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Sur d’autres sites (6712)

  • three ways to achieve an H264 file

    18 mars 2016, par Kindermann

    here I have three ways to get an H264 file, like all forensic scientists, I am very curious about the differences between them :

    1.

    ffmpeg -i video.mp4 video.h264

    2.

    ffmpeg -i video.mp4 -vcodec copy -an -f h264 video.h264

    3. Using the example "demuxing_decoding.c" provided on the ffmpeg official website :
    http://ffmpeg.org/doxygen/trunk/demuxing_decoding_8c-example.html

    Obviously, the first one does the transformation, and the second one does the demuxing. They render different H264 files which however have similar file sizes(in my case, it’s about say 24 MB). Suprisingly, the third one, which is also supposed to do the demuxing job, renders an H264 file with 8.4 GB ! Why ?

    What I wondered is really, how the interiors of these three methods work ?(The third one is already in source code, therefore it’s quite easy to have an insight) What about the first two commands ? What APIs are called when executing these two commands and how those APIs are called(namely, in what kind of sequences they are called) and things like that.
    One thing that is also important to me is, i have no idea how I can trace the execution routines of ffmpeg command lines. I want to see what’s going on behind ffmpeg commands in source code version. Is it possible ?

    I appreciate any comment.

  • avcodec/speexdec : Consider mode in frame size check

    26 décembre 2021, par Michael Niedermayer
    avcodec/speexdec : Consider mode in frame size check

    No speex samples with non default frame sizes are known (to me)
    
the official speexenc seems to only generate the 3 default ones.
    
Thus it may be that the fuzzer samples where the first non default
    
values encountered by the decoder.
    
Possibly the "<" should be " !="
    

    Fixes : out of array access
    
Fixes : 42821/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SPEEX_fuzzer-5640695772217344
    

    Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/speexdec.c

  • ffmpeg says : "option framerate not found"

    16 juillet 2013, par Jason

    Good afternoon.

    I've been trying to use ffmpeg to split a .mpeg into a sequence of .jpeg images. Please note that this is the inverse problem of the one specified here, but the problem I'm facing is not the same as the problem the author of that thread is facing.

    Specifically, I have tried all the following mpeg codecs available in my ffmpeg installation :

    DEV D  ffv1            FFmpeg video codec #1
    
DEVSD  ffvhuff         Huffyuv FFmpeg variant
    
DEVSDT mpeg1video      MPEG-1 video
    
D V DT mpeg1video_vdpau MPEG-1 video (VDPAU acceleration)
    
D V D  mpeg2_crystalhd MPEG-2 Video (CrystalHD acceleration)
    
DEVSDT mpeg2video      MPEG-2 video
    
DEVSDT mpeg4           MPEG-4 part 2
    
D V D  mpeg4_crystalhd MPEG-4 Part 2 (CrystalHD acceleration)
    
D V DT mpeg4_vdpau     MPEG-4 part 2 (VDPAU)
    
D VSDT mpegvideo       MPEG-1 video
    
D V DT mpegvideo_vdpau MPEG-1/2 video (VDPAU acceleration)
    
D VSDT mpegvideo_xvmc  MPEG-1/2 video XvMC (X-Video Motion Compensation)
    
DEVSD  msmpeg4         MPEG-4 part 2 Microsoft variant version 3
    
D V D  msmpeg4_crystalhd MPEG-4 Part 2 Microsoft variant version 3 (CrystalHD acceleration)
    
D VSD  msmpeg4v1       MPEG-4 part 2 Microsoft variant version 1
    
DEVSD  msmpeg4v2       MPEG-4 part 2 Microsoft variant version 2

    I've tried supplying ffmpeg with all different codecs to try to split an input .mpeg video file with 2548 frames into 2548 .jpegs, by using the -vcodec option :

    ffmpeg -r 2548 -i frames.mpeg frames_%06d.jpg -vcodec $codec

    where $codec is any codec among the ones listed above, e.g. ffv1, mpeg4, etc. However, all my efforts result in the following error :

    [NULL @ 0x1948f20] Value 4707126720094797824.000000 for parameter &#39;probesize&#39; out of range
    
[NULL @ 0x1948f20] Value 4707126720094797824.000000 for parameter &#39;analyzeduration&#39; out of range
    
[NULL @ 0x1948f20] Value 4697254411347427328.000000 for parameter &#39;indexmem&#39; out of range
    
[NULL @ 0x1948f20] Value 4703785510416416768.000000 for parameter &#39;rtbufsize&#39; out of range
    
[NULL @ 0x1948f20] Value -4616189618054758400.000000 for parameter &#39;fpsprobesize&#39; out of range
    
[NULL @ 0x1948f20] Value 4607182418800017408.000000 for parameter &#39;f_err_detect&#39; out of     range
    
[NULL @ 0x1948f20] Value 4607182418800017408.000000 for parameter &#39;err_detect&#39; out of range
    
Option framerate not found.  

    Which is weird, because I've actually specified the frame rate parameter through the -r switch. I googled a bit and it appears that this error was mentioned approximately a year and a half ago on the ffmpeg bug tracker but that information makes little sense to me because it's relevant to the devs. Curiously, if I interchange the position of the parameters and put -r after -i or even after -vcodec, the error message changes to :

    [NULL @ 0x24abf20] Value 4707126720094797824.000000 for parameter &#39;probesize&#39; out of range
    
[NULL @ 0x24abf20] Value 4707126720094797824.000000 for parameter &#39;analyzeduration&#39; out of range
    
[NULL @ 0x24abf20] Value 4697254411347427328.000000 for parameter &#39;indexmem&#39; out of range
    
[NULL @ 0x24abf20] Value 4703785510416416768.000000 for parameter &#39;rtbufsize&#39; out of range
    
[NULL @ 0x24abf20] Value -4616189618054758400.000000 for parameter &#39;fpsprobesize&#39; out of  range
    
[NULL @ 0x24abf20] Value 4607182418800017408.000000 for parameter &#39;f_err_detect&#39; out of  range
    
[NULL @ 0x24abf20] Value 4607182418800017408.000000 for parameter &#39;err_detect&#39; out of range
    
[NULL @ 0x24b23c0] Value 4686111960511545344.000000 for parameter &#39;b&#39; out of range
    
[NULL @ 0x24b23c0] Value 4683532506232782848.000000 for parameter &#39;ab&#39; out of range
    
[NULL @ 0x24b23c0] Value 4705844345939427328.000000 for parameter &#39;bt&#39; out of range
    
[NULL @ 0x24b23c0] Value 4617315517961601024.000000 for parameter &#39;me_method&#39; out of range
    
[NULL @ 0x24b23c0] Value 4622945017495814144.000000 for parameter &#39;g&#39; out of range
    
[NULL @ 0x24b23c0] Value 4611686018427387904.000000 for parameter &#39;qmin&#39; out of range
    
[NULL @ 0x24b23c0] Value 4629418941960159232.000000 for parameter &#39;qmax&#39; out of range
    
[NULL @ 0x24b23c0] Value 4613937818241073152.000000 for parameter &#39;qdiff&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;wpredp&#39; out of range
    
[NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter &#39;bug&#39; out of range
    
[NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter &#39;er&#39; out of range
    
[NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter &#39;err_detect&#39; out of range
    
[NULL @ 0x24b23c0] Value 4613937818241073152.000000 for parameter &#39;ec&#39; out of range
    
[NULL @ 0x24b23c0] Value 4620693217682128896.000000 for parameter &#39;ildctcmp&#39; out of range
    
[NULL @ 0x24b23c0] Value 4620693217682128896.000000 for parameter &#39;subq&#39; out of range
    
[NULL @ 0x24b23c0] Value 4696837138094751744.000000 for parameter &#39;ibias&#39; out of range
    
[NULL @ 0x24b23c0] Value 4696837138094751744.000000 for parameter &#39;pbias&#39; out of range
    
[NULL @ 0x24b23c0] Value 4642507528377204736.000000 for parameter &#39;lmin&#39; out of range
    
[NULL @ 0x24b23c0] Value 4660262442142531584.000000 for parameter &#39;lmax&#39; out of range
    
[NULL @ 0x24b23c0] Value 4696130710463840256.000000 for parameter &#39;flags2&#39; out of range
    
[NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter &#39;threads&#39; out of range
    
[NULL @ 0x24b23c0] Value 4620693217682128896.000000 for parameter &#39;nssew&#39; out of range
    
[NULL @ 0x24b23c0] Value -4586705114244317184.000000 for parameter &#39;profile&#39; out of range
    
[NULL @ 0x24b23c0] Value -4586705114244317184.000000 for parameter &#39;level&#39; out of range
    
[NULL @ 0x24b23c0] Value 4623507967449235456.000000 for parameter &#39;skipcmp&#39; out of range
    
[NULL @ 0x24b23c0] Value 4642507528377204736.000000 for parameter &#39;mblmin&#39; out of range
    
[NULL @ 0x24b23c0] Value 4660262442142531584.000000 for parameter &#39;mblmax&#39; out of range
    
[NULL @ 0x24b23c0] Value 4643211215818981376.000000 for parameter &#39;mepc&#39; out of range
    
[NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter &#39;bidir_refine&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;cqp&#39; out of range
    
[NULL @ 0x24b23c0] Value 4627730092099895296.000000 for parameter &#39;keyint_min&#39; out of range
    
[NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter &#39;refs&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;directpred&#39; out of range
    
[NULL @ 0x24b23c0] Value 4618441417868443648.000000 for parameter &#39;sc_factor&#39; out of range
    
[NULL @ 0x24b23c0] Value 4643211215818981376.000000 for parameter &#39;mv0_threshold&#39; out of range
    
[NULL @ 0x24b23c0] Value 4630826316843712512.000000 for parameter &#39;b_sensitivity&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;compression_level&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;min_prediction_order&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;max_prediction_order&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;prediction_order_method&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;min_partition_order&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;max_partition_order&#39; out of range
    
[NULL @ 0x24b23c0] Value 4607182418800017408.000000 for parameter &#39;ticks_per_frame&#39; out of range
    
[NULL @ 0x24b23c0] Value 4611686018427387904.000000 for parameter &#39;color_primaries&#39; out of range
    
[NULL @ 0x24b23c0] Value 4611686018427387904.000000 for parameter &#39;color_trc&#39; out of range
    
[NULL @ 0x24b23c0] Value 4611686018427387904.000000 for parameter &#39;colorspace&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;aq_mode&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;rc_lookahead&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;lpc_type&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;lpc_passes&#39; out of range
    
[NULL @ 0x24b23c0] Value 4613937818241073152.000000 for parameter &#39;thread_type&#39; out of range
    
[NULL @ 0x24b23c0] Value -4616189618054758400.000000 for parameter &#39;request_sample_fmt&#39; out of range
    
frames.mpeg: could not find codec parameters

    I'm at a loss as to what to do with this problem, and am looking for some assistance.

    Kind regards,

    Jason

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