Getting errors from FFMpeg when generating from .NET.

When I run FFMpeg from the command line, like this

ffmpeg.exe -hwaccel auto -re -i "C:\Users\Public\Videos\Sample Videos\Wildlife.wmv" -an -sn -c:v bmp -pix_fmt bgr24 -f rawvideo - > junk.bin 

It works great. However, when I create the same (minus > junk.bin ), I get this nasty "bad header" error after a few seconds of playback. What causes this? I have problems with the fact that my process blocks the channel longer than the file system, but it should be able to block the pipe endlessly without breaking the decoding. A truncated stderr is below. My code for creating things is here .

 ffmpeg version N-60761-g916a792 Copyright (c) 2000-2014 the FFmpeg developers built on Feb 19 2014 21:57:22 with gcc 4.8.2 (GCC) configuration: --target-os=mingw32 --enable-shared --enable-runtime-cpudetect libavutil 52. 65.100 / 52. 65.100 libavcodec 55. 52.102 / 55. 52.102 libavformat 55. 33.100 / 55. 33.100 libavdevice 55. 10.100 / 55. 10.100 libavfilter 4. 1.103 / 4. 1.103 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 17.104 / 0. 17.104 cygwin warning: MS-DOS style path detected: C:\Users\Public\Videos\Sample Videos\Wildlife.wmv Preferred POSIX equivalent is: /cygdrive/c/Users/Public/Videos/Sample Videos/Wildlife.wmv CYGWIN environment variable option "nodosfilewarning" turns off this warning. Consult the user guide for more details about POSIX paths: http://cygwin.com/cygwin-ug-net/using.html#using-pathnames [asf @ 0x600059480] Stream #0: not enough frames to estimate rate; consider increasing probesize Guessed Channel Layout for Input Stream #0.0 : stereo Input #0, asf, from 'C:\Users\Public\Videos\Sample Videos\Wildlife.wmv': Metadata: SfOriginalFPS : 299700 WMFSDKVersion : 11.0.6001.7000 WMFSDKNeeded : 0.0.0.0000 comment : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball title : Wildlife in HD copyright : © 2008 Microsoft Corporation IsVBR : 0 DeviceConformanceTemplate: AP@L3 Duration: 00:00:30.09, start: 0.000000, bitrate: 6977 kb/s Stream #0:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, fltp, 192 kb/s Stream #0:1(eng): Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1280x720, 5942 kb/s, 29.97 tbr, 1k tbn, 1k tbc Output #0, rawvideo, to 'pipe:': Metadata: SfOriginalFPS : 299700 WMFSDKVersion : 11.0.6001.7000 WMFSDKNeeded : 0.0.0.0000 comment : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball title : Wildlife in HD copyright : © 2008 Microsoft Corporation IsVBR : 0 DeviceConformanceTemplate: AP@L3 encoder : Lavf55.33.100 Stream #0:0(eng): Video: bmp, bgr24, 1280x720, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc Stream mapping: Stream #0:1 -> #0:0 (vc1 -> bmp) Press [q] to stop, [?] for help frame= 3 fps=0.0 q=0.0 size= 8100kB time=00:00:00.10 bitrate=662902.1kbits/s frame= 29 fps= 26 q=0.0 size= 78302kB time=00:00:00.96 bitrate=662902.3kbits/s frame= 50 fps= 30 q=0.0 size= 135003kB time=00:00:01.66 bitrate=662902.2kbits/s frame= 65 fps= 30 q=0.0 size= 175503kB time=00:00:02.16 bitrate=662902.2kbits/s frame= 80 fps= 30 q=0.0 size= 216004kB time=00:00:02.66 bitrate=662902.1kbits/s frame= 95 fps= 30 q=0.0 size= 256505kB time=00:00:03.16 bitrate=662902.1kbits/s [asf @ 0x600059480] ff asf bad header 74 at:5053733 [asf @ 0x600059480] invalid packet_length -1908511255 at:5053740 [asf @ 0x600059480] ff asf bad header d4 at:5053759 [asf @ 0x600059480] ff asf skip 55629 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5181733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5189733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5197733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5205733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5213733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5221733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5229733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5237733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5245733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5357733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5365733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5373733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5381733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5493733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5501733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5509733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5517733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5629733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5637733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5645733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5653733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5701733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5709733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5717733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5725733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5805733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5813733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5821733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5829733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5877733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5885733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5893733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5901733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5949733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5957733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5965733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] ff asf bad header 0 at:5973733 [asf @ 0x600059480] ff asf skip 7991 (unknown stream) [asf @ 0x600059480] packet_obj_size invalid Last message repeated 15 times [asf @ 0x600059480] unexpected packet_replic_size of 2 [asf @ 0x600059480] packet_obj_size invalid Last message repeated 7 times [asf @ 0x600059480] ff asf skip 2562 (unknown stream) [asf @ 0x600059480] packet_obj_size invalid Last message repeated 3 times [asf @ 0x600059480] ff asf skip 448 (unknown stream) [asf @ 0x600059480] packet_obj_size invalid Last message repeated 9 times [asf @ 0x600059480] unexpected packet_replic_size of 6 [asf @ 0x600059480] packet_obj_size invalid Last message repeated 7 times [asf @ 0x600059480] packet_frag_size is invalid (1749-9) [asf @ 0x600059480] packet_obj_size invalid Last message repeated 13 times [asf @ 0x600059480] packet_frag_size is invalid (1749-9) [asf @ 0x600059480] packet_obj_size invalid Last message repeated 24 times [asf @ 0x600059480] unexpected packet_replic_size of 6 [asf @ 0x600059480] packet_obj_size invalid Last message repeated 6 times [asf @ 0x600059480] unexpected packet_replic_size of 5 [asf @ 0x600059480] packet_obj_size invalid Last message repeated 6 times [asf @ 0x600059480] packet_frag_size is invalid (1749-9) [asf @ 0x600059480] packet_obj_size invalid [asf @ 0x600059480] packet_frag_size is invalid (1749-9) [asf @ 0x600059480] packet_obj_size invalid Last message repeated 2 times [asf @ 0x600059480] unexpected packet_replic_size of 5 [asf @ 0x600059480] packet_obj_size invalid Last message repeated 8 times [asf @ 0x600059480] unexpected packet_replic_size of 5 [asf @ 0x600059480] packet_obj_size invalid Last message repeated 39 times [asf @ 0x600059480] packet_frag_size is invalid (1749-40) 
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1 answer

Try removing the -re option. It tells ffmpeg to read from the input at its own frame rate and maybe there are some synchronization problems or bottlenecks between the hard drive, ffmpeg and your capture program output.

Since your input is stored on a local disk, there seems to be no reason not to just read the file normally.

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