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• ffmpeg Transcoding Stops After Few Seconds [migrated]

  15 avril 2018, par Salem F

  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 for 11 sec and stop.

  The 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. By the way, I tried with source with VLC player and it didn’t stop playing the the same source video.

  I decided 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  Las my server uses Xeon L5520 CPU which is outdated CPU specially I gout 1/4 power of V single core (if they count HT it will be 1/8 of the real core) : (

  # 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
  
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  *** 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
  
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  *** 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
  
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  *** dropping frame 16 from stream 1 at ts 14
  
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  *** dropping frame 17 from stream 1 at ts 15
  
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  *** dropping frame 17 from stream 1 at ts 16
  
  *** dropping frame 18 from stream 1 at ts 16
  
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  *** 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
  
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  *** dropping frame 22 from stream 1 at ts 20
  
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  *** dropping frame 23 from stream 1 at ts 21
  
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  *** dropping frame 26 from stream 1 at ts 24
  
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  *** dropping frame 27 from stream 1 at ts 25
  
      Last message repeated 1 times
  
  *** dropping frame 28 from stream 1 at ts 26
  
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  *** dropping frame 29 from stream 1 at ts 27
  
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  *** 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
  
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  *** dropping frame 32 from stream 1 at ts 30
  
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  *** 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
  
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  *** 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
  
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  *** dropping frame 43 from stream 1 at ts 41
  
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  *** dropping frame 44 from stream 1 at ts 43
  
  *** dropping frame 45 from stream 1 at ts 43
  
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  *** dropping frame 46 from stream 1 at ts 44
  
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  *** dropping frame 47 from stream 1 at ts 45
  
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  *** dropping frame 47 from stream 1 at ts 46
  
  *** dropping frame 48 from stream 1 at ts 46
  
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  *** dropping frame 49 from stream 1 at ts 47
  
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  *** dropping frame 50 from stream 1 at ts 48
  
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  *** dropping frame 50 from stream 1 at ts 49
  
  *** dropping frame 51 from stream 1 at ts 49
  
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  *** dropping frame 52 from stream 1 at ts 50
  
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  *** 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 Track Sizes

  1er mars 2015, par Multimedia Mike — Sega Dreamcast

  I’ve been playing around with Sega Dreamcast discs lately. Not playing the games on the DC discs, of course, just studying their structure. To review, the Sega Dreamcast game console used special optical discs named GD-ROMs, where the GD stands for “gigadisc”. They are capable of holding about 1 gigabyte of data.

  You know what’s weird about these discs ? Each one manages to actually store a gigabyte of data. Each disc has a CD portion and a GD portion. The CD portion occupies the first 45000 sectors and can be read in any standard CD drive. This area is divided between a brief data track and a brief (usually) audio track.

  The GD region starts at sector 45000. Sometimes, it’s just one humongous data track that consumes the entire GD region. More often, however, the data track is split between the first track and the last track in the region and there are 1 or more audio tracks in between. But the weird thing is, the GD region is always full. I made a study of it (click for a larger, interactive graph) :

  
  
  

  Some discs put special data or audio bonuses in the CD region for players to discover. But every disc manages to fill out the GD region. I checked up on a lot of those audio tracks that divide the GD data and they’re legitimate music tracks. So what’s the motivation ? Why would the data track be split in 2 pieces like that ?

  I eventually realized that I probably answered this question in this blog post from 4 years ago. The read speed from the outside of an optical disc is higher than the inside of the same disc. When I inspect the outer data tracks of some of these discs, sure enough, there seem to be timing-sensitive multimedia FMV files living on the outer stretches.

  One day, I’ll write a utility to take apart the split ISO-9660 filesystem offset from a weird sector.

• Turn off sw_scale conversion to planar YUV 32 byte alignment requirements

  8 novembre 2022, par flansel

  I am experiencing artifacts on the right edge of scaled and converted images when converting into planar YUV pixel formats with sw_scale. I am reasonably sure (although I can not find it anywhere in the documentation) that this is because sw_scale is using an optimization for 32 byte aligned lines, in the destination. However I would like to turn this off because I am using sw_scale for image composition, so even though the destination lines may be 32 byte aligned, the output image may not be.

  


  Example.

  


  Full output frame is 1280x720 yuv422p10le. (this is 32 byte aligned)
However into the top left corner I am scaling an image with an outwidth of 1280 / 3 = 426.
426 in this format is not 32 byte aligned, but I believe sw_scale sees that the output linesize is 32 byte aligned and overwrites the width of 426 putting garbage in the next 22 bytes of data thinking this is simply padding when in my case this is displayable area.

  


  This is why I need to actually disable this optimization or somehow trick sw_scale into believing it does not apply while keeping intact the way the program works, which is otherwise fine.

  


  I have tried adding extra padding to the destination lines so they are no longer 32 byte aligned,
this did not help as far as I can tell.

  


  Edit with code Example. Rendering omitted for ease of use.
Also here is a similar issue, unfortunately as I stated there fix will not work for my use case. https://github.com/obsproject/obs-studio/pull/2836

  


  Use the commented line of code to swap between a output width which is and isnt 32 byte aligned.

  


  #include "libswscale/swscale.h"
#include "libavutil/imgutils.h"
#include "libavutil/pixelutils.h"
#include "libavutil/pixfmt.h"
#include "libavutil/pixdesc.h"
#include 
#include 
#include 

int main(int argc, char **argv) {

/// Set up a 1280x720 window, and an item with 1/3 width and height of the window.
int window_width, window_height, item_width, item_height;
window_width = 1280;
window_height = 720;
item_width = (window_width / 3);
item_height = (window_height / 3);

int item_out_width = item_width;
/// This line sets the item width to be 32 byte aligned uncomment to see uncorrupted results
/// Note %16 because outformat is 2 bytes per component
//item_out_width -= (item_width % 16);

enum AVPixelFormat outformat = AV_PIX_FMT_YUV422P10LE;
enum AVPixelFormat informat = AV_PIX_FMT_UYVY422;
int window_lines[4] = {0};
av_image_fill_linesizes(window_lines, outformat, window_width);

uint8_t *window_planes[4] = {0};
window_planes[0] = calloc(1, window_lines[0] * window_height);
window_planes[1] = calloc(1, window_lines[1] * window_height);
window_planes[2] = calloc(1, window_lines[2] * window_height); /// Fill the window with all 0s, this is green in yuv.


int item_lines[4] = {0};
av_image_fill_linesizes(item_lines, informat, item_width);

uint8_t *item_planes[4] = {0};
item_planes[0] = malloc(item_lines[0] * item_height);
memset(item_planes[0], 100, item_lines[0] * item_height);

struct SwsContext *ctx;
ctx = sws_getContext(item_width, item_height, informat,
               item_out_width, item_height, outformat, SWS_FAST_BILINEAR, NULL, NULL, NULL);

/// Check a block in the normal region
printf("Pre scale normal region %d %d %d\n", (int)((uint16_t*)window_planes[0])[0], (int)((uint16_t*)window_planes[1])[0],
       (int)((uint16_t*)window_planes[2])[0]);

/// Check a block in the corrupted region (should be all zeros) These values should be out of the converted region
int corrupt_offset_y = (item_out_width + 3) * 2; ///(item_width + 3) * 2 bytes per component Y PLANE
int corrupt_offset_uv = (item_out_width + 3); ///(item_width + 3) * (2 bytes per component rshift 1 for horiz scaling) U and V PLANES

printf("Pre scale corrupted region %d %d %d\n", (int)(*((uint16_t*)(window_planes[0] + corrupt_offset_y))),
       (int)(*((uint16_t*)(window_planes[1] + corrupt_offset_uv))), (int)(*((uint16_t*)(window_planes[2] + corrupt_offset_uv))));
sws_scale(ctx, (const uint8_t**)item_planes, item_lines, 0, item_height,window_planes, window_lines);

/// Preform same tests after scaling
printf("Post scale normal region %d %d %d\n", (int)((uint16_t*)window_planes[0])[0], (int)((uint16_t*)window_planes[1])[0],
       (int)((uint16_t*)window_planes[2])[0]);
printf("Post scale corrupted region %d %d %d\n", (int)(*((uint16_t*)(window_planes[0] + corrupt_offset_y))),
       (int)(*((uint16_t*)(window_planes[1] + corrupt_offset_uv))), (int)(*((uint16_t*)(window_planes[2] + corrupt_offset_uv))));

return 0;


  


  }

  


  Example Output:

//No alignment
Pre scale normal region 0 0 0
Pre scale corrupted region 0 0 0
Post scale normal region 400 400 400
Post scale corrupted region 512 36865 36865

//With alignment
Pre scale normal region 0 0 0
Pre scale corrupted region 0 0 0
Post scale normal region 400 400 400
Post scale corrupted region 0 0 0