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• Long video files are shortened when exported [closed]

  28 avril, par Mathilda

  I'm working on videos with a maximal length of 23h59m59s (let's say 24h). I wanted to do several modifications on these videos, including dividing them into smaller parts and converting them into images. I'm doing it with Python in the Anaconda interface.

  


  My 24-hour videos are properly read by the Windows "Films & TV" player. They are also properly read by VLC media player. However, as soon as I try to use them :

  


  

  • in editing software (Movavi) ;

  


  • on an online editing site (Video-cutter) ;

  


  • on Python (cv2 and moviepy packages) ; or

  


  • on ffmpeg

  


  


  the indicated video duration is correct only if the video is less than 13h15m22s. If it is longer than that, the indicated duration is equal to the real duration minus 13h15m22s, regardless of the loaded video's metadata (size, weight, fps, duration).

  


  I have tried with videos of different durations, different pixel sizes and weights in GB, and different fps. I had variable fps mode on the videos, so I tried to set them to fixed mode using ffmpeg, but the exported video with fixed fps still has 13h15m22s missing. For videos taken from the web (YouTube), this problem does not appear on any of the 4 tested supports, so there is no problem coming from my machine or software. The issue must be in the videos. But I don't understand what could be in the videos for it to always be 13h15m22s that are removed, regardless of the video size. Moreover, if the video was corrupted, I wouldn't be able to display it in Films & TV or VLC media player.

  


  I used ffmpeg to see if the video was corrupted :

  


  ffmpeg.exe -v error -i "/Users/myname/Desktop/myvideo.mp4" -f null >error.log 2>&1

ffmpeg.exe -v error -i "/Users/myname/Desktop/myvideo.mp4" -f null

ffprobe -show_entries stream=r_frame_rate,nb_read_frames,duration -select_streams v -count_frames -of compact=p=1:nk=1 -threads 3 -v 0


  


  And nothing appears in the output so I guess there's no error detected. I tried to repair my video with ffmpeg anyway :

  


  ffmpeg -i "/Users/myname/Desktop/myvideo.mp4" -c copy "/Users/myname/Desktop/myvideo_fixed.mp4”


  


  And there is still 13h15m22s missing.

  


  I finally tried to repair it with Untrunc, which gave me a completely black video of 55 minutes for a video supposed to last several hours. Untrunc asks for the corrupted file and a functional video file taken by the same camera as input, so I used a 3min26 file for this, assuming that since the file is less than 13h15m22s and does not appear truncated on the software, it is not corrupted. Maybe I should have taken a larger video file (a few hours for example), but I'm not sure it's going to change anything.

  


  I don't know what to do to be able to cut these videos and use them in Python without them being truncated.

  


• swscale/output : fix bilinear yuv2rgb chroma interpolation

  17 décembre 2024, par Niklas Haas

  swscale/output : fix bilinear yuv2rgb chroma interpolation
  These functions were divided into two special cases ; one assuming that
  
  uvalpha == 0, and the other assuming that uvalpha == 2048. This worked fine
  
  for simple 2x chroma upscaling but broke for e.g. yuv410p, non-centered chroma,
  
  or other special cases that involved non-aligned chroma filters.
  Fix it by instead dividing this check into two cases, a uvalpha==0 fast path
  
  and a uvalpha>0 general path. Instead of (A+B)/2 the general path now multiplies
  
  in the true uvalpha weight.
  I tried preserving the old fast path for the case of uvalpha == 2048, but this
  
  was significantly slower in practise versus having just one general path.
  
  However, we still need a uvalpha == 0 path for the unscaled case.
  Fixes : ticket #5083
  
  Signed-off-by : Niklas Haas <git@haasn.dev>
  
  Sponsored-by : Sovereign Tech Fund
  

  • [DH] libswscale/output.c

• ffmpeg -f sdl works, ffmpeg -c codec -f sdl doesn't

  3 octobre 2022, par lunadir

  running on windows
  
anyone knows why this works

  


  ffmpeg -re -i "sample_itunes.mp4" -an -f sdl2 -


  


  and this doesn't

  


  ffmpeg -re -i "sample_itunes.mp4" -an -c libx264 -f sdl2 -


  


  doesn't show any window, output is

  


  ffmpeg.exe -re -i "sample_itunes.mp4" -an -c libx264 -r 1 -f sdl2 -
ffmpeg version n4.4-79-gde1132a891-20210803 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10-win32 (GCC) 20210408
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --enable-libvmaf --enable-vulkan --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-libglslang --enable-libgme --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --disable-vaapi --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20210803
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sample_itunes.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 2036-02-06T06:28:16.000000Z
    encoder         : HandBrake 0.10.2 2015060900
  Duration: 00:01:25.50, start: 0.000000, bitrate: 245 kb/s
  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 640x480 [SAR 1:1 DAR 4:3], 116 kb/s, 10 fps, 10 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2036-02-06T06:28:16.000000Z
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2036-02-06T06:28:16.000000Z
      handler_name    : Mono
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0000025cce1ab7c0] using SAR=1/1
[libx264 @ 0000025cce1ab7c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000025cce1ab7c0] profile High, level 2.2, 4:2:0, 8-bit
[sdl,sdl2 @ 0000025cce769040] Only supports one rawvideo stream
Output #0, sdl,sdl2, to 'pipe:':
  Metadata:
    major_brand     : mp42
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.76.100
  Stream #0:0(und): Video: h264, yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 640x480 [SAR 1:1 DAR 4:3], q=2-31, 1 fps, 1 tbn (default)
    Metadata:
      creation_time   : 2036-02-06T06:28:16.000000Z
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc58.134.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
[libx264 @ 0000025cce1ab7c0] non-strictly-monotonic PTSrate=N/A speed=   0x
    Last message repeated 3 times
[libx264 @ 0000025cce1ab7c0] non-strictly-monotonic PTSrate=N/A speed=   0x
    Last message repeated 3 times
[libx264 @ 0000025cce1ab7c0] non-strictly-monotonic PTSrate=N/A speed=   0x
    Last message repeated 4 times
[libx264 @ 0000025cce1ab7c0] non-strictly-monotonic PTSrate=N/A speed=   0x
    Last message repeated 3 times
[libx264 @ 0000025cce1ab7c0] non-strictly-monotonic PTSrate=N/A speed=   0x
    Last message repeated 4 times
[libx264 @ 0000025cce1ab7c0] non-strictly-monotonic PTSrate=N/A speed=   0x
    Last message repeated 3 times
[libx264 @ 0000025cce1ab7c0] non-strictly-monotonic PTSrate=N/A speed=   0x
debug=1
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
    Last message repeated 4 times
[h264 @ 0000025ccc8fd8c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[libx264 @ 0000025cce1ab7c0] non-strictly-monotonic PTS
[h264 @ 0000025ccc8fd8c0] slice:1 F mb:0 B fix frame:15 poc:65622/65622 ref:1/1 qp:7 loop:1:0:0 weight:0 SPAT
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
    Last message repeated 8 times
...
frame=   60 fps=8.4 q=25.0 Lsize=N/A time=-00:00:00.10 bitrate=N/A speed=N/A
video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Input file #0 (sample_itunes.mp4):
  Input stream #0:0 (video): 74 packets read (22110 bytes); 61 frames decoded;
  Input stream #0:1 (audio): 1 packets read (18 bytes);
  Total: 75 packets (22128 bytes) demuxed
Output file #0 (pipe:):
  Output stream #0:0 (video): 60 frames encoded; 1 packets muxed (866 bytes);
  Total: 1 packets (866 bytes) muxed
61 frames successfully decoded, 0 decoding errors
[libx264 @ 000001d2952aa600] frame I:1     Avg QP: 7.93  size:   866
[libx264 @ 000001d2952aa600] frame P:23    Avg QP:13.48  size:   535
[libx264 @ 000001d2952aa600] frame B:36    Avg QP:10.98  size:    81
[libx264 @ 000001d2952aa600] consecutive B-frames: 16.7% 10.0%  0.0% 73.3%
[libx264 @ 000001d2952aa600] mb I  I16..4: 99.7%  0.1%  0.2%
[libx264 @ 000001d2952aa600] mb P  I16..4:  6.2%  3.1%  0.8%  P16..4:  1.4%  0.4%  0.2%  0.0%  0.0%    skip:88.1%
[libx264 @ 000001d2952aa600] mb B  I16..4:  0.2%  0.0%  0.0%  B16..8:  2.2%  0.2%  0.0%  direct: 0.1%  skip:97.2%  L0:35.9% L1:61.8% BI: 2.3%
[libx264 @ 000001d2952aa600] 8x8 transform intra:21.1% inter:48.3%
[libx264 @ 000001d2952aa600] coded y,uvDC,uvAC intra: 6.7% 1.9% 0.5% inter: 0.2% 0.1% 0.0%
[libx264 @ 000001d2952aa600] i16 v,h,dc,p: 57% 41%  2%  0%
[libx264 @ 000001d2952aa600] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 34% 51%  0%  0%  0%  0%  1%  0%
[libx264 @ 000001d2952aa600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 34% 21%  2%  2%  3%  3%  3%  2%
[libx264 @ 000001d2952aa600] i8c dc,h,v,p: 84% 15%  2%  0%
[libx264 @ 000001d2952aa600] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 000001d2952aa600] ref P L0: 84.5%  3.6%  6.3%  5.5%
[libx264 @ 000001d2952aa600] ref B L0: 78.0% 21.2%  0.9%
[libx264 @ 000001d2952aa600] ref B L1: 96.8%  3.2%
[libx264 @ 000001d2952aa600] kb/s:21.46
[AVIOContext @ 000001d29529e780] Statistics: 232272 bytes read, 2 seeks
Conversion failed!