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• ffmpeg transcoding stop after few seconds

  9 avril 2018, par Salem F

  Hi i’m trying to do this over week now with no success ,
  What’s i’m trying to do is transcoding video from live streaming source and downscale it with FFmpeg , but every time I start transcoding it broadcasting fro 11 Sec and stop . here last command I tried

    ffmpeg  -re  -i 'http://source.com/1034.ts' -preset ultrafast http://localhost:2052/feed1.ffm

  I tried to download the .ts file with IDM and it finish downloading the file on the exact 12 Sec that FFmpeg stop trans coding on it .

  does that means that FFmpeg download that file as one segment and not continued reading the source video As what video players does usually . BTW I tried with source with VLC player and it didn’t stop playing the the same source video .

  Edit :- I decide to pass FFmpeg command via FFserver config file ffserver.conf

  Launch ffmpeg -i 'http://source.com/1.ts' -copyinkf -codec copy   

  The stream works fine for a while but after testing couple sources I notice it’s struggle to trans-coding HD videos .

  I guess the issue with my VPS KVM server being very limited CPU and RAM ( 128MB only ) ! Since I tried using ultrafast preset but din’t solve the issue , another thing , I notice when I enable AVOptionVideo crf setting on ffserver.conf trans-coding runs bit smoothly without frame-rate dropping .
  Las my server uses Xeon L5520 CPU which is outdated CPU specially I gout 1/4 power of V single core (if they count HT it will be 1/8 of the real core ) :(

  Edit 2 :-

  # vlc -I dummy 'https://source.com/1034.ts' --sout '#standard{access=http,mux=flv,dst=localhost:2052}'
  
  VLC media player 2.2.8 Weatherwax (revision 2.2.7-14-g3cc1d8cba9)
  
  [09d3fdf0] pulse audio output error: PulseAudio server connection failure: Connection refused
  
  [09d279c0] core interface error: no suitable interface module
  
  [09c9b8f8] core libvlc error: interface "globalhotkeys,none" initialization failed
  
  [09d279c0] dbus interface error: Failed to connect to the D-Bus session daemon: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
  
  [09d279c0] core interface error: no suitable interface module
  
  [09c9b8f8] core libvlc error: interface "dbus,none" initialization failed
  
  [09d279c0] dummy interface: using the dummy interface module...
  
  [b5e04ae0] access_output_http access out: Consider passing --http-host=IP on the command line instead.
  
  [b5e38ab8] ts demux: MPEG-4 descriptor not found for pid 0x101 type 0xf
  
  [b5e90ae0] packetizer_mpeg4audio decoder: AAC channels: 2 samplerate: 48000
  
  [flv @ 0xb5e33b40] dimensions not set
  
  [b5e06360] avformat mux error: could not write header: Invalid argument
  
  [b5e88ef0] core decoder error: cannot continue streaming due to errors
  
  [b5e90ae0] core decoder error: cannot continue streaming due to errors

  Here output with -loglevel verbose

  :~# ffmpeg -i http://source.com/1.ts -copyinkf -codec copy  -loglevel verbose  http://127.0.0.1:8090/feed1.ffm
  
  ffmpeg version 2.6.9 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.9.2 (Debian 4.9.2-10)
  
    configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector-strong -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/i386-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libpulse --disable-mips32r2 --disable-mipsdspr1 --disable-mipsdspr2 --enable-libvidstab --enable-libzvbi --enable-avresample --disable-htmlpages --disable-podpages --enable-libutvideo --enable-libfdk-aac --enable-libx265 --enable-libiec61883 --enable-vaapi --enable-libdc1394 --disable-altivec --shlibdir=/usr/lib/i386-linux-gnu
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Invalid UE golomb code
  
      Last message repeated 2 times
  
  Input #0, mpegts, from 'http://source.com/1.ts':
  
    Duration: N/A, start: 30472.768167, bitrate: N/A
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 960x540 (960x544) [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 100 tbc
  
      Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 105 kb/s
  
  [graph 0 input from stream 0:1 @ 0x971f2c0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x3
  
  [audio format for output stream 0:0 @ 0x9844de0] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the filter 'audio format for output stream 0:0'
  
  [auto-inserted resampler 0 @ 0x97115e0] ch:2 chl:stereo fmt:fltp r:48000Hz -> ch:1 chl:mono fmt:fltp r:22050Hz
  
  [graph 1 input from stream 0:0 @ 0x96f5d00] w:960 h:540 pixfmt:yuv420p tb:1/90000 fr:50/1 sar:1/1 sws_param:flags=2
  
  [scaler for output stream 0:1 @ 0x96f5e80] w:352 h:240 flags:'0x4' interl:0
  
  [scaler for output stream 0:1 @ 0x96f5e80] w:960 h:540 fmt:yuv420p sar:1/1 -> w:352 h:240 fmt:yuv420p sar:40/33 flags:0x4
  
  Output #0, ffm, to 'http://127.0.0.1:8090/feed1.ffm':
  
    Metadata:
  
      creation_time   : now
  
      encoder         : Lavf56.25.101
  
      Stream #0:0: Audio: wmav2, 22050 Hz, mono, fltp, 64 kb/s
  
      Metadata:
  
        encoder         : Lavc56.26.100 wmav2
  
      Stream #0:1: Video: msmpeg4v3 (msmpeg4), yuv420p, 352x240 [SAR 40:33 DAR 16:9], q=2-31, 256 kb/s, 50 fps, 1000k tbn, 15 tbc
  
      Metadata:
  
        encoder         : Lavc56.26.100 msmpeg4
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (aac (native) -> wmav2 (native))
  
    Stream #0:0 -> #0:1 (h264 (native) -> msmpeg4v3 (msmpeg4))
  
  Press [q] to stop, [?] for help
  
  Invalid UE golomb code
  
  *** dropping frame 3 from stream 1 at ts 1
  
      Last message repeated 1 times
  
  [msmpeg4 @ 0x970f060] warning, clipping 1 dct coefficients to -127..127
  
  *** dropping frame 4 from stream 1 at ts 2
  
      Last message repeated 1 times
  
  *** dropping frame 5 from stream 1 at ts 3
  
      Last message repeated 1 times
  
  *** dropping frame 5 from stream 1 at ts 4
  
  *** dropping frame 6 from stream 1 at ts 4
  
      Last message repeated 1 times
  
  *** dropping frame 7 from stream 1 at ts 5
  
      Last message repeated 1 times
  
  [msmpeg4 @ 0x970f060] warning, clipping 1 dct coefficients to -127..127
  
  *** dropping frame 8 from stream 1 at ts 6
  
      Last message repeated 1 times
  
  *** dropping frame 8 from stream 1 at ts 7
  
  *** dropping frame 9 from stream 1 at ts 7
  
      Last message repeated 1 times
  
  *** dropping frame 10 from stream 1 at ts 8
  
      Last message repeated 1 times
  
  *** dropping frame 11 from stream 1 at ts 9
  
      Last message repeated 1 times
  
  *** dropping frame 11 from stream 1 at ts 10
  
  *** dropping frame 12 from stream 1 at ts 10
  
      Last message repeated 1 times
  
  *** dropping frame 13 from stream 1 at ts 11
  
      Last message repeated 1 times
  
  *** dropping frame 14 from stream 1 at ts 12
  
      Last message repeated 1 times
  
  *** dropping frame 14 from stream 1 at ts 13
  
  *** dropping frame 15 from stream 1 at ts 13
  
      Last message repeated 1 times
  
  *** dropping frame 16 from stream 1 at ts 14
  
      Last message repeated 1 times
  
  *** dropping frame 17 from stream 1 at ts 15
  
      Last message repeated 1 times
  
  *** dropping frame 17 from stream 1 at ts 16
  
  *** dropping frame 18 from stream 1 at ts 16
  
      Last message repeated 1 times
  
  *** dropping frame 19 from stream 1 at ts 17
  
      Last message repeated 1 times
  
  *** dropping frame 20 from stream 1 at ts 18me=00:00:01.33 bitrate= 270.3kbits/s dup=0 drop=39
  
      Last message repeated 1 times
  
  *** dropping frame 20 from stream 1 at ts 19
  
  *** dropping frame 21 from stream 1 at ts 19
  
      Last message repeated 1 times
  
  *** dropping frame 22 from stream 1 at ts 20
  
      Last message repeated 1 times
  
  *** dropping frame 23 from stream 1 at ts 21
  
      Last message repeated 1 times
  
  *** dropping frame 23 from stream 1 at ts 22
  
  *** dropping frame 24 from stream 1 at ts 22
  
      Last message repeated 1 times
  
  *** dropping frame 25 from stream 1 at ts 23
  
      Last message repeated 1 times
  
  *** dropping frame 26 from stream 1 at ts 24
  
      Last message repeated 1 times
  
  *** dropping frame 26 from stream 1 at ts 25
  
  *** dropping frame 27 from stream 1 at ts 25
  
      Last message repeated 1 times
  
  *** dropping frame 28 from stream 1 at ts 26
  
      Last message repeated 1 times
  
  *** dropping frame 29 from stream 1 at ts 27
  
      Last message repeated 1 times
  
  *** dropping frame 29 from stream 1 at ts 28
  
  *** dropping frame 30 from stream 1 at ts 28
  
      Last message repeated 1 times
  
  *** dropping frame 31 from stream 1 at ts 29
  
      Last message repeated 1 times
  
  *** dropping frame 32 from stream 1 at ts 30
  
      Last message repeated 1 times
  
  *** dropping frame 32 from stream 1 at ts 31
  
  *** dropping frame 33 from stream 1 at ts 31
  
      Last message repeated 1 times
  
  *** dropping frame 34 from stream 1 at ts 32
  
      Last message repeated 1 times
  
  *** dropping frame 34 from stream 1 at ts 33
  
  *** dropping frame 35 from stream 1 at ts 33
  
  *** dropping frame 35 from stream 1 at ts 34
  
  *** dropping frame 36 from stream 1 at ts 34
  
      Last message repeated 1 times
  
  *** dropping frame 37 from stream 1 at ts 35
  
      Last message repeated 1 times
  
  Invalid UE golomb code
  
  *** dropping frame 38 from stream 1 at ts 36
  
      Last message repeated 1 times
  
  *** dropping frame 38 from stream 1 at ts 37
  
  *** dropping frame 39 from stream 1 at ts 37
  
      Last message repeated 1 times
  
  *** dropping frame 40 from stream 1 at ts 38
  
      Last message repeated 1 times
  
  *** dropping frame 41 from stream 1 at ts 39me=00:00:02.73 bitrate= 311.7kbits/s dup=0 drop=88
  
      Last message repeated 1 times
  
  *** dropping frame 41 from stream 1 at ts 40
  
  *** dropping frame 42 from stream 1 at ts 40
  
      Last message repeated 1 times
  
  *** dropping frame 43 from stream 1 at ts 41
  
      Last message repeated 1 times
  
  *** dropping frame 44 from stream 1 at ts 42
  
      Last message repeated 1 times
  
  *** dropping frame 44 from stream 1 at ts 43
  
  *** dropping frame 45 from stream 1 at ts 43
  
      Last message repeated 1 times
  
  *** dropping frame 46 from stream 1 at ts 44
  
      Last message repeated 1 times
  
  *** dropping frame 47 from stream 1 at ts 45
  
      Last message repeated 1 times
  
  *** dropping frame 47 from stream 1 at ts 46
  
  *** dropping frame 48 from stream 1 at ts 46
  
      Last message repeated 1 times
  
  *** dropping frame 49 from stream 1 at ts 47
  
      Last message repeated 1 times
  
  *** dropping frame 50 from stream 1 at ts 48
  
      Last message repeated 1 times
  
  *** dropping frame 50 from stream 1 at ts 49
  
  *** dropping frame 51 from stream 1 at ts 49
  
      Last message repeated 1 times
  
  *** dropping frame 52 from stream 1 at ts 50
  
      Last message repeated 1 times
  
  *** dropping frame 53 from stream 1 at ts 51
  
      Last message repeated 1 times
  
  [h264 @ 0x9844a00] error while decoding MB 58 12, bytestream -5
  
  [h264 @ 0x9844a00] concealing 1311 DC, 1311 AC, 1311 MV errors in B frame
  
  *** dropping frame 53 from stream 1 at ts 52
  
  No more output streams to write to, finishing.
  
  frame=   55 fps= 42 q=4.3 Lsize=     152kB time=00:00:03.66 bitrate= 339.6kbits/s dup=0 drop=119
  
  video:116kB audio:26kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 6.760316%
  
  Input file #0 (http://source.com/1.ts):
  
    Input stream #0:0 (video): 174 packets read (220322 bytes); 174 frames decoded;
  
    Input stream #0:1 (audio): 156 packets read (36657 bytes); 156 frames decoded (159744 samples);
  
    Total: 330 packets (256979 bytes) demuxed
  
  Output file #0 (http://127.0.0.1:8090/feed1.ffm):
  
    Output stream #0:0 (audio): 72 frames encoded (73383 samples); 72 packets muxed (26712 bytes);
  
    Output stream #0:1 (video): 55 frames encoded; 55 packets muxed (119080 bytes);
  
    Total: 127 packets (145792 bytes) muxed

  Here input url file info After i download it to my PC with IDM

  General
  
  ID                             : 1 (0x1)
  
  Complete name                  : D:\1.ts
  
  Format                         : MPEG-TS
  
  File size                      : 256 KiB
  
  Duration                       : 2 s 520 ms
  
  Overall bit rate mode          : Variable
  
  Overall bit rate               : 788 kb/s
  
  
  
  Video
  
  ID                             : 256 (0x100)
  
  Menu ID                        : 1 (0x1)
  
  Format                         : AVC
  
  Format/Info                    : Advanced Video Codec
  
  Format profile                 : High@L3.1
  
  Format settings, CABAC         : Yes
  
  Format settings, RefFrames     : 2 frames
  
  Codec ID                       : 27
  
  Duration                       : 2 s 680 ms
  
  Width                          : 960 pixels
  
  Height                         : 540 pixels
  
  Display aspect ratio           : 16:9
  
  Frame rate                     : 50.000 FPS
  
  Color space                    : YUV
  
  Chroma subsampling             : 4:2:0
  
  Bit depth                      : 8 bits
  
  Scan type                      : Progressive
  
  
  
  Audio
  
  ID                             : 257 (0x101)
  
  Menu ID                        : 1 (0x1)
  
  Format                         : AAC
  
  Format/Info                    : Advanced Audio Codec
  
  Format version                 : Version 4
  
  Format profile                 : LC
  
  Muxing mode                    : ADTS
  
  Codec ID                       : 15
  
  Duration                       : 2 s 69 ms
  
  Bit rate mode                  : Variable
  
  Channel(s)                     : 2 channels
  
  Channel positions              : Front: L R
  
  Sampling rate                  : 48.0 kHz
  
  Frame rate                     : 46.875 FPS (1024 SPF)
  
  Compression mode               : Lossy
  
  Delay relative to video        : -12 ms
  
  
  
  Menu
  
  ID                             : 4096 (0x1000)
  
  Menu ID                        : 1 (0x1)
  
  Duration                       : 2 s 520 ms
  
  List                           : 256 (0x100) (AVC) / 257 (0x101) (AAC)
  
  Service name                   : Service01
  
  Service provider               : FFmpeg
  
  Service type                   : digital television

• Dreamcast Serial Extractor

  31 décembre 2017, par Multimedia Mike — Sega Dreamcast

  It has not been a very productive year for blogging. But I started the year by describing an unfinished project that I developed for the Sega Dreamcast, so I may as well end the year the same way. The previous project was a media player. That initiative actually met with some amount of success and could have developed into something interesting if I had kept at it.

  By contrast, this post describes an effort that was ultimately a fool’s errand that I spent way too much time trying to make work.

  Problem Statement
  In my neverending quest to analyze the structure of video games while also hoarding a massive collection of them (though I’m proud to report that I did play at least a few of them this past year), I wanted to be able to extract the data from my many Dreamcast titles, both games and demo discs. I had a tool called the DC Coder’s Cable, a serial cable that enables communication between a Dreamcast and a PC. With the right software, you could dump an entire Dreamcast GD-ROM, which contained a gigabyte worth of sectors.

  Problem : The dumping software (named ‘dreamrip’ and written by noted game hacker BERO) operated in a very basic mode, methodically dumping sector after sector and sending it down the serial cable. This meant that it took about 28 hours to extract all the data on a single disc by running at the maximum speed of 115,200 bits/second, or about 11 kilobytes/second. I wanted to create a faster method.

  The Pitch
  I formed a mental model of dreamrip’s operation that looked like this :

  
  
  

  As an improvement, I envisioned this beautiful architecture :
  

  
  
  

  Architectural Assumptions
  My proposed architecture was predicated on the assumption that the disc reading and serial output functions were both I/O-bound operations and that the CPU would be idle much of the time. My big idea was to use that presumably idle CPU time to compress the sectors before sending them over the wire. As long as the CPU can compress the data faster than 11 kbytes/sec, it should be a win. In order to achieve this, I broke the main program into 3 threads :

  1. The first thread reads the sectors ; more specifically, it asks the drive firmware to please read the sectors and make the data available in system RAM
  2. The second thread waits for sector data to appear in memory and then compresses it
  3. The third thread takes the compressed data when it is ready and shuffles it out through the serial cable

  Simple and elegant, right ?

  For data track compression, I wanted to start with zlib in order to prove the architecture, but then also try bzip2 or lzma. As long as they could compress data faster than the serial port could write it, then it should be a win. For audio track compression, I wanted to use the Flake FLAC encoder. According to my notes, I did get both bzip2 compression and the Flake compressor working on the Dreamcast. I recall choosing Flake over the official FLAC encoder because it was much simpler and had fewer dependencies, always an important consideration for platforms such as this.

  Problems
  I worked for quite awhile on this project. I have a lot of notes recorded but a lot of the problems I had remain a bit vague in my memory. However, there was one problem I discovered that eventually sunk the entire initiative :

  The serial output operation is CPU-bound.

  My initial mental model was that the a buffer could be “handed off” to the serial subsystem and the CPU could go back to doing other work. Nope. Turns out that the CPU was participating at every step of the serial transfer.

  Further, I eventually dug into the serial driver code and learned that there was already some compression taking place via the miniLZO library.

  Lessons Learned

  • Recognize the assumptions that you’re making up front at the start of the project.
  • Prototype in order to ensure plausibility
  • Profile to make sure you’re optimizing the right thing (this is something I have learned again and again).

  Another interesting tidbit from my notes : it doesn’t matter how many sectors you read at a time, the overall speed is roughly the same. I endeavored to read 1000 2048-byte data sectors, 1 or 10 or 100 at a time, or all 1000 at once. My results :

  • 1 : 19442 ms
  • 10 : 19207 ms
  • 100 : 19194 ms
  • 1000 : 19320 ms

  No difference. That surprised me.

  Side Benefits
  At one point, I needed to understand how BERO’s dreamrip software was operating. I knew I used to have the source code but I could no longer find it. Instead, I decided to try to reverse engineer what I needed from the SH-4 binary image that I had. It wasn’t an ELF image ; rather, it was a raw binary meant to be loaded at a particular memory location which makes it extra challenging for ‘objdump’. This led to me asking my most viewed and upvoted question on Stack Overflow : “Disassembling A Flat Binary File Using objdump”. The next day, it also led me to post one of my most upvoted answers when I found the solution elsewhere.

  Strangely, I have since tried out the command line shown in my answer and have been unable to make it work. But people keep upvoting both the question and the answer.

  Eventually this all became moot when I discovered a misplaced copy of the source code on one of my computers.

  I strongly recall binging through the Alias TV show while I was slogging away on this project, so I guess that’s a positive association since I got so many fun screenshots out of it.

  The Final Resolution
  Strangely, I was still determined to make this project work even though the Dreamcast SD adapter arrived for me about halfway through the effort. Part of this was just stubbornness, but part of it was my assumptions about serial port speeds, in particular, my assumption that there was a certain speed-of-light type of limitation on serial port speeds so that the SD adapter, operating over the DC’s serial port, would not be appreciably faster than the serial cable.

  This turned out to be very incorrect. In fact, the SD adapter is capable of extracting an entire gigabyte disc image in 35-40 minutes. This is the method I have since been using to extract Dreamcast disc images.

  The post Dreamcast Serial Extractor first appeared on Breaking Eggs And Making Omelettes.

• How to set the moov atom position when encoding video using ffmpeg in c++

  19 décembre 2017, par Zhiqiang Li

  I’m encoding some h264 video into a mp4 container using ffmpeg in c++. But the result videos place the moov atom(or metadata ?) at the end of the video file, it’s bad for internet streaming.
  So how can I set the moov atom position to the front ?