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  • avcodec/zmbv : remove the unnecessary type conversion

    12 septembre 2019, par Limin Wang
    avcodec/zmbv : remove the unnecessary type conversion

    Reviewed-by : Carl Eugen Hoyos <ceffmpeg@gmail.com>
    
Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
    • [DH] libavcodec/zmbv.c

  • avcodec/tiff : remove the unnecessary type conversion

    12 septembre 2019, par Limin Wang
    avcodec/tiff : remove the unnecessary type conversion

    Reviewed-by : Carl Eugen Hoyos <ceffmpeg@gmail.com>
    
Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
    • [DH] libavcodec/tiff.c

  • avformat/mux : Set AV_PKT_FLAG_KEY for is_intra_only packet

    21 avril 2020, par Limin Wang
    avformat/mux : Set AV_PKT_FLAG_KEY for is_intra_only packet

    The patch will make audio and subtitle packets be marked as AV_PKT_FLAG_KEY.
    

    For audio, it'll caused the audio sample to be sync sample.
    
To verify ref/fate/movenc results :
    
1. Get the movenc test data
    
[lmwang@vpn ffmpeg]$ libavformat/tests/movenc -w && mkdir -p audio_old && mv *.mp4 audio_old_
    

    After applied the patch :
    
[lmwang@vpn ffmpeg]$ make fate-movenc SAMPLES=../fate-suite
    
[lmwang@vpn ffmpeg]$ libavformat/tests/movenc -w && mkdir -p audio_key && mv *.mp4 audio_key
    

    2. Get l-smash and build boxdumper
    
https://github.com/l-smash/l-smash.git
    

    3. dump the box of crc change mp4 and diff -u
    
[lmwang@vpn ffmpeg]$ ../l-smash/cli/boxdumper —box audio_key/non-empty-moov-no-elst.mp4  > audio_key/non-empty-moov-no-elst.log
    
[lmwang@vpn ffmpeg]$ ../l-smash/cli/boxdumper —box audio_old/non-empty-moov-no-elst.mp4  > audio_old/non-empty-moov-no-elst.log
    
[lmwang@vpn ffmpeg]$ diff -u audio_key/non-empty-moov-no-elst.log audio_old/non-empty-moov-no-elst.log

    - default_sample_flags = 0x02000000

    - independent

    - sync sample
    
+                default_sample_flags = 0x01010000
    
+                    dependent
    
+                    non-sync sample
    

    4. have checked the change of crc are caused by default_sample_flags
    
non-empty-moov.mp4, non-empty-moov-elst.mp4,
    
non-empty-moov-no-elst.mp4, empty-moov.mp4, delay-moov-content.mp4,
    
empty-moov-second-frag.mp4, empty-moov-second-frag-discont.mp4,
    
delay-moov-second-frag-discont.mp4, delay-moov-elst-second-frag.mp4
    
etc
    

    5 For subtitle, it'll effect for tests/ref/fate/binsub-movtextenc and
    
tests/ref/fate/sub2video, that's expecting result for the subtitle is
    
marked as keyframe. Below is the checking result of binsub-movtextenc :
    

    [lmwang@vpn ffmpeg]$ ./ffmpeg -i ../fate-suite/sub/MovText_capability_tester.mp4 -map 0 -scodec mov_text -f mp4 -flags +bitexact -fflags +bitexact -movflags frag_keyframe+empty_moov audio_key/binsub-movtextenc.mp4
    
[lmwang@vpn ffmpeg]$ ./ffmpeg -i ../fate-suite/sub/MovText_capability_tester.mp4 -map 0 -scodec mov_text -f mp4 -flags +bitexact -fflags +bitexact -movflags frag_keyframe+empty_moov audio_old/binsub-movtextenc.mp4
    
[lmwang@vpn ffmpeg]$../l-smash/cli/boxdumper audio_key/binsub-movtextenc.mp4  > audio_key/binsub-movtextenc.log
    
[lmwang@vpn ffmpeg]$../l-smash/cli/boxdumper audio_old/binsub-movtextenc.mp4  > audio_old/binsub-movtextenc.log
    
[lmwang@vpn ffmpeg]$ diff -u audio_key/binsub-movtextenc.log audio_old/binsub-movtextenc.log
    
.... // the key difference is the flag for sync sample

    - flags = 0x000701
    
+                flags = 0x000301
    
                     data-offset-present
    
                     sample-duration-present
    
                     sample-size-present

    - sample-flags-present
    
                 sample_count = 6

    - data_offset = 188
    
+                data_offset = 164
    
                 sample[0]
    
                     sample_duration = 1570000
    
                     sample_size = 21

    - sample_flags = 0x02000000

    - independent

    - sync sample

    - degradation_priority = 0
    
                 sample[1]
    
                     sample_duration = 510000
    
                     sample_size = 2

    - sample_flags = 0x01010000

    - dependent

    - non-sync sample

    - degradation_priority = 0
    
                 sample[2]
    
                     sample_duration = 1690000
    
                     sample_size = 9

    - sample_flags = 0x02000000

    - independent

    - sync sample

    - degradation_priority = 0
    

    Suggested-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    
Suggested-by : Nicolas George <george@nsup.org>
    
Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
    • [DH] libavformat/internal.h
    • [DH] libavformat/mux.c
    • [DH] tests/ref/fate/binsub-movtextenc
    • [DH] tests/ref/fate/movenc
    • [DH] tests/ref/fate/sub2video

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