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    13 avril 2011

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  • How to stitch(concat) two transport stream with two different resolution and I-frame slices format without loosing resolution and slices information

    2 octobre 2019, par ART

    I have been trying to test a use case with steam captured from multimedia device and that didn't work. And then I have been trying to create this specific transport stream for like two days now without success, so requesting some help.

    



    I need to create transport stream with two different resolution and two different slicing format.

    



    I divided the task in following steps and in last two steps I need help.

    



    Step 1 : Download sample video with resolution : 1920x1080.
    
 I downloaded big buck bunny mp4 .

    



    Step 2 : Create transport stream with following
    
resolution : 1920x720, H264 I frame slices per frame : 1
    
I used following ffmpeg commands to do that.

    



    #Rename file to input.mp4
$ mv bbb_sunflower_1080p_30fps_normal.mp4 input.mp4
#Extract transport stream
$ ffmpeg -i input.mp4 -c copy first.ts


    



    first.ts is having 1980x720 resolution and one H264 I slice per frame.

    



    Step 3 : Create another transport stream with smaller resolution using following commands

    



    #Get mp4 with lower resolution.
$ ffmpeg -i input.mp4 -s 640x480 temp.mp4
#Extract trans port stream from mp4
$ ffmpeg -i temp.mp4 -c copy low_r.ts


    



    Step 4 : Edit(and re-encode ?) low_r.ts to have two H264 I frame slices.
I used following command to achieve it.

    



    $ x264 --slices 4 low_r.ts -o second.ts


    



    However when I play this second.ts on vlc using following command it doesn't play

    



    $ vlc ./second.ts 


    



    And using Elacard StreamEye software when I analyze the transport stream I see that it has 4 H264 I slices in only two times other than that lot of H264 p slices and H264 B slices. 
Need help here to figure out why second.ts doesn't play and why slicing is not correct.

    



    Step 5 : Combine both the transport stream without loosing resolution and slicing information.
Don't know command for this. Need help here.
I tried ffmpeg but that combines two stream with different resolution and makes one file with one resolution.

    



    Any suggestions/pointers would help me proceed. Let me also know if any of the above steps are not fine too.

    


  • avcodec/vc1 : Check for excessive resolution

    8 août 2019, par Michael Niedermayer
    avcodec/vc1 : Check for excessive resolution

    Fixes : overflow in aspect ratio calculation
    
Fixes : signed integer overflow : 393215 * 14594 cannot be represented in type 'int'
    
Fixes : 15728/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3IMAGE_fuzzer-5661588893204480
    

    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/vc1.c

  • avcodec/vqavideo : Limit resolution

    22 août 2019, par Michael Niedermayer
    avcodec/vqavideo : Limit resolution

    Fixes : Timeout (288sec -> 1ms)
    
Fixes : 16353/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VQA_fuzzer-5633402606190592
    

    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/vqavideo.c

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