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• Encoding for HLS using FFMPEG results in have a decreasing DTS

  29 décembre 2014, par Luuk D. Jansen

  I am trying to encode video for HTS live streaming, but am having problems with validating the stream using Apple Media Validator (mediastreamvalidator).
  (my test file : http://dominicansinteractive.idoms.org/media/9536/playlist.m3u8)

  The output is :

  --------------------------------------------------------------------------------
  
  http://dominicansinteractive.idoms.org/media/9536/199/prog_index.m3u8
  
  --------------------------------------------------------------------------------
  
  
  
  Playlist Validation: 
  
  
  
      OK
  
  
  
  Segments:
  
  
  
  segment_00000.ts:
  
  
  
      ERROR: (-1) Decreasing DTS were detected in track 0
  
      ERROR: (-1) Decreasing DTS were detected in track 1
  
  
  
      Average segment duration: 8.07 seconds
  
      Average segment bitrate: 2155094.67 bps
  
      Average segment structural overhead: 206525.83 bps (9.58 %)

  ---

  The second segment doesn’t seem to have the problem :

  [mpegts @ 0x1d78120] Format mpegts probed with size=2048 and score=100
  
  [mpegts @ 0x1d78120] stream=0 stream_type=1b pid=100 prog_reg_desc=
  
  [mpegts @ 0x1d78120] stream=1 stream_type=f pid=101 prog_reg_desc=
  
  [mpegts @ 0x1d78120] File position before avformat_find_stream_info() is 0
  
  [h264 @ 0x1d7c1c0] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [h264 @ 0x1d7c1c0] no picture 
  
  [h264 @ 0x1d7c1c0] Current profile doesn't provide more RBSP data in PPS, skipping
  
     Last message repeated 3 times
  
  [mpegts @ 0x1d78120] max_analyze_duration 5000000 reached at 5013333
  
  [mpegts @ 0x1d78120] File position after avformat_find_stream_info() is 0

  ---

  This seems to be a serious problem for HLS, so I am looking if there is a way to fix this.

  When looking with FFMPEG at the encoded file I get (encoder output/command at the bottom of the email) :

  ffmpeg -loglevel 99 -i encoded.ts 
  
  ffmpeg version N-37783-gdf3a96c Copyright (c) 2000-2012 the FFmpeg developers
  
   built on Jul  4 2012 07:44:52 with gcc 4.4.5
  
   configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libvpx --enable-libfaac --enable-nonfree
  
   libavutil      51. 63.100 / 51. 63.100
  
   libavcodec     54. 32.100 / 54. 32.100
  
   libavformat    54. 14.100 / 54. 14.100
  
   libavdevice    54.  0.100 / 54.  0.100
  
   libavfilter     3.  0.101 /  3.  0.101
  
   libswscale      2.  1.100 /  2.  1.100
  
   libswresample   0. 15.100 /  0. 15.100
  
   libpostproc    52.  0.100 / 52.  0.100
  
  [mpegts @ 0x2023120] Format mpegts probed with size=2048 and score=100
  
  [mpegts @ 0x2023120] stream=0 stream_type=1b pid=100 prog_reg_desc=
  
  [mpegts @ 0x2023120] stream=1 stream_type=f pid=101 prog_reg_desc=
  
  [mpegts @ 0x2023120] File position before avformat_find_stream_info() is 0
  
  [h264 @ 0x20271c0] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [h264 @ 0x20271c0] no picture 
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 143280 in que
  
     Last message repeated 6 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 158640 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 175920 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 193200 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 210480 in que
  
     Last message repeated 7 times
  
  [h264 @ 0x20271c0] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 227760 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 245040 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 262320 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 279600 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 296880 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 314160 in que
  
     Last message repeated 7 times
  
  [h264 @ 0x20271c0] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 331440 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 348720 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 366000 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 383280 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 400560 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 417840 in que
  
     Last message repeated 6 times
  
  [h264 @ 0x20271c0] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 433200 in que
  
     Last message repeated 6 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 448560 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 465840 in que
  
     Last message repeated 6 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 481200 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 498480 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 515760 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 533040 in que
  
     Last message repeated 6 times
  
  [h264 @ 0x20271c0] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [mpegts @ 0x2023120] first_dts 124080 not matching first dts 548400 in que
  
     Last message repeated 7 times
  
  [mpegts @ 0x2023120] max_analyze_duration 5000000 reached at 5000000
  
  [mpegts @ 0x2023120] File position after avformat_find_stream_info() is 0
  
  
  
  And when at the first segmented file:
  
  ffmpeg -loglevel 99 -i segment_00000.ts 
  
  ffmpeg version N-37783-gdf3a96c Copyright (c) 2000-2012 the FFmpeg developers
  
   built on Jul  4 2012 07:44:52 with gcc 4.4.5
  
   configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-libfaac --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libvpx --enable-libfaac --enable-nonfree
  
   libavutil      51. 63.100 / 51. 63.100
  
   libavcodec     54. 32.100 / 54. 32.100
  
   libavformat    54. 14.100 / 54. 14.100
  
   libavdevice    54.  0.100 / 54.  0.100
  
   libavfilter     3.  0.101 /  3.  0.101
  
   libswscale      2.  1.100 /  2.  1.100
  
   libswresample   0. 15.100 /  0. 15.100
  
   libpostproc    52.  0.100 / 52.  0.100
  
  [mpegts @ 0x1a0b120] Format mpegts probed with size=2048 and score=100
  
  [mpegts @ 0x1a0b120] stream=0 stream_type=1b pid=100 prog_reg_desc=
  
  [mpegts @ 0x1a0b120] stream=1 stream_type=f pid=101 prog_reg_desc=
  
  [mpegts @ 0x1a0b120] File position before avformat_find_stream_info() is 0
  
  [mpegts @ 0x1a0b120] Invalid timestamps stream=0, pts=1920, dts=8589929312, size=2355
  
  [mpegts @ 0x1a0b120] Invalid timestamps stream=0, pts=16320, dts=8589932912, size=3203
  
  [h264 @ 0x1a0f1c0] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [h264 @ 0x1a0f1c0] no picture 
  
  [h264 @ 0x1a0f1c0] Current profile doesn't provide more RBSP data in PPS, skipping
  
     Last message repeated 3 times
  
  [mpegts @ 0x1a0b120] max_analyze_duration 5000000 reached at 5013333
  
  [mpegts @ 0x1a0b120] File position after avformat_find_stream_info() is 0

  This problem does not occur with the BASELINE profile, but does with MAIN.

  The command I use for encoding is :

  ffmpeg, -i, [path]/test.mov, -y, -f, mpegts, -acodec, aac, -strict, -2, -ar, 48000, -b:a, 128000, -s, 960x540, -vcodec, libx264, -b:v, 1200000, -aspect, 960:540, -r, 25, -level, 3.1, -vprofile, main, -flags, +loop, -cmp, +chroma, -partitions, +parti4x4+partp8x8+partb8x8, -subq, 5, -trellis, 1, -refs, 1, -coder, 0, -me_range, 16, -keyint_min, 25, -sc_threshold, 40, -i_qfactor, 0.71, -bt, 200k, -maxrate, 1200000, -bufsize, 1200000, -rc_eq, 'blurCplx^(1-qComp)', -qcomp, 0.6, -qmin, 10, -qmax, 51, -qdiff, 4, -level, 30, -g, 30, -async, 2, [path]/encoded.ts
  
  
  
  08:40:29,843 DEBUG ~ FFMPEG(1):   libavutil      51. 63.100 / 51. 63.100
  
  08:40:29,843 DEBUG ~ FFMPEG(1):   libavcodec     54. 32.100 / 54. 32.100
  
  08:40:29,843 DEBUG ~ FFMPEG(1):   libavformat    54. 14.100 / 54. 14.100
  
  08:40:29,843 DEBUG ~ FFMPEG(1):   libavdevice    54.  0.100 / 54.  0.100
  
  08:40:29,843 DEBUG ~ FFMPEG(1):   libavfilter     3.  0.101 /  3.  0.101
  
  08:40:29,844 DEBUG ~ FFMPEG(1):   libswscale      2.  1.100 /  2.  1.100
  
  08:40:29,844 DEBUG ~ FFMPEG(1):   libswresample   0. 15.100 /  0. 15.100
  
  08:40:29,844 DEBUG ~ FFMPEG(1):   libpostproc    52.  0.100 / 52.  0.100
  
  08:40:30,033 DEBUG ~ FFMPEG(1): Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '[path]/test.mov':
  
  08:40:30,033 DEBUG ~ FFMPEG(1):   Metadata:
  
  08:40:30,033 DEBUG ~ FFMPEG(1):     major_brand     : qt  
  
  08:40:30,033 DEBUG ~ FFMPEG(1):     minor_version   : 537199360
  
  08:40:30,035 DEBUG ~ FFMPEG(1):     compatible_brands: qt  
  
  08:40:30,035 DEBUG ~ FFMPEG(1):     creation_time   : 2011-12-05 10:54:24
  
  08:40:30,036 DEBUG ~ FFMPEG(1):     timecode        : 00:00:00:00
  
  08:40:30,036 DEBUG ~ FFMPEG(1):   Duration: 00:00:24.20, start: 0.000000, bitrate: 9912 kb/s
  
  08:40:30,037 DEBUG ~ FFMPEG(1):     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080, 9777 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
  08:40:30,037 DEBUG ~ FFMPEG(1):     Metadata:
  
  08:40:30,037 DEBUG ~ FFMPEG(1):       creation_time   : 2011-12-05 10:56:28
  
  08:40:30,037 DEBUG ~ FFMPEG(1):       handler_name    : Apple Video Media Handler
  
  08:40:30,038 DEBUG ~ FFMPEG(1):     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 129 kb/s
  
  08:40:30,038 DEBUG ~ FFMPEG(1):     Metadata:
  
  08:40:30,038 DEBUG ~ FFMPEG(1):       creation_time   : 2011-12-05 10:56:28
  
  08:40:30,038 DEBUG ~ FFMPEG(1):       handler_name    : Apple Sound Media Handler
  
  08:40:30,038 DEBUG ~ FFMPEG(1):     Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
  
  08:40:30,038 DEBUG ~ FFMPEG(1):     Metadata:
  
  08:40:30,038 DEBUG ~ FFMPEG(1):       creation_time   : 2011-12-05 10:56:28
  
  08:40:30,039 DEBUG ~ FFMPEG(1):       handler_name    : Time Code Media Handler
  
  08:40:30,039 DEBUG ~ FFMPEG(1):       timecode        : 00:00:00:00
  
  08:40:30,092 DEBUG ~ FFMPEG(1): [graph 0 input from stream 0:0 @ 0x1c17180] w:1920 h:1080 pixfmt:yuv420p tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2
  
  08:40:30,092 DEBUG ~ FFMPEG(1): [output stream 0:0 @ 0x1c033a0] No opaque field provided
  
  08:40:30,110 DEBUG ~ FFMPEG(1): [scaler for output stream 0:0 @ 0x1c18040] w:1920 h:1080 fmt:yuv420p sar:0/1 -> w:960 h:540 fmt:yuv420p sar:0/1 flags:0x4
  
  08:40:30,110 DEBUG ~ FFMPEG(1): [graph 1 input from stream 0:1 @ 0x1c53440] tb:1/48000 samplefmt:s16 samplerate:48000 chlayout:0x3
  
  08:40:30,110 DEBUG ~ FFMPEG(1): -async is forwarded to lavfi similarly to -af aresample=min_comp=0.001:min_hard_comp=0.100000:max_soft_comp=0.000042.
  
  08:40:30,122 DEBUG ~ FFMPEG(1): [graph 1 aresample for input stream 0:1 @ 0x1c36880] chl:stereo fmt:s16 r:48000Hz -> chl:stereo fmt:flt r:48000Hz
  
  08:40:30,142 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] using SAR=1/1
  
  08:40:30,142 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] frame MB size (60x34) > level limit (1620)
  
  08:40:30,142 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] DPB size (4 frames, 3133440 bytes) > level limit (3 frames, 3110400 bytes)
  
  08:40:30,142 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] MB rate (51000) > level limit (40500)
  
  08:40:30,170 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] using cpu capabilities: MMX2 SSE2Slow SlowCTZ
  
  08:40:30,182 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] profile Main, level 3.0
  
  08:40:30,235 DEBUG ~ FFMPEG(1): [mpegts @ 0x1be3540] muxrate VBR, pcr every 2 pkts, sdt every 200, pat/pmt every 40 pkts
  
  08:40:30,235 DEBUG ~ FFMPEG(1): Output #0, mpegts, to '[path]/encoded.ts':
  
  08:40:30,235 DEBUG ~ FFMPEG(1):   Metadata:
  
  08:40:30,235 DEBUG ~ FFMPEG(1):     major_brand     : qt  
  
  08:40:30,235 DEBUG ~ FFMPEG(1):     minor_version   : 537199360
  
  08:40:30,235 DEBUG ~ FFMPEG(1):     compatible_brands: qt  
  
  08:40:30,235 DEBUG ~ FFMPEG(1):     timecode        : 00:00:00:00
  
  08:40:30,235 DEBUG ~ FFMPEG(1):     encoder         : Lavf54.14.100
  
  08:40:30,235 DEBUG ~ FFMPEG(1):     Stream #0:0(eng): Video: h264, yuv420p, 960x540 [SAR 1:1 DAR 16:9], q=10-51, 1200 kb/s, 90k tbn, 25 tbc
  
  08:40:30,235 DEBUG ~ FFMPEG(1):     Metadata:
  
  08:40:30,235 DEBUG ~ FFMPEG(1):       creation_time   : 2011-12-05 10:56:28
  
  08:40:30,235 DEBUG ~ FFMPEG(1):       handler_name    : Apple Video Media Handler
  
  08:40:30,236 DEBUG ~ FFMPEG(1):     Stream #0:1(eng): Audio: aac, 48000 Hz, stereo, flt, 128 kb/s
  
  08:40:30,236 DEBUG ~ FFMPEG(1):     Metadata:
  
  08:40:30,236 DEBUG ~ FFMPEG(1):       creation_time   : 2011-12-05 10:56:28
  
  08:40:30,236 DEBUG ~ FFMPEG(1):       handler_name    : Apple Sound Media Handler
  
  08:40:30,236 DEBUG ~ FFMPEG(1): Stream mapping:
  
  08:40:30,236 DEBUG ~ FFMPEG(1):   Stream #0:0 -> #0:0 (h264 -> libx264)
  
  08:40:30,236 DEBUG ~ FFMPEG(1):   Stream #0:1 -> #0:1 (aac -> aac)
  
  
  
  [...]
  
  
  
  08:40:55,398 DEBUG ~ FFMPEG(1): video:3121kB audio:359kB subtitle:0 global headers:0kB muxing overhead 11.132085%
  
  08:40:55,407 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] frame I:21    Avg QP:21.57  size: 88153
  
  08:40:55,407 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] frame P:233   Avg QP:22.74  size:  5560
  
  08:40:55,407 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] frame B:351   Avg QP:27.45  size:   141
  
  08:40:55,407 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] consecutive B-frames: 21.7%  2.0%  3.0% 73.4%
  
  08:40:55,407 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] mb I  I16..4: 54.5%  0.0% 45.5%
  
  08:40:55,422 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] mb P  I16..4:  4.7%  0.0%  1.3%  P16..4: 24.6%  3.5%  0.8%  0.0%  0.0%    skip:65.1%
  
  08:40:55,422 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] mb B  I16..4:  0.1%  0.0%  0.1%  B16..8:  0.5%  0.1%  0.0%  direct: 0.6%  skip:98.6%  L0:32.3% L1:47.1% BI:20.6%
  
  08:40:55,422 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] coded y,uvDC,uvAC intra: 59.4% 5.8% 0.4% inter: 5.4% 3.0% 0.0%
  
  08:40:55,422 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] i16 v,h,dc,p: 58% 16% 21%  4%
  
  08:40:55,422 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 21% 17%  5% 10%  7%  5%  5% 10%
  
  08:40:55,422 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] i8c dc,h,v,p: 94%  3%  3%  0%
  
  08:40:55,422 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] Weighted P-Frames: Y:13.7% UV:3.4%
  
  08:40:55,422 DEBUG ~ FFMPEG(1): [libx264 @ 0x1be3cc0] kb/s:1056.61

  For segmenting is :

  ffmpeg, -i,[path]encoded.ts, -y, -c, copy, -flags, global_header, -map, 0, -f, segment, -segment_time, 10, -segment_list, [path]/fileList.txt, -segment_format, mpegts, [path]/segment_%05d.ts]

  Any help would really be appreciated !

• Trying to concat videos from different sources with ffmpeg and get different broken results every time (partly no audio and/or fast forward video)

  30 octobre 2022, par Oliver

  I am using ffmpeg for years to create (merge and render) big video files from the (vaction) clips my sony camcorder produces. My basic workflow is to copy the mp4 files from the camcorder over to my pc, put the names in a file (file 'filename') and use the following command to create one big file that is playable by my apple tv :

  


  ffmpeg -f concat -safe 0 -i filelist.txt -c:v libx265 -preset slow -x265-params strong-intra-smoothing=0:merange=58 -crf 24 -c:a aac -b:a 320k -tag:v hvc1 output.mp4


  


  i cannot explain most of the arguments in total detail but i know that it works.
My problem occurred as i wanted to prepend some video clips recorded with an iphone to one of those files. So the first part seemed easy, the sony camcorder files have a resolution of 3840x2160 and the iphone video clips have a resolution of 1280x720 so at first i upscaled the iphone files using this command (i would have rather done in just one step but i do not know how to do that) :

  


  ffmpeg -i IMG_1182.MP4 -vf scale=3840:2160 IMG_1182_3840x2160.MP4


  


  then i just tried to add those upscaled video files to the filelist from the first command and ran the command for all clips again. Sadly that did not worked, as the resulting file contained all clips but only the iphone part had audio ! For the rest of the video the audio was missing. At this point i also did not noticed that the second part was played much faster (like played in fast forward mode). So guessed that i have to render the iphone and sony camcorder clips separately using the first command. That worked and i got two video files with perfect audio and video. My next step was to concatenate the resulting files using the following simple command :

  


  ffmpeg -f concat -safe 0 -i concatlist.txt -c copy output.mp4


  


  where concatlist contained both files.
Sadly that also did not worked. I do got a file containing both parts, this time with audio, but the video of the second part still was fast forward !

  


  I do not know what to do at this point, and i also do not understand enough to experiment with the options any more. Can someone explain to my what could be the problems here and how to solve them ?

  


• Stacking 3 gmp4-files using Avisynth and VirtualDub, results in wrong colors and distorted files

  22 juin 2015, par Frederik Amann

  I need to conduct the seemingly simple task of stacking 3 files next to each other. They are all the same : .avi Container, 320x240, 4:3, 25 fps, GeoVision Advanced MPEG-4 GEO codec.
  I installed the GeoVision codec (http://www.geovision.com.tw/english/5_8.asp# - select "other utilities"), so my system (windows media player, media player classic) can play back the files. Also, I can open and work with them in Virtual Dub. I installed AviSynth and wrote the simple script for stacking them next to each other

  h1 = AVISource("Event20150423075842001.avi")
  
  
  
  h2 = AVISource("Event20150423075842002.avi")
  
  
  
  h3 = AVISource("Event20150423075848003.avi")
  
  
  
  StackHorizontal(h1, h2, h3)

  now, when I save it as .avs and then open it using VirtualDub, I see three videos nicely put next to each other, but the colors are weird and parts of the video are upside down and everything is just ..wrong - see Screenshot http://www.linkfile.de/download-46f71057ed130f9be29510f68ce4ee71.php. First I thought it has something to do with avisynth taking the wrong codec, so i forced it on gmp4 (as you can also see in the screenshot), but the result is the same. I have now also Avisynth+ installed, as well as VirtualDubMod.
  When I open the .avs in VDMod, I get "couldn’t locate decompressor for format YV24", but it still opens the video which looks a little better though (but when I make a direct stream copy and save it, then play it back in MPC it looks exactly the same as it looked on the first screenshot). So this error points me toward something related to the colorspace.
  Now my questions :

  • How can I find out in which format my files are ? YUV24, YUV12, ..?
  • And then, how can I tell Avisynth to use a format that VirtualDubMod can deal with ?
  • Or how can I make VirtualDub deal with YUV24 ? Am I just missing a codec ? Is my train of thought even slightly on the right track, or is my problem something totally different ?

  I also found this related thread : Editing/Decoding AVI files using system-installed proprietary codecs, but using avisynth and ffmpeg, I get similar results as with VirtualDub.

  I can’t use the solution of converting all my files first and then do the stacking in a second step - because the actual files I have to work with are about 180 videos, each like 8hours long and the time it would consume would stand in no relation to my possibilities..

  I really have looked for solutions during the past week, and I think I’m close, but I sadly just don’t know enough about programming to be able to solve it on my own.. so I also want to excuse for any apparent stupidities in my explanation ;)
  I’m very thankfull for any help

  Have a good time everybody

  EDIT :
  So I have some more Info, and an example file, which I can’t link in this post -.- because I -again- have not enough reputation, very nice. I will try to comment and post the links :)

  Here is what the info() command brought me :
  Colorspace : YV24,
  FieldBased (Separated) Video : NO,
  Parity : Bottom Field First,
  Video Pitch : 320 bytes,
  Audio : NO,
  CPU detected : x87 MMX ISSE SSE4.1 SSSE3