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  • time stamping using ffmpeg for recording the live stream

    6 septembre 2012, par user1650873

    I have a live video coming from multicast address 239.xxx.xxx.xxx port 5006 with 15 frames/s, i want to capture this video and time stamp current date and time, and save it in MPEG4(h.264) format using ffmpeg. since i am new to ffmpeg please help me in this matter.

  • why is streaming to an flv server with ffmpeg only showing black/blank video for clients ?

    6 septembre 2012, par rogerdpack

    When I stream to an flv server, like flash media server, using ffmpeg, like

     ffmpeg -i input -vcodec libx264 rtmp://hostname/streamname

    it turns out black. Why is that?

  • Getting FFProbe Information With Python

    5 septembre 2012, par Robin Hood

    I've been attempting to figure this out for forever now (I'm new to programming) and I can't figure it out.

    I'm attempting to build a script that will test the file, and give me output from which I can get information like "Audio Format" that I can then put into the filename. However, I can't even get the script to return any file info. I've hit a wall at inserting an input file...

    So at this point I just need help getting it to spit out info based on the argvs I've thrown in. Hopefully I'll be able to figure out how to parse the audio info from that.

    My attempt that seems to be close:

    #!/usr/bin/python
import os, sys, subprocess, shlex, re
from subprocess import call
def probe_file(filename):
    p = subprocess.Popen(['/opt/local/bin/ffprobe', '-show_format', '-pretty', '-loglevel quiet', -i filename], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
    print filename
    print p.communicate()
[probe_file (f) for f in os.listdir('.') if not f.startswith('.')]

  • Burn subtitles Ffmpeg Segmantation Fault error

    5 septembre 2012, par Batuhan Topbaş

    I have vps and ffmpeg latest version. I wanna burn subtitles on videos then i use this input 

    ffmpeg -i ohd.avi -report -acodec copy -strict -2 -vcodec libx264 -acodec aac -sameq -vf ass=ohd.ass outputass.mp4

    But this is give me error. Segmantation Fault. See in output.. 

        ffmpeg started on 2012-09-05 at 10:30:37
Report written to "ffmpeg-20120905-103037.log"
ffmpeg version N-44073-g54ca7e3 Copyright (c) 2000-2012 the FFmpeg developers
  built on Aug 31 2012 16:15:40 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-52)
  configuration: --enable-libfreetype --enable-libx264 --enable-gpl --enable-libfaac --enable-libass --enable-nonfree
  libavutil      51. 70.100 / 51. 70.100
  libavcodec     54. 55.100 / 54. 55.100
  libavformat    54. 25.104 / 54. 25.104
  libavdevice    54.  2.100 / 54.  2.100
  libavfilter     3. 15.101 /  3. 15.101
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, avi, from 'ohd.avi':
  Metadata:
    encoder         : Lavf54.25.104
  Duration: 00:01:00.22, start: 0.000000, bitrate: 4538 kb/s
    Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 23.98 tbn, 47.95 tbc
    Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 44100 Hz, stereo, s16, 192 kb/s
File 'outputass.mp4' already exists. Overwrite ? [y/N] y
FreeType library version: 2.2.1
[Parsed_ass_0 @ 0xa6b4b00] FreeType headers version: 2.2.1
[Parsed_ass_0 @ 0xa6b4b00] Init
[Parsed_ass_0 @ 0xa6b4b00] File size: 622
[Parsed_ass_0 @ 0xa6b4b00] [0xa6b7420] Style: Default,FreeSerif,24,&H00FFFFFF,&H00FFFFFF,&H00FFFFFF,&H00C0C0C0,-1,0,0,0,100,100,0,0.00,1,2,3,2,20,20,20,1
[Parsed_ass_0 @ 0xa6b4b00] Added subtitle file: 'ohd.ass' (1 styles, 1 events)
[Parsed_ass_0 @ 0xa6b4b00] Fontconfig disabled, only default font will be used.
[graph 0 input from stream 0:0 @ 0xa6cd900] w:1280 h:720 pixfmt:yuv420p tb:1001/24000 fr:24000/1001 sar:1/1 sws_param:flags=2
[graph 1 input from stream 0:1 @ 0xa6b0ae0] tb:1/44100 samplefmt:s16 samplerate:44100 chlayout:0x3
[audio format for output stream 0:1 @ 0xa6b0c60] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the filter 'audio format for output stream 0:1'
[auto-inserted resampler 0 @ 0xa6b17c0] chl:stereo fmt:s16 r:44100Hz -> chl:stereo fmt:flt r:44100Hz
[libx264 @ 0xa6bfa20] using SAR=1/1
[libx264 @ 0xa6bfa20] using cpu capabilities: MMX2 SSE2Fast FastShuffle SSEMisalign LZCNT
[libx264 @ 0xa6bfa20] profile High, level 3.1
[libx264 @ 0xa6bfa20] 264 - core 125 r2208 d9d2288 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'outputass.mp4':
  Metadata:
    encoder         : Lavf54.25.104
    Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 24k tbn, 23.98 tbc
    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, flt, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (ac3 -> aac)
Press [q] to stop, [?] for help
Segmentation fault

    What is wrong my input code ? i can't find because i am amateur.

  • FFmpeg lagging issue in android

    5 septembre 2012, par Balwant Kumar Singh

    I'm using FFmpeg using dolphin player. I'm getting video lagging issue and also Audio/Video synch issue for big files.

    Is there any solution to get rid of it? I'm pretty new in this and don't have the knowledge FFmpeg code.

    I've gone through this FFmpeg tutorial site, http://dranger.com/ffmpeg/ffmpeg.html.

    With this I can understand about a little about implementing internal audio/video clock. I'm not able to understand, in which part of FFmpeg I should do alteration for solving this problem.

    Kindly reply with a solution...

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