
av_free(buffer);
    

    
av_free(pFrameRGB);
    

    
av_free(pFrame);
    

    
avcodec_close(pCodecCtx);
    

    
av_close_input_file(pFormatCtx);
    

    

    
  return 0;

    }

  • flv reencode to mp4 for iphone/ipod via ffmpeg and x264 (quality issue)

    3 octobre 2011, par zeroasterisk

    There are a lot of questions on this topic, and I've read most of them and most of the google search results I could come up with.

    When I use FFMPEG to convert a FLV to a iphone3 compatble MP4 file, it just doesn't preserver enough of the quality. Yes, I've worked the hell out of -sameq and -b and -bt settings, text just isn't readable.

    Next I tried to split the video out and process it directly, using these instructions :
    https://sites.google.com/site/linuxencoding/x264-encoding-guide

    The problem is myplayer (via ffmpeg) was not able to determine the duration of the FLV (even though the metadata was set).

    (I assume) Because of that unknown duration, when I create the MP4 file, the resulting x264 file plays through super-fast while the audio plays at the normal rate.

    user@server:/tmp# mplayer -nosound -benchmark -sws 9 -vf dsize=640:480:0,scale=0:0,expand=640:480 -vo yuv4mpeg:file=>(x264 --demuxer y4m --crf 0 --preset slow --threads auto --output output.264 - 2>x264.log) 'input.flv'
    
MPlayer 1.0rc4-4.4.5 (C) 2000-2010 MPlayer Team
    
mplayer: could not connect to socket
    
mplayer: No such file or directory
    
Failed to open LIRC support. You will not be able to use your remote control.
    

    
Playing input.flv.
    
libavformat file format detected.
    
[flv @ 0x1202460]Estimating duration from bitrate, this may be inaccurate
    
[lavf] stream 0: video (vp6f), -vid 0
    
[lavf] stream 1: audio (nellymoser), -aid 0
    
VIDEO:  [VP6F]  1680x992  0bpp  1000.000 fps   33.4 kbps ( 4.1 kbyte/s)
    
Clip info:
    
 audiocodecid: 6
    
 audiodatarate: 86
    
 audiosamplerate: 44100
    
 audiosamplesize: 16
    
 audiosize: 6097005
    
 canSeekToEnd: true
    
 datasize: 8609138
    
 duration: 567
    
 framerate: 2
    
 hasAudio: true
    
 hasCuePoints: false
    
 hasKeyframes: true
    
 hasMetadata: true
    
 hasVideo: true
    
 height: 992
    
 lasttimestamp: 567
    
 metadatacreator: flvtool++ (Facebook, Motion project, dweatherford)
    
 stereo: false
    
 totalframes: 1043
    
 videocodecid: 4
    
 videodatarate: 33
    
 videosize: 2316256
    
 width: 1680
    
Using (default) progressive frame mode.Opening video filter: [expand w=640 h=480]
    
Expand: 640 x 480, -1 ; -1, osd: 0, aspect: 0.000000, round: 1
    
Opening video filter: [scale w=0 h=0]
    
Opening video filter: [dsize=640:480:0]
    
==========================================================================
    
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
    
Selected video codec: [ffvp6f] vfm: ffmpeg (FFmpeg VP6 Flash)
    
==========================================================================
    
Audio: no sound
    
Starting playback...
    
Movie-Aspect is undefined - no prescaling applied.
    
[swscaler @ 0x7f0c738b9620]Lanczos scaler, from yuv420p to yuv420p using MMX2
    
VO: [yuv4mpeg] 640x480 => 641x480 Planar YV12

    I have also tried specifying FPS, but no change in results

    user@server:/tmp# mplayer -nosound -fps 25-benchmark -sws 9 -vf dsize=640:480:0,scale=0:0,expand=640:480 -vo yuv4mpeg:file=>(x264 --demuxer y4m --fps 25 --crf 0 --preset slow --threads auto --output output.264 - 2>x264.log) 'input.flv'

    Can someone tell me how to either :

    1. fix my split A/V processing/timing/duration issues ?
    2. improve the
      quality of the FFMPEG conversion of FLV to iphone3 compatible
      format ?

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